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Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution SCIE
期刊论文 | 2024 , 56 (1) , 947-957 | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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Abstract :

Al3Ni nanowires were fabricated via the selective etching of directionally solidified Al-Ni eutectic alloys. The effects of different growth rates from 2 to 1000 mu m/s on the microstructure and morphology of eutectic alloys under a temperature gradient of 10 K/cm were investigated. The mechanism of the cross-sectional morphology transformation of Al3Ni nanofibers was investigated using the dynamic undercooling degree Delta Tk\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta {T}_{\text{k}}$$\end{document}. Then, the morphologies of the Al3Ni nanowires at different growth rates and corrosion time were studied using the constant potential corrosion method. Increasing the growth rate increased the roundness of the section and decreased the fiber phase spacing and diameter. At a growth rate of 2 mu m/s, both Al and Al3Ni exhibited kinetic undercooling (Delta Tk,Al3Ni\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},{\text{Al}}_{3}\text{Ni}}$$\end{document} and Delta Tk,Al\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},\text{Al}}$$\end{document}), with values below the critical kinetic undercooling (Delta Tk,Al3Nic\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},{\text{Al}}_{3}\text{Ni}}<^>{\text{c}}$$\end{document} and Delta Tk,Alc\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},\text{Al}}<^>{\text{c}}$$\end{document}). The Al3Ni fibers underwent faceted growth and developed a thin ribbon structure. At 5 mu m/s, the kinetic undercooling of Al3Ni and Al exceeded Delta Tk,Al3Nic\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},{\text{Al}}_{3}\text{Ni}}<^>{\text{c}}$$\end{document} and Delta Tk,Alc\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},\text{Al}}<^>{\text{c}}$$\end{document}, respectively, leading to nonfaceted growth and elliptically shaped Al3Ni fibers. With prolonged corrosion time, the length of the Al3Ni nanowires increased.

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GB/T 7714 Gao, Jianjun , Zhang, Xiaheng , Liu, Yamin et al. Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution [J]. | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE , 2024 , 56 (1) : 947-957 .
MLA Gao, Jianjun et al. "Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution" . | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 56 . 1 (2024) : 947-957 .
APA Gao, Jianjun , Zhang, Xiaheng , Liu, Yamin , Huang, Chaoyang , Qin, Hongling , Yao, Ligang . Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution . | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE , 2024 , 56 (1) , 947-957 .
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Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution EI
期刊论文 | 2025 , 56 (1) , 947-957 | Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution Scopus
期刊论文 | 2024 , 56 (1) , 947-957 | Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Fabrication of assembled and welded Ag/W nanowire composite networks as electrodes for body motion monitoring and flexible heaters SCIE
期刊论文 | 2024 , 44 (2) , 1147-1159 | RARE METALS
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Abstract :

Multifunctional flexible sensors as wearable electronic systems have attracted considerable attention for mimicking human skin to sense ambient stimuli. However, sensors need to have high resolution, stability and sensitivity to realize fully biomimetic skin. Here, an assembled and welded Ag/W composite nanowire flexible electrode was prepared for body motion monitoring and flexible heaters. This Ag/W composite nanowire flexible electrode has a high transmittance of 90.1% (at 121 Omega.sq(-1) sheet resistance) and a low sheet resistance of 27 Omega.sq(-1) (at 60.1% transmittance). Although the transparency of this electrode is not high, the fluctuation in relative resistance change rate at 10% strain is only 5% after 1000 tensile cycles. It can be employed to monitor human body motions, including bending of fingers, arms, wrists, and throat action. Meanwhile, the Ag/W nanowires composite film heater achieves a steady-state temperature of up to 100 degrees C at a constant voltage of 3.5 V and an instantaneous heating rate of up to 36.5 degrees C.s(-1).

Keyword :

Ag/W nanowire Ag/W nanowire Assemble Assemble Body motion monitoring Body motion monitoring Flexible heater Flexible heater Welding Welding

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GB/T 7714 Gao, Jian-Jun , Lin, Ji-Hui , Zhang, Xia-Heng et al. Fabrication of assembled and welded Ag/W nanowire composite networks as electrodes for body motion monitoring and flexible heaters [J]. | RARE METALS , 2024 , 44 (2) : 1147-1159 .
MLA Gao, Jian-Jun et al. "Fabrication of assembled and welded Ag/W nanowire composite networks as electrodes for body motion monitoring and flexible heaters" . | RARE METALS 44 . 2 (2024) : 1147-1159 .
APA Gao, Jian-Jun , Lin, Ji-Hui , Zhang, Xia-Heng , Zhu, Lin-Peng , Qin, Hong-Ling , Yao, Li-Gang . Fabrication of assembled and welded Ag/W nanowire composite networks as electrodes for body motion monitoring and flexible heaters . | RARE METALS , 2024 , 44 (2) , 1147-1159 .
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Fabrication of assembled and welded Ag/W nanowire composite networks as electrodes for body motion monitoring and flexible heaters EI
期刊论文 | 2025 , 44 (2) , 1147-1159 | Rare Metals
Fabrication of assembled and welded Ag/W nanowire composite networks as electrodes for body motion monitoring and flexible heaters Scopus
期刊论文 | 2024 , 44 (2) , 1147-1159 | Rare Metals
Component mixing in laser cladding processes: From single-track to single-layer multi-track and multi-layer multi-track SCIE
期刊论文 | 2023 , 455 | SURFACE & COATINGS TECHNOLOGY
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Abstract :

In multi-layer multi-track laser cladding processes, the mechanical properties of the cladding layers are closely related to the microstructure and element distribution. However, the mixing process of the component cannot be predicted by the existing experimental conditions. A multi-layer multi-track laser cladding component prediction model is constructed to solve this problem. According to the multi-layer multi-track laser cladding model, the geometry of the cladding layer, and the element (Cr, Fe, and Ni) concentration distribution in the overlap zone and non-overlap zone are predicted. In addition, the effects of resistivity, dynamic viscosity, laser power, and active elements on the distribution of the cladding layer components were investigated. The results show that the uniformity of element distribution in the cladding layer is closely related to the convective mixing time and convective mixing intensity of the melt pool. Increasing the laser power, resistivity, or reducing the melt pool dynamic viscosity and sulfur concentration can increase the convective mixing time and convective mixing in-tensity of the melt layer, which helps to improve the uniformity of the melt layer group distribution. The con-centration of Cr in the cladding layer increases with the number of the cladding tracks and layers, and the Cr concentration in the non-overlap zone of the first track of the first layer is lower than that in the overlap zone and other tracks. As the number of cladding layers increases, the concentration of elements in the overlap and non-overlap zones gradually tends to be uniform except at the edge of the cladding layer. In addition, the presence of sulfur in the melt pool can change the convection form of the melt pool.

Keyword :

Component mixing Component mixing Mixing time Mixing time Multi-layer multi-track laser cladding Multi-layer multi-track laser cladding Overlap zone Overlap zone

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GB/T 7714 Li, Gaosong , Wang, Zhenya , Yao, Ligang et al. Component mixing in laser cladding processes: From single-track to single-layer multi-track and multi-layer multi-track [J]. | SURFACE & COATINGS TECHNOLOGY , 2023 , 455 .
MLA Li, Gaosong et al. "Component mixing in laser cladding processes: From single-track to single-layer multi-track and multi-layer multi-track" . | SURFACE & COATINGS TECHNOLOGY 455 (2023) .
APA Li, Gaosong , Wang, Zhenya , Yao, Ligang , Ding, Jiaxin , Gao, Jianjun . Component mixing in laser cladding processes: From single-track to single-layer multi-track and multi-layer multi-track . | SURFACE & COATINGS TECHNOLOGY , 2023 , 455 .
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Component mixing in laser cladding processes: From single-track to single-layer multi-track and multi-layer multi-track EI
期刊论文 | 2023 , 455 | Surface and Coatings Technology
Component mixing in laser cladding processes: From single-track to single-layer multi-track and multi-layer multi-track Scopus
期刊论文 | 2023 , 455 | Surface and Coatings Technology
Surface plasmon resonance of the W nanowires SCIE
期刊论文 | 2022 , 9 (12) | MATERIALS RESEARCH EXPRESS
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Abstract :

The Surface plasmon resonance (SPR) of metal materials has been widely used in photocatalysis, light sensing, biomarkers, solar cells and other fields. In this study, the surface plasmon characteristics of tungsten (W) nanowires with different diameters and lengths are analyzed using the finite element method. The thermal effect in the gap of crossed nanowires induced by the plasma resonance is studied. Results show that the resonance peak shifts red, and the resonance intensity increases with the increase in diameter. The increasing diameter results in decreasing electric field intensity and heat in the gap of the crossed tungsten (W) nanowires. The frequency of resonance peaks almost remains unchanged with increasing length. The two to six wave belly plasma modes are visible with increasing nanowire length. With exposure to incident light, the SPR in the shortened spacing results in increasing electric field intensity and the generated heat of gap between the two crossed tungsten (W) nanowires. Once the two crossed nanowires are welded, the heat production in the crossed part decreases, which indicates the self-limitation of plasma welding.

Keyword :

electric field electric field plasmon resonance plasmon resonance self-limited welding self-limited welding

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GB/T 7714 Zhu, Linpeng , Gao, Jianjun , Gu, Wei et al. Surface plasmon resonance of the W nanowires [J]. | MATERIALS RESEARCH EXPRESS , 2022 , 9 (12) .
MLA Zhu, Linpeng et al. "Surface plasmon resonance of the W nanowires" . | MATERIALS RESEARCH EXPRESS 9 . 12 (2022) .
APA Zhu, Linpeng , Gao, Jianjun , Gu, Wei , Zhang, Fenfei , Geng, Haibin , Xu, Jiaxing et al. Surface plasmon resonance of the W nanowires . | MATERIALS RESEARCH EXPRESS , 2022 , 9 (12) .
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Surface plasmon resonance of the W nanowires EI
期刊论文 | 2022 , 9 (12) | Materials Research Express
Cu Nanowires and Nanoporous Ag Matrix Fabricated through Directional Solidification and Selective Dissolution of Ag-Cu Eutectic Alloys SCIE
期刊论文 | 2022 , 15 (22) | MATERIALS
WoS CC Cited Count: 1
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Abstract :

Cu nanowires and a nanoporous Ag matrix were fabricated through directional solidification and selective dissolution of Ag-Cu eutectic alloys. Ag-39.9at.%Cu eutectic alloys were directionally solidified at growth rates of 14, 25, and 34 mu m/s at a temperature gradient of 10 K/cm. The Cu phase in the Ag matrix gradually changed from lamellar to fibrous with an increase in the growth rate. The Ag matrix phase was selectively dissolved, and Cu nanowires of 300-600 nm in diameter and tens of microns in length were prepared in 0.1 M borate buffer with a pH of 9.18 at a constant potential of 0.7 V (vs. SCE). The nanoporous Ag matrix was fabricated through selective dissolution of Cu fiber phase in 0.1 M acetate buffer with a pH of 6.0 at a constant potential of 0.5 V (vs. SCE). The diameter of Ag pores decreased with increasing growth rate. The diameter and depth of Ag pores increased when corrosion time was extended. The depth of the pores was 30 mu m after 12 h.

Keyword :

Ag-Cu eutectic alloys Ag-Cu eutectic alloys Cu nanowires Cu nanowires directional solidification directional solidification nanoporous Ag matrix nanoporous Ag matrix selective dissolution selective dissolution

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GB/T 7714 Xu, Jiaxing , Gao, Jianjun , Qin, Hongling et al. Cu Nanowires and Nanoporous Ag Matrix Fabricated through Directional Solidification and Selective Dissolution of Ag-Cu Eutectic Alloys [J]. | MATERIALS , 2022 , 15 (22) .
MLA Xu, Jiaxing et al. "Cu Nanowires and Nanoporous Ag Matrix Fabricated through Directional Solidification and Selective Dissolution of Ag-Cu Eutectic Alloys" . | MATERIALS 15 . 22 (2022) .
APA Xu, Jiaxing , Gao, Jianjun , Qin, Hongling , Liu, Zhiyang , Zhu, Linpeng , Geng, Haibin et al. Cu Nanowires and Nanoporous Ag Matrix Fabricated through Directional Solidification and Selective Dissolution of Ag-Cu Eutectic Alloys . | MATERIALS , 2022 , 15 (22) .
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Cu Nanowires and Nanoporous Ag Matrix Fabricated through Directional Solidification and Selective Dissolution of Ag–Cu Eutectic Alloys EI
期刊论文 | 2022 , 15 (22) | Materials
Cu Nanowires and Nanoporous Ag Matrix Fabricated through Directional Solidification and Selective Dissolution of Ag–Cu Eutectic Alloys Scopus
期刊论文 | 2022 , 15 (22) | Materials
Selective Etching of Sr-Modified and Directionally Solidified Industrial Al-Si Eutectic Alloys for Fabricating Fibrous Eutectic Si SCIE
期刊论文 | 2021 , 11 (12) | METALS
WoS CC Cited Count: 1
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Abstract :

In order to fabricate fibrous eutectic Si, the selective etching of industrial Al-Si eutectic alloys directionally solidified at different growth rates and modified by different amounts of Sr was studied. Flake eutectic and fibrous Si were obtained by selective etching of non-modified, Sr-modified or directionally solidified Al-Si eutectic alloys. The optimal amount of Sr for fabricating branching eutectic Si was 0.04-0.07%. Through directional solidification with a high enough growth rate (more than 200 mu m/s), lamellar eutectic Si transforms to fibrous eutectic Si for use in non-modified Al-Si eutectic alloys. The potentiodynamic polarization and cyclic voltammetry methods were used to test the corrosion behavior of non-modified and Sr-modified Al-Si eutectic alloys. With a constant potential of 0.5 V in HCl solution, non-modified Al-Si eutectic alloys displayed initial pitting corrosion and subsequent spalling corrosion, and 0.04% Sr-modified samples displayed uniform pitting corrosion. Compared with non-modified Al-Si eutectic alloys, Sr-modified samples displayed better corrosion resistance with lower current density and shallower pit depth during the same etching conditions.

Keyword :

directional solidification directional solidification eutectic Si eutectic Si selective etching selective etching Sr modification Sr modification

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GB/T 7714 Gao, Jianjun , Gu, Wei , Zhang, Fenfei et al. Selective Etching of Sr-Modified and Directionally Solidified Industrial Al-Si Eutectic Alloys for Fabricating Fibrous Eutectic Si [J]. | METALS , 2021 , 11 (12) .
MLA Gao, Jianjun et al. "Selective Etching of Sr-Modified and Directionally Solidified Industrial Al-Si Eutectic Alloys for Fabricating Fibrous Eutectic Si" . | METALS 11 . 12 (2021) .
APA Gao, Jianjun , Gu, Wei , Zhang, Fenfei , Geng, Haibin , Zhong, Jianhua , Yao, Ligang et al. Selective Etching of Sr-Modified and Directionally Solidified Industrial Al-Si Eutectic Alloys for Fabricating Fibrous Eutectic Si . | METALS , 2021 , 11 (12) .
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Morphologies, Young's Modulus and Resistivity of High Aspect Ratio Tungsten Nanowires SCIE
期刊论文 | 2020 , 13 (17) | MATERIALS
WoS CC Cited Count: 4
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Abstract :

High aspect ratio tungsten nanowires have been prepared by selective dissolution of Nickel-aluminum-tungsten (NiAl-W) alloys which were directionally solidified at growth rates varying from 2 to 25 mu m/s with a temperature gradient of 300 K center dot cm(-1). Young's modulus and electrical resistivity of tungsten nanowires were measured by metallic mask template method. The results show that the tungsten nanowires with uniform diameter and high aspect ratio are well aligned. The length of tungsten nanowires increases with prolongation of etching time, and their length reaches 300 mu m at 14 h. Young's modulus of tungsten nanowires is estimated by Hertz and Sneddon models. The Sneddon model is proper for estimating the Young's modulus, and the value of calculating Young's modulus are 260-460 GPa which approach the value of bulk tungsten. The resistivity of tungsten nanowires is measured and fitted with Fuchs-Sondheimer (FS) + Mayadas-Shatzkes (MS) model. The fitting results show that the specific resistivity of W nanowires is a litter bigger than the bulk W, and its value decreases with decreasing diameter.

Keyword :

resistivity resistivity selective etching selective etching tungsten nanowires tungsten nanowires young's modulus young's modulus

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GB/T 7714 Gao, Jianjun , Luo, Jian , Geng, Haibin et al. Morphologies, Young's Modulus and Resistivity of High Aspect Ratio Tungsten Nanowires [J]. | MATERIALS , 2020 , 13 (17) .
MLA Gao, Jianjun et al. "Morphologies, Young's Modulus and Resistivity of High Aspect Ratio Tungsten Nanowires" . | MATERIALS 13 . 17 (2020) .
APA Gao, Jianjun , Luo, Jian , Geng, Haibin , Cui, Kai , Zhao, Zhilong , Liu, Lin . Morphologies, Young's Modulus and Resistivity of High Aspect Ratio Tungsten Nanowires . | MATERIALS , 2020 , 13 (17) .
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Morphologies, young's modulus and resistivity of high aspect ratio tungsten nanowires EI
期刊论文 | 2020 , 13 (17) | Materials
Morphologies, young's modulus and resistivity of high aspect ratio tungsten nanowires Scopus
期刊论文 | 2020 , 13 (17) | Materials
Study on microstructure and mechanical properties of Ni60+WC/Ni35/AISI1040 functional surface gradient structure of remanufacturing chute plate for the mining scraper by a low cost high power CO(2)laser cladding technique SCIE
期刊论文 | 2020 , 7 (8) | MATERIALS RESEARCH EXPRESS
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Abstract :

CO(2)laser cladding is a type of green remanufacturing technology, which is of many technical advantages in repairing and remanufacturing industry, especially for some large-scale key mining equipment or parts due to its characteristics of high quality, high efficiency and environmental protection (e.g. energy and material saving). In this paper, the chute plate of coal mining scraper is fixed and remanufactured by CO(2)laser cladding technique. Ni60, WC, Ni35, IG55 and other composite powders are selected to design and build the gradient functional structure for chute plate in order to improve the reproduced lifetime. A lot of high power low cost CO(2)laser cladding tests are carried out on the matrix material (AISI 1040 steel plate) of old attrite chute plate. The optical microscope, SEM, XRD, microhardness test and wear experiment are adopted to analyze the relationships among the laser cladding process, the overlaying composite material, gradient functional structure and mechanical properties of the remanufacturing scraper's chute plate. The research results show that laser power and scanning speed are the dominant cladding process parameters, which have a significant influence on the geometric dimension (including width and height), dilution rate and hardness of the deposited layer. These composite powders (especially including the rare earth metals) are the key factor to form the gradient functional structure. The laser cladding Ni60 + WC/Ni35/AISI1040 composite gradient functional structure has a reasonable toughness and strength of the transition layer structure, and a high hardness and wear-resistant surface functional layer, so the fixed and remanufactured product has formed good ductile plasticity and wear resistance properties as a result of the gradient functional structure. The unique Ni60 + WC/Ni35/AISI1040 gradient functional structure makes sure that the chute plate of mining scraper has excellent comprehensive performance, which is satisfied with the service requirements of mechanical parts or equipment in the harsh working environment of the mining industry. This research work provides technological guidance for the fix and remanufacturing chute plate, and achieves the goal of low cost, high efficiency and long life reproduced chute plate of mining scraper.

Keyword :

chute plate of mining scraper chute plate of mining scraper gradient functional structure gradient functional structure laser cladding laser cladding microstructure and mechanical properties microstructure and mechanical properties remanufacturing process remanufacturing process

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GB/T 7714 Luo, J. , Gao, J. J. , Gou, S. W. et al. Study on microstructure and mechanical properties of Ni60+WC/Ni35/AISI1040 functional surface gradient structure of remanufacturing chute plate for the mining scraper by a low cost high power CO(2)laser cladding technique [J]. | MATERIALS RESEARCH EXPRESS , 2020 , 7 (8) .
MLA Luo, J. et al. "Study on microstructure and mechanical properties of Ni60+WC/Ni35/AISI1040 functional surface gradient structure of remanufacturing chute plate for the mining scraper by a low cost high power CO(2)laser cladding technique" . | MATERIALS RESEARCH EXPRESS 7 . 8 (2020) .
APA Luo, J. , Gao, J. J. , Gou, S. W. , Li, Y. L. , Lin, H. X. , Wu, X. R. et al. Study on microstructure and mechanical properties of Ni60+WC/Ni35/AISI1040 functional surface gradient structure of remanufacturing chute plate for the mining scraper by a low cost high power CO(2)laser cladding technique . | MATERIALS RESEARCH EXPRESS , 2020 , 7 (8) .
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Study on microstructure and mechanical properties of Ni60 + WC/Ni35/AISI1040 functional surface gradient structure of remanufacturing chute plate for the mining scraper by a low cost high power CO2laser cladding technique Scopus
期刊论文 | 2020 , 7 (8) | Materials Research Express
Study on microstructure and mechanical properties of Ni60 + WC/Ni35/AISI1040 functional surface gradient structure of remanufacturing chute plate for the mining scraper by a low cost high power CO2laser cladding technique EI
期刊论文 | 2020 , 7 (8) | Materials Research Express
Microstructure and tensile properties of the different thickness ASSAPH440 high strength steel/DC52D+ZF45 galvanized cold rolled sheet dissimilar metal welding joint by CO(2)laser welding for automobile manufacturing SCIE
期刊论文 | 2020 , 7 (6) | MATERIALS RESEARCH EXPRESS
WoS CC Cited Count: 1
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Abstract :

In order to adapt to the development trend of a lightweight automobile and meet the safety requirements of key automotive parts, it is necessary to study the relationship between microstructure and mechanical properties of the dissimilar and different thickness materials welded joint. In this work, a dissimilar welded joint of high strength vehicle steel ASSAPH440 with 2.0 mm thickness/galvanized cold rolled sheet DC52D+ZF45 with 2.6 mm thickness formed by CO(2)laser welding was studied. The microstructure of the welded joint was analyzed by metallographic structure and mechanical properties were discussed in terms of their tensile strength and microhardness. The results indicated that a high-quality welded joint with an average tensile strength of 643 MPa and an elongation of 22.7% was obtained at a welding speed of 30 mm s(-1)and the laser power of 2200 w in CO(2)laser welding, the tensile strength of laser welded joint was more than that of the both based metals. The center of the welding seam was composed of slender lath martensite with a few small white pieces of ferrite. The microstructure of the Heat Affected Zone (HAZ) on the DC52D+ZF45 side was smaller than that of the HAZ on the ASSAPH440 side, and its mechanical properties were superior. The highest microhardness was obtained at the center of the cross section of the welding seam, and the microhardness of the welding seam on the DC52D+ZF45 side was higher than that of the welding seam on the ASSAPH440 side. The tensile fracture appeared at the base metal of DC52D+ZF45 steel as a result of the strength of ASSAPH440 was more than that of DC52D+ZF45. The performance of the laser welded joint met the technical requirements of automobile manufacturing engineering.

Keyword :

CO(2)laser welding CO(2)laser welding different thickness different thickness dissimilar metals dissimilar metals mechanical properties mechanical properties microstructure microstructure

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GB/T 7714 Luo, J. , Gao, J. J. , Lin, H. X. et al. Microstructure and tensile properties of the different thickness ASSAPH440 high strength steel/DC52D+ZF45 galvanized cold rolled sheet dissimilar metal welding joint by CO(2)laser welding for automobile manufacturing [J]. | MATERIALS RESEARCH EXPRESS , 2020 , 7 (6) .
MLA Luo, J. et al. "Microstructure and tensile properties of the different thickness ASSAPH440 high strength steel/DC52D+ZF45 galvanized cold rolled sheet dissimilar metal welding joint by CO(2)laser welding for automobile manufacturing" . | MATERIALS RESEARCH EXPRESS 7 . 6 (2020) .
APA Luo, J. , Gao, J. J. , Lin, H. X. , Fan, Y. H. , Ran, Y. , Yin, H. et al. Microstructure and tensile properties of the different thickness ASSAPH440 high strength steel/DC52D+ZF45 galvanized cold rolled sheet dissimilar metal welding joint by CO(2)laser welding for automobile manufacturing . | MATERIALS RESEARCH EXPRESS , 2020 , 7 (6) .
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Microstructure and tensile properties of the different thickness ASSAPH440 high strength steel/DC52D+ZF45 galvanized cold rolled sheet dissimilar metal welding joint by CO2 laser welding for automobile manufacturing EI
期刊论文 | 2020 , 7 (6) | Materials Research Express
Microstructure and tensile properties of the different thickness ASSAPH440 high strength steel/DC52D+ZF45 galvanized cold rolled sheet dissimilar metal welding joint by CO2 laser welding for automobile manufacturing Scopus
期刊论文 | 2020 , 7 (6) | Materials Research Express
Analysis on the characteristics of pulsed electromagnetic force and the fluctuation behavior of molten metal free surface under pulsed magnetic field SCIE
期刊论文 | 2020 , 7 (5) | MATERIALS RESEARCH EXPRESS
WoS CC Cited Count: 1
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Abstract :

Aself-made line laser liquid level measurement system was used to measure the fluctuation of molten metal free surface under pulsed magnetic field. The electromagnetic characteristics of pulsed electromagnetic force were mathematically analyzed. Results showed that the electromagnetic force presents oscillatory attenuation during a single pulse period. The electromagnetic force was composed of turning force f turn and non-turning force f. nonturn The direction of f turn was always consistent with the melt circumferential direction, which turned the f nonturn consisted of electromagnetic pull and push forces, which caused the melt to oscillate. Under the pulsed magnetic field, the free surface formed a meniscus with a high middle, low side structure. With increased pulsed field intensity, the center surface of molten melt had an oscillation of +/- 3.52mmat 0.187 T. The wave power density had only two spectral peaks (at 0.60 and 3.36 Hz) without a magnetic field. Under pulsed magnetic field, four spectral peaks were found at 0.40, 3.00, 6.50 and 13.00 Hz.

Keyword :

molten metal fluctuation molten metal fluctuation pulsed electromagnetic force pulsed electromagnetic force pulsed magnetic field pulsed magnetic field

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GB/T 7714 Wu, Xinjiang , Liu, Ruirui , Gao, Jianjun et al. Analysis on the characteristics of pulsed electromagnetic force and the fluctuation behavior of molten metal free surface under pulsed magnetic field [J]. | MATERIALS RESEARCH EXPRESS , 2020 , 7 (5) .
MLA Wu, Xinjiang et al. "Analysis on the characteristics of pulsed electromagnetic force and the fluctuation behavior of molten metal free surface under pulsed magnetic field" . | MATERIALS RESEARCH EXPRESS 7 . 5 (2020) .
APA Wu, Xinjiang , Liu, Ruirui , Gao, Jianjun , Luo, Jian , Geng, Haibin . Analysis on the characteristics of pulsed electromagnetic force and the fluctuation behavior of molten metal free surface under pulsed magnetic field . | MATERIALS RESEARCH EXPRESS , 2020 , 7 (5) .
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Analysis on the characteristics of pulsed electromagnetic force and the fluctuation behavior of molten metal free surface under pulsed magnetic field EI
期刊论文 | 2020 , 7 (5) | Materials Research Express
Analysis on the characteristics of pulsed electromagnetic force and the fluctuation behavior of molten metal free surface under pulsed magnetic field Scopus
期刊论文 | 2020 , 7 (5) | Materials Research Express
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