Prof. Shuo Shang Profile

Prof. Shuo Shang

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Proceedings Article | 10 June 2022 Paper

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, 121790D (2022) https://doi.org/10.1117/12.2636520

KEYWORDS: Heat treatments, Scanning electron microscopy, Nickel, Iron, Chemical elements, Solids, Metals

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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.

Proceedings Article | 6 June 2021 Paper

Influence of energy density on the microstructure and mechanical properties of GH5188 superalloy formed by laser melting deposition

Chen Liu, Kuaikuai Guo, Yuluan Zhang, Shuo Shang, Changsheng Liu

Proceedings Volume 11849, 1184915 (2021) https://doi.org/10.1117/12.2599108

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Cobalt-based superalloys have been widely used in manufacturing high-temperature parts of gas turbine missiles, such as combustion chambers, exhaust nozzles, and heat exchangers in the nuclear energy industry. In order to meet the requirements for rapid manufacturing of these large-scale and high-performance components, the laser melting deposition (LMD) technology has attracted great attention in recent years. At present, the printability evaluation of Cobalt-based superalloys powder needs in-depth study. In this study, a cobalt-based superalloy (GH5188) has been additively manufacturing by using LMD for the first time. The self-designed gas atomization equipment is used to prepare GH5188 alloy powder, LMD technology is used to prepare as-deposited samples, the key process parameters and the resulted microstructure and mechanical properties are investigated. The results show that as the energy density increases, the pores and unfused defects of the as-deposited GH5188 sample decrease. The microstructure of the GH5188 sample is composed of columnar dendrites grown epitaxially, and carbides are precipitated in the grain boundaries and inside the crystals. As the energy density increases, the columnar crystals of the GH5188 sample are obviously thicker, and the hardness and elongation of the sample increase significantly. When the energy density is 70J/mm, the tensile strength of the sample can reach 806.3MPa; when the energy density is increased to 80J/m, the elongation of the sample is 33.01%;

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