Effects of powder feeding rate on microstructure and mechanical properties of GH4169

Yuluan Zhang; Chen Liu; Wenbo Yao; Shuo Shang; Changsheng Liu

doi:10.1117/12.2636520

10 June 2022 Effects of powder feeding rate on microstructure and mechanical properties of GH4169

Yuluan Zhang, Chen Liu, Wenbo Yao, Shuo Shang, Changsheng Liu

Proceedings Volume 12179, Second International Conference on Medical Imaging and Additive Manufacturing (ICMIAM 2022); 121790D (2022) https://doi.org/10.1117/12.2636520
Event: Second International Conference on Medical Imaging and Additive Manufacturing (ICMIAM 2022), 2022, Xiamen, China

Abstract

In this study, the GH4169 samples were prepared by Laser Melting Deposition(LMD) using a SMAT 5M-060 HC fiber laser. By studying the effect of different powder feeding rates on the samples manufactured by LMD, adjusting the process parameters, and comparing the deposition state with the heat-treated state, the effect of heat treatment process on the microstructure and properties of GH4169 was studied. The samples were characterized by microscope, mechanical experiment and scanning electron microscope. The results showed that the microstructur e of GH4169 alloy deposited by laser melting deposition was mainly composed of γ matrix phase, γ" phase, γ' phase, δ phase and some carbides dispersed in the grain. After heat treatment, the microstructure of GH4169 sample was smaller and compact, equiaxed grain area was larger, columnar grain was less, some bad Laves phase and carbide were dissolved, δ phase was precipitated at grain boundary, which improved the properties of GH4169 on the whole. With the increase of powder feeding rate, the fracture of the deposited sample was ductile fracture, and the elongation increased first and then decreased. The tensile strength and yield strength of heat-treated sample increased, but the elongation decreased. The microhardness of deposition was 314~323 HV and the heat-treated samples were 469~498 HV.

Citation Download Citation

Yuluan Zhang, Chen Liu, Wenbo Yao, Shuo Shang, and Changsheng Liu "Effects of powder feeding rate on microstructure and mechanical properties of GH4169", Proc. SPIE 12179, Second International Conference on Medical Imaging and Additive Manufacturing (ICMIAM 2022), 121790D (10 June 2022); https://doi.org/10.1117/12.2636520

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KEYWORDS

Heat treatments

Nickel

Scanning electron microscopy

Chemical elements

Iron

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