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学者姓名：高建军
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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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为分析联合收割机底盘机架的振动特性，使用UG NX12.0建立机架的三维模型，使用NX Nastran进行理论模态分析，计算前12阶振型的固有频率和云图，得出机架最大变形部位。通过对底盘机架进行模态试验，验证理论分析的准确性。计算外部激励频率范围，对比分析机架固有频率与主要外部激励频率，对机架进行结构优化，有效避免机架共振。研究结果表明：在机架质量增加7.9%的前提下，机架的第9阶和第10阶固有频率分别降低到81.439 Hz和84.803 Hz,有效避开了发动机工作激振频率86.667 Hz。对优化的机架进行静力学分析，其结构强度满足设计要求。
Keyword ：
固有频率 固有频率 底盘机架 底盘机架 模态分析 模态分析 结构优化 结构优化 联合收割机 联合收割机
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| GB/T 7714 | 高建军 , 刘志扬 , 顾伟 et al. 谷物联合收割机底盘机架模态分析与优化 [J]. | 机械设计与研究 , 2023 , 39 (03) : 199-205 . |
| MLA | 高建军 et al. "谷物联合收割机底盘机架模态分析与优化" . | 机械设计与研究 39 . 03 (2023) : 199-205 . |
| APA | 高建军 , 刘志扬 , 顾伟 , 张奋飞 , 朱霖鹏 , 徐佳星 . 谷物联合收割机底盘机架模态分析与优化 . | 机械设计与研究 , 2023 , 39 (03) , 199-205 . |
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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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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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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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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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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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Wire and arc additive manufacturing of stiffened ribs for fabricating large integral panel components holds promise for lightweight construction, but stress and warpage remain intractable problems. This work take stress in central lines as a research focus, theoretically analyzes stress evolution along central lines without a stress distribution hypothesis, then further develops prediction models of warpage, based on general beam theory. The stress and warpage models are then verified by experimental results. The results showed that below 40 layers, the stress in the top layer increased rapidly to the yield strength. Following the continuous deposition of up to 100 layers, stress increased slowly, then gradually trended to a constant level. After 100 layers of deposition, the top-layer-plane stress in the 10th layer decreased from 68 MPa to 5 MPa, and the plane stress in the 90th layer decreased from 296 MPa to 245 MPa. Post-heating treatment effect was important for temperature uniformity. The largest warpage (3.48 mm) happened when stiffener was designed as 30 layers.
Keyword ：
integral panel integral panel stress evolution stress evolution theoretical model theoretical model warpage warpage wire and arc additive manufacturing wire and arc additive manufacturing
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| GB/T 7714 | Geng, Haibin , Li, Jinglong , Gao, Jianjun et al. Theoretical Model of Residual Stress and Warpage for Wire and Arc Additive Manufacturing Stiffened Panels [J]. | METALS , 2020 , 10 (5) . |
| MLA | Geng, Haibin et al. "Theoretical Model of Residual Stress and Warpage for Wire and Arc Additive Manufacturing Stiffened Panels" . | METALS 10 . 5 (2020) . |
| APA | Geng, Haibin , Li, Jinglong , Gao, Jianjun , Lin, Xin . Theoretical Model of Residual Stress and Warpage for Wire and Arc Additive Manufacturing Stiffened Panels . | METALS , 2020 , 10 (5) . |
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In friction stir welding (FSW), many defects (such as kissing bond, incomplete penetration, and weak connection) easily occur at the root of the welded joint. Based on the Levy-Mises yield criterion of the Zener-Hollomon thermoplastic constitutive equation, a 3D thermal-mechanical coupled finite element model was established. The material flow behavior and the stress field at the root area of a 6 mm thick 2024-T3 aluminum alloy FSW joint were studied. The influence of pin length on the root flaw was investigated, and the formation mechanism of the "S line" defects and non-penetration defects were revealed. The research results showed that the "S line" defect forms near the bottom surface of the pin owing to the insufficiently mixed material from the advancing side (AS) and retreating side (RS) near the weld center. The non-penetration defect forms near the bottom surface of the workpiece owing to the insufficient driving force to make the material flow through the weld center. With the continual increase of pin length, the size of the "S line" defect and non-penetration defect reduces, and finally, the defect-free welded joint can be obtained with an optimized suitable length of the pin in this case.
Keyword ：
friction stir welding friction stir welding Incomplete penetration Incomplete penetration metal flow behavior metal flow behavior pin length pin length root flaw root flaw weak connection weak connection welding seam root welding seam root
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| GB/T 7714 | Luo, Jian , Wang, Jiafa , Lin, Hongxin et al. Study on the Relationship between Root Metal Flow Behavior and Root Flaw Formation of a 2024 Aluminum Alloy Joint in Friction Stir Welding by a Multiphysics Field Model [J]. | METALS , 2020 , 10 (7) . |
| MLA | Luo, Jian et al. "Study on the Relationship between Root Metal Flow Behavior and Root Flaw Formation of a 2024 Aluminum Alloy Joint in Friction Stir Welding by a Multiphysics Field Model" . | METALS 10 . 7 (2020) . |
| APA | Luo, Jian , Wang, Jiafa , Lin, Hongxin , Yuan, Lei , Gao, Jianjun , Geng, Haibin . Study on the Relationship between Root Metal Flow Behavior and Root Flaw Formation of a 2024 Aluminum Alloy Joint in Friction Stir Welding by a Multiphysics Field Model . | METALS , 2020 , 10 (7) . |
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Molten pool uniformity is a prerequisite for wire and arc additive manufacture to achieve a uniform surface appearance. The thermal boundary is a key indicator to evaluate the thermodynamic state of the molten pool. This paper focuses on thermal analysis through finite element simulation and characterizes the thermal evolution of a molten pool during bottom-up deposition. The peak temperature of the substrate plate increases from 375.7 degrees C to 623.1 degrees C when peak current increases from 120 A to 180 A. The temperature gradient decreases from 40 degrees C/mm to 30 degrees C/mm. Weld speed increases from 0.15 m/min to 0.25 m/min; the temperature gradient is kept at about 30 degrees C/mm. Dimensionless thermal conductivity, Ge number, is proposed and defined as the criteria to estimate layer size variation. ForI(p)= 140 A, the average value of the Ge number is 87.7, and it shows the best numerical stability. Dimensionless thermal conductivity, Ge, is proposed and defined as the criteria to estimate the occurrence of layer size variation. Prolonging heating time and increasing cycle frequency, Ge number shows favorable stability during bottom-up deposition. The experimental results are consistent with analytical conclusions, which proves the validity of the Ge number as an indicator of deposition stability.
Keyword ：
nondimensional thermal conductivity nondimensional thermal conductivity temperature field temperature field temperature gradient temperature gradient thermal boundary evolution thermal boundary evolution wire and arc additive manufacturing wire and arc additive manufacturing
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| GB/T 7714 | Geng, Haibin , Luo, Jian , Li, Jinglong et al. Thermal Boundary Evolution of Molten Pool During Wire and Arc Additive Manufacturing of Single Walls of 5A06 Aluminum Alloy [J]. | METALS , 2020 , 10 (7) . |
| MLA | Geng, Haibin et al. "Thermal Boundary Evolution of Molten Pool During Wire and Arc Additive Manufacturing of Single Walls of 5A06 Aluminum Alloy" . | METALS 10 . 7 (2020) . |
| APA | Geng, Haibin , Luo, Jian , Li, Jinglong , Gao, Jianjun , Lin, Xin . Thermal Boundary Evolution of Molten Pool During Wire and Arc Additive Manufacturing of Single Walls of 5A06 Aluminum Alloy . | METALS , 2020 , 10 (7) . |
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