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学者姓名:赖福强
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This study addresses the enhancement of thermal stability of zinc alloys, which commonly experience reduced mechanical performance beyond 100 degrees C. The 304 stainless steel wires (SSWs) were utilized to fabricate a 3D porous metal rubber (MR) skeleton, facilitating the infusion of molten zinc alloys (ZA8) via squeeze casting to prepare MR/ZA8 composites. The impact of varying SSW volume fractions on the static compression creep (SCC) behavior of the MR/ZA8 composites at 250 degrees C was investigated, while exploring their SCC failure mechanisms. Energy dispersive spectrometer was used to analyze the MR/ZA8 composites both before and after the creep experiments. Findings revealed that in comparison to ZA8, MR/ZA8 composites exhibited notably lower SCC strain, diminishing with the increased SSW volume fraction. Under the applied stresses of 12 MPa, 17 MPa and 20.4 MPa, the steady-state SCC rate of MR/ZA8 composites experienced a reduction of 1 order of magnitude compared to ZA8. The apparent stress exponent n value ranged from 3.37 to 4.84, indicating a SCC mechanism dominated by dislocation climb within the two materials. The elemental composition of the MR/ZA8 composites remained largely unchanged, and the MR skeleton in the MR/ZA8 did not undergo oxidation.
Keyword :
Failure mechanism Failure mechanism Metal rubber skeleton Metal rubber skeleton Squeeze casting Squeeze casting Static compression creep behavior Static compression creep behavior Zinc alloy matrix composite Zinc alloy matrix composite
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GB/T 7714 | Lai, Fuqiang , Zhou, Ziang , Hu, Anqiong et al. Static compression creep behavior of MR/ZA8 composite at elevated temperature [J]. | MATERIALS TODAY COMMUNICATIONS , 2025 , 42 . |
MLA | Lai, Fuqiang et al. "Static compression creep behavior of MR/ZA8 composite at elevated temperature" . | MATERIALS TODAY COMMUNICATIONS 42 (2025) . |
APA | Lai, Fuqiang , Zhou, Ziang , Hu, Anqiong , Gao, Guilin , Wu, Yiwan , Zhang, Guosen et al. Static compression creep behavior of MR/ZA8 composite at elevated temperature . | MATERIALS TODAY COMMUNICATIONS , 2025 , 42 . |
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Textured surfaces have been widely applied in the field of engineering for friction reduction, but research on the effects of different texture design parameters on the wear and fatigue resistance of bearing steel remains insufficiently explored. In order to improve the anti-wear and anti-fatigue performance and prolong the service life of bearing steel, surface texturing technology was applied to fabricate textured GCr15 bearing steel materials. In this work, micro-groove surface texture was designed by hydrodynamic theory, then, it was fabricated on the GCr15 bearing steel surface using nanosecond laser processing. The depths (15 mu m, 30 mu m), spacing (100 mu m, 200 mu m, 300 mu m), and friction angles (30 degrees, 60 degrees, 90 degrees) of micro groove were selected as the primary parameters for micro groove fabrication. The friction and wear tests and rolling contact fatigue (RCF) tests were conducted to investigate the lubrication tribological properties. The results indicated that micro-groove spacing of 300 mu m significantly reduces the coefficient of friction (CoF), depth of 30 mu m produces a higher hydrodynamic pressure, and friction angle of 60 degrees has a lower CoF value. Compared to the untextured samples, the RCF life of micro-groove surface texture sample is improved, and the median RCF life is increased by 36.5%. And it could be attributed to the dispersion effect of micro-groove surface texture on stress concentration. The findings indicate that a well-designed micro-groove structure can enhance the fluid dynamic pressure lubrication effect to a certain degree. In comparison to smooth surface specimens, those with micro-grooves exhibit reduced friction.
Keyword :
anti-friction mechanism anti-friction mechanism hydrodynamic lubrication effect hydrodynamic lubrication effect lubrication tribological properties lubrication tribological properties Micro-groove surface texture Micro-groove surface texture rolling contact fatigue rolling contact fatigue
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GB/T 7714 | Lai, Fuqiang , Cao, Changsheng , Chen, Huanghuang et al. Influence of micro-groove surface texture on the lubrication tribological properties of GCr15 bearing steel [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY , 2025 . |
MLA | Lai, Fuqiang et al. "Influence of micro-groove surface texture on the lubrication tribological properties of GCr15 bearing steel" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY (2025) . |
APA | Lai, Fuqiang , Cao, Changsheng , Chen, Huanghuang , Lin, Chang , Song, Chenfei , Lei, Kangjie et al. Influence of micro-groove surface texture on the lubrication tribological properties of GCr15 bearing steel . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY , 2025 . |
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This study presents a new surface strengthening technique (cold upsetting manufacturing process) for engine valve seating face (VSF). The properties of the Ni30 superalloy VSF were characterized before and after cold upsetting. Compared to the solution-aging treatment (SAT) valve, the solution-cold upsetting-aging treatment (SCUAT) valve hardness was increased by 60 HV0.2. SCUAT valves exhibited higher internal dislocation degrees and local misorientation than SAT valves. Bench-top wear tests at 650 degrees C and 750 degrees C were conducted. The valve wear loss at 650 degrees C was higher than that at 750 degrees C. SCUAT valves show better wear resistance, with a total wear loss reduction up to 26.76 %. The SCUAT valve-seat insert contact pair wear mechanisms are adhesive and fatigue wear.
Keyword :
Internal combustion engine exhaust valve Internal combustion engine exhaust valve Plastic deformation processing Plastic deformation processing Valve seating face Valve seating face Wear mechanisms Wear mechanisms
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GB/T 7714 | Lai, Fuqiang , Cao, Changsheng , Shi, Chuangwei et al. Improvement of wear resistance for engine valve: Introducing cold upsetting treatment on valve seating face [J]. | WEAR , 2025 , 564-565 . |
MLA | Lai, Fuqiang et al. "Improvement of wear resistance for engine valve: Introducing cold upsetting treatment on valve seating face" . | WEAR 564-565 (2025) . |
APA | Lai, Fuqiang , Cao, Changsheng , Shi, Chuangwei , Sun, Ge , Qu, Rong , Mo, Dongqiang et al. Improvement of wear resistance for engine valve: Introducing cold upsetting treatment on valve seating face . | WEAR , 2025 , 564-565 . |
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3D-Kagome lattice sandwich panels are mainly composed of upper and lower panels and a series of symmetrically and periodically arranged lattices, known for their excellent high specific stiffness, high specific strength, and energy absorption capacity. The inherent geometrical symmetry of the 3D-Kagome lattice plays a crucial role in achieving superior mechanical stability and load distribution efficiency. This structural symmetry enhances the uniformity of stress distribution, making it highly suitable for automotive vibration suppression, such as battery protection for electric vehicles. In this study, a polyurethane foam-filled, symmetry-enhanced 3D-Kagome sandwich panel is designed following an optimization of the lattice structure. A novel fabrication method combining precision wire-cutting, interlocking core assembly, and in situ foam filling is employed to ensure a high degree of integration and manufacturability of the composite structure. Its mechanical properties and energy absorption characteristics are systematically evaluated through a series of experimental tests, including quasi-static compression, three-point bending, and low-speed impact. The study analyzes the effects of core height on the structural stiffness, strength, and energy absorption capacity under varying loads, elucidating the failure mechanisms inherent to the symmetrical lattice sandwich configurations. The results show that the foam-filled sandwich panels exhibit significant improvements in mechanical performance compared to the unfilled ones. Specifically, the panels with core heights of 15 mm, 20 mm, and 25 mm demonstrate increases in bending stiffness of 47.3%, 53.5%, and 51.3%, respectively, along with corresponding increases in bending strength of 45.5%, 53.1%, and 50.9%. The experimental findings provide a fundamental understanding of foam-filled lattice sandwich structures, offering insights into their structural optimization for lightweight energy-absorbing applications. This study establishes a foundation for the development of advanced crash-resistant materials for automotive, aerospace, and protective engineering applications. This work highlights the structural advantages and crashworthiness potential of foam-filled Kagome sandwich panels, providing a promising foundation for their application in electric vehicle battery enclosures, aerospace impact shields, and advanced protective systems.
Keyword :
3D-Kagome lattice sandwich panel 3D-Kagome lattice sandwich panel energy absorption energy absorption impact resistance impact resistance mechanical property mechanical property polyurethane foam filling polyurethane foam filling
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GB/T 7714 | Wu, Zhangbin , Li, Qiuyu , Chai, Chao et al. Experimental Investigation into the Mechanical Performance of Foam-Filled 3D-Kagome Lattice Sandwich Panels [J]. | SYMMETRY-BASEL , 2025 , 17 (4) . |
MLA | Wu, Zhangbin et al. "Experimental Investigation into the Mechanical Performance of Foam-Filled 3D-Kagome Lattice Sandwich Panels" . | SYMMETRY-BASEL 17 . 4 (2025) . |
APA | Wu, Zhangbin , Li, Qiuyu , Chai, Chao , Chen, Mao , Ye, Zi , Qiu, Yunzhe et al. Experimental Investigation into the Mechanical Performance of Foam-Filled 3D-Kagome Lattice Sandwich Panels . | SYMMETRY-BASEL , 2025 , 17 (4) . |
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K417G superalloy is widely applied in gas turbine components such as blades, vanes, and nozzles. In this work, the oxidation behavior and mechanism of K417G alloy prepared by wide-gap brazing were investigated in air at 800, 900, 1000, and 1100 °C. Microstructures of the bonded joints differ in the wide-gap braze region (WGBR) and base metal (BM). The surface and cross-sectional morphology, composition, and structure of specimens were analyzed by XRD, SEM, and EDS after oxidation tests. The experimental data demonstrate that the WGBR (wide-gap brazed region) exhibits markedly superior oxidation resistance compared to the BM (base material) under elevated-temperature conditions exceeding 1000 °C. This performance disparity is quantitatively validated by oxidation kinetics analysis, where the weight gain curve of the WGBR demonstrates parabolic oxidation kinetics, as evidenced by its significantly lower parabolic rate constant relative to the BM. The oxide layers of the BM and WGBR are similar after oxidation at high temperatures of 800–900 °C, and they consist of an outermost layer of NiO, a middle mixed layer of Cr2O3, and an innermost layer of dendritic Al2O3. However, when the temperature is between 1000 and 1100 °C, the NiO on the surface of the BM spalls of due to thermal expansion coefficient mismatch in coarse-grained regions, resulting in oxidation mainly divided into outer layer Cr2O3 and inner layer Al2O3 and TiO2. Under high-temperature oxidation conditions (1000–1100 °C), a structural transition occurs in the oxide scale of the BM, with the underlying mechanism attributable to grain-coarsening-induced oxide scale destabilization. Specifically, the coarse-grained structure of the BM (characteristic grain size exceeding 50 μm) is exhibited. Therefore, the WGBR demonstrates outstanding oxidation resistance, as evidenced by the formation of a continuous Al2O3 scale with parabolic rate constants of about 1.38 × 10−3 mg2·cm−4·min−1 at 1100 °C. © 2025 by the authors.
Keyword :
Coarsening Coarsening Electric brazing Electric brazing Thermooxidation Thermooxidation Titanium dioxide Titanium dioxide
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GB/T 7714 | Cheng, Zhun , Lai, Xin , He, Jing et al. Microstructural Investigation and High-Temperature Oxidation Performance of K417G Alloy Prepared by Wide-Gap Brazing [J]. | Crystals , 2025 , 15 (5) . |
MLA | Cheng, Zhun et al. "Microstructural Investigation and High-Temperature Oxidation Performance of K417G Alloy Prepared by Wide-Gap Brazing" . | Crystals 15 . 5 (2025) . |
APA | Cheng, Zhun , Lai, Xin , He, Jing , Li, Xiaoqiang , Fan, Jiafeng , Lai, Fuqiang . Microstructural Investigation and High-Temperature Oxidation Performance of K417G Alloy Prepared by Wide-Gap Brazing . | Crystals , 2025 , 15 (5) . |
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This work aims to significantly improve the mechanical properties of conventional rigid lattice structures under repeatable large deformations. A novel hybrid material is proposed based on the concept of interpenetrating composite materials. The material utilizes a woven TC4 orthogonal spiral wire mesh as the skeleton and PU elastomer (OSWM-PU) as the matrix. The uniaxial tensile tests demonstrate that OSWM-PU possesses the excellent load-bearing capacity, allowing for large deformations (>= 60%) while maintaining partial integrity even after matrix fracture. Optical measurements and simulation analysis reveal that Poisson's ratio can be adjusted within a certain range by manipulating the microscopic parameters (p, d) of the longitudinal helical filaments. Cyclic tensile experiments further demonstrate that OSWM-PU exhibits exceptional energy absorption performance, multiple energy dissipation modes, and a more pronounced Mullins effect. The stress relaxation experiment reveals the significant influence of the volume fraction of the skeleton on long-term loading conditions. The orthogonal spiral wire skeleton exhibits a superior hooking effect without dividing the matrix, enabling OSWM-PU to possess enhanced collaborative deformation capability and inherent designability in the orthogonal direction. These characteristics make it highly promising for applications in various robot joints and as flexible aircraft skin, offering excellent prospects for utilization. This work presents a novel hybrid composite with orthogonal spiral wire mesh and polyurethane elastomer. The variation of Poisson's ratio is analyzed. Two main research findings are 1) increased energy dissipation is attributed to friction and debonding occurring at the interface; and 2) higher volume fraction of the wire mesh results in reduced stress retention capacity.image (c) 2024 WILEY-VCH GmbH
Keyword :
cyclic tensile cyclic tensile interpenetrating composites interpenetrating composites orthogonal spiral wire meshes orthogonal spiral wire meshes Poisson's ratios Poisson's ratios stress relaxation performances stress relaxation performances
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GB/T 7714 | Xue, Xin , Lin, Congcong , Ye, Zixiong et al. Mechanical Behaviors of Hybrid Composites with Orthogonal Spiral Wire Mesh and Polyurethane Elastomer [J]. | ADVANCED ENGINEERING MATERIALS , 2024 , 26 (10) . |
MLA | Xue, Xin et al. "Mechanical Behaviors of Hybrid Composites with Orthogonal Spiral Wire Mesh and Polyurethane Elastomer" . | ADVANCED ENGINEERING MATERIALS 26 . 10 (2024) . |
APA | Xue, Xin , Lin, Congcong , Ye, Zixiong , Lai, Fuqiang . Mechanical Behaviors of Hybrid Composites with Orthogonal Spiral Wire Mesh and Polyurethane Elastomer . | ADVANCED ENGINEERING MATERIALS , 2024 , 26 (10) . |
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Metal rubber component (MRC) is commonly used in special work conditions such as high temperature/corrosive environments primarily due to its excellent vibration damping/insulation properties. But in special work conditions for a long time, the performance of MRC will deteriorate to a failure to meet the work requirements. Therefore, it is imperative to enhance the performance of MRC and study its performance degradation in special work conditions. In this paper, pickling, silanization and pickle-silanization surface treatments for metal rubber components (MRCs) were carried out. The properties of MRCs after surface treatment under static compression and full immersion corrosive test were studied, and a remaining service life prediction model of MRCs under corrosion condition was established. Compared with MRC without surface treatment (U-MRC), the performance degradation degree of several MRCs was evaluated based on four physical and mechanical parameters - the amplitude of variation in height, average stiffness, energy dissipation, and loss factor. The results indicated that MRCs exhibited different degrees of performance degradation. Among them, pickling-silanized MRC (PS-MRC) has the best corrosion resistance. The stiffness variation amplitude must be nearly 8% smaller than that of UMRC, and the energy consumption variation amplitude is about 12% smaller than that of U-MRC.
Keyword :
Full immersion corrosion conditions Full immersion corrosion conditions Metal rubber components Metal rubber components Performance degradation patterns Performance degradation patterns Remaining service life prediction Remaining service life prediction Surface treatments Surface treatments
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GB/T 7714 | Lai, Fuqiang , Gao, Guilin , Hao, Xiangfei et al. Research on performance degradation patterns of metal rubber components under the coupling of static compression and full immersion corrosive environment [J]. | MATERIALS TODAY COMMUNICATIONS , 2024 , 39 . |
MLA | Lai, Fuqiang et al. "Research on performance degradation patterns of metal rubber components under the coupling of static compression and full immersion corrosive environment" . | MATERIALS TODAY COMMUNICATIONS 39 (2024) . |
APA | Lai, Fuqiang , Gao, Guilin , Hao, Xiangfei , Hu, Anqiong , Xue, Xin , Bai, Hongbai et al. Research on performance degradation patterns of metal rubber components under the coupling of static compression and full immersion corrosive environment . | MATERIALS TODAY COMMUNICATIONS , 2024 , 39 . |
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To explore the wide-frequency damping and vibration-attenuation performances in the application of aerospace components, the cylindrical sandwich shell structure with a gradient core of entangled wire mesh was proposed in this paper. Firstly, the gradient cores of entangled wire mesh in the axial and radial directions were prepared by using an in -house Numerical Control weaving machine, and the metallurgical connection between skin sheets and the gradient core was performed using vacuum brazing. Secondly, to investigate the mechanical properties of cylindrical sandwich shells with axial or radial gradient cores, quasi-static and dynamic mechanical experiments were carried out. The primary evaluations of mechanical properties include secant stiffness, natural frequency, Specific Energy Absorption (SEA), vibration acceleration level, and so on. The results suggest that the vibration-attenuation performance of the sandwich shell is remarkable when the high-density core layer is at the end of the shell or abuts the inner skin. The axial gradient material has almost no influence on the vibration frequencies of the shell, whereas the vibration frequencies increase dramatically when the high-density core layer approaches the skin. Moreover, compared to the conventional sandwich shells, the proposed functional grading cylindrical sandwich shell exhibits more potential in mass reduction, stiffness designing, and energy dissipation. (c) 2023 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
Keyword :
Damping Damping Entangled wire mesh Entangled wire mesh Gradient cylindrical sandwich shell Gradient cylindrical sandwich shell Secant stiffness Secant stiffness Vacuum brazing Vacuum brazing
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GB/T 7714 | Xue, Xin , Zheng, Chao , Lai, Fu-qiang et al. Mechanical property of cylindrical sandwich shell with gradient core of entangled wire mesh [J]. | DEFENCE TECHNOLOGY , 2024 , 31 : 510-522 . |
MLA | Xue, Xin et al. "Mechanical property of cylindrical sandwich shell with gradient core of entangled wire mesh" . | DEFENCE TECHNOLOGY 31 (2024) : 510-522 . |
APA | Xue, Xin , Zheng, Chao , Lai, Fu-qiang , Wu, Xue-qian . Mechanical property of cylindrical sandwich shell with gradient core of entangled wire mesh . | DEFENCE TECHNOLOGY , 2024 , 31 , 510-522 . |
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As a nickel -based alloy, GH4169 has the properties of excellent corrosion resistance, high temperature oxidation resistance and high creep resistance. In this paper, the compression creep behaviors of cylinder entangled wire materials (CEWMs) made from metal wires (GH4169 nickel -based alloy, 304 stainless steel) were investigated at elevated temperatures (from 400 degrees C to 500 degrees C). The performance degradation of the two materials was evaluated by the variation amplitude of four mechanical properties parameters and material characterization methods. The results indicated that both of 304 CEWMs and GH4169 CEWMs suffered a significant performance degradation at elevated temperatures, and both of the two CEWMs showed a much serious performance degradation above 450 degrees C (tempering temperature). Compared to the 304 CEWMs at the tested temperatures, the GH4169 CEWMs obtained better creep resistance. It is therefore concluded that the GH4169 CEWM is an excellent material that can replace the commonly used 304 CEWM at elevated temperature work conditions.
Keyword :
Creep Creep Cylinder entangled wire material Cylinder entangled wire material Nickel -based alloy wire Nickel -based alloy wire Performance degradation evaluation Performance degradation evaluation Porous materials Porous materials
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GB/T 7714 | Lai, Fuqiang , Gao, Guilin , Zhou, Congjian et al. Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures [J]. | MATERIALS LETTERS , 2024 , 371 . |
MLA | Lai, Fuqiang et al. "Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures" . | MATERIALS LETTERS 371 (2024) . |
APA | Lai, Fuqiang , Gao, Guilin , Zhou, Congjian , Wu, Yiwan , Xue, Xin . Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures . | MATERIALS LETTERS , 2024 , 371 . |
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Nickel-aluminum bronze alloys are prone to tool surface bonding and wear on the tool substrate during the cutting process. The correlation between tool surface bonding morphology, rear face wear, and cutting force is analyzed in terms of the dry turning method for cutting 9442-nickel-aluminum bronze. The rational cutting parameters and the mechanism of tool wear are further discussed. The results indicate that adhesion, oxidation, and abrasive wear occur on the tool surface during turning. At a turning length of 2000 m, tool wear increases with increasing cutting speed and feed. There is a tool wear difference of 2 to 3 mu m between adjacent cutting parameters, but the wear is similar at cutting speeds of 140 and 180 m/min. By appropriately reducing the cutting speed and feed rate, it is possible to promote the formation of an adhering layer on the rear face of the tool, thereby reducing overall tool wear. The best cutting results are achieved at a chip speed of 100 m/min and a feed rate of 0.05 mm/rev. However, at higher cutting speeds, there is susceptibility to the "bonding-flaking" phenomenon where material adheres to the tool surface, leading to fluctuations in cutting forces and accelerated tool wear. Higher feed rates result in increased cutting forces, which hinder the formation of an adhering layer on the rear face, causing severe wear on the tool matrix.
Keyword :
bonding-flaking bonding-flaking cutting forces cutting forces nickel-aluminum bronze alloy nickel-aluminum bronze alloy tool wear tool wear tool wear mechanisms tool wear mechanisms
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GB/T 7714 | Zou, Weiqiang , Lai, Fuqiang , Yi, Dongdong et al. Variation of Cutting Forces with Different Cutting Parameters and Tool Wear during Turning of 9442-Nickel-Aluminum Bronze [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 , 34 (8) : 7173-7188 . |
MLA | Zou, Weiqiang et al. "Variation of Cutting Forces with Different Cutting Parameters and Tool Wear during Turning of 9442-Nickel-Aluminum Bronze" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 34 . 8 (2024) : 7173-7188 . |
APA | Zou, Weiqiang , Lai, Fuqiang , Yi, Dongdong , Lin, Youxi . Variation of Cutting Forces with Different Cutting Parameters and Tool Wear during Turning of 9442-Nickel-Aluminum Bronze . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 , 34 (8) , 7173-7188 . |
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