首页|Influence of tungsten particle size on microstructure and mechanical properties of high strength and tough tungsten particle-reinforced nickel-based composites by laser-direct energy deposition

Influence of tungsten particle size on microstructure and mechanical properties of high strength and tough tungsten particle-reinforced nickel-based composites by laser-direct energy deposition

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Tungsten(W)particle-reinforced nickel(Ni)-based composites were fabricated via laser-direct energy de-position(L-DED).The influence of the W particle size on the microstructure and mechanical properties of the deposited samples was systematically studied.The results indicate that refining the W particle size could refine the y-Ni grains and subgrains,thin the(Ni,Cr)4 W interface layer,and increase the disloca-tion density of the intergranular matrix,thus improving the tensile strength and elongation of the L-DED samples.As W particle size decreased from 75 to 150 μm to 6.5-12 μm,the tensile strength and elonga-tion of the deposited samples increased by 150 MPa and 2.9 times to 1347.6±15.7 MPa and 17.5±0.4％,respectively.Based on the properties of the interface(Ni,Cr)4 W,a load-transfer efficiency factor suitable for this composite was proposed and the load-transfer strengthening formula was optimized.A quanti-tative analysis of the strengthening mechanisms was established considering load-transfer strengthening,Hall-Petch strengthening,thermal-mismatch strengthening,and solid-solution strengthening.The calcu-lated contribution of each strengthening mechanism to the yield strength and theoretical calculations were in good agreement with the experimental data.The article breaks the bottleneck of poor plasticity of W particle-reinforced Ni-based composites prepared by L-DED and provides a theoretical basis for the construction design of W particle-reinforced Ni-based composites with excellent mechanical properties.

Laser-direct energy deposition(L-DED)Tungsten particle reinforcementsMechanical propertyStrengthening mechanism

Wenji Song、Dengzhi Wang、Congwen Tang、Pengfei Sun、Jiaxing Yang、Zhidong Xu、Tao Lai、Jianqiang Gong、Qianwu Hu、Xiaoyan Zeng

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Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430000,China

Key Projects of the National Natural Science Foundation of ChinaKey Projects of the National Natural Science Foundation of ChinaJiangxi Provincial Key R&D Programme Projects

920662019226610120212BBE51011

2024

10.1016/j.jmst.2023.06.050

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.172(5)
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