SPS工艺制备镍基高温合金的微观组织

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Abstract Nickel-base superalloys were sintered by spark plasma sintering (SPS) using the powders of FGH96 fabricated by argon vaporization method as raw material. At the same time, the raw material powder was heat-treated under the same conditions as the SPS process, and the FGH96 superalloy was prepared by hot isostatic pressing (HIP). By analyzing the microstructure and grain size of the alloy at different sintering temperatures or different heat preservation time, the grain orientation and grain size of the alloy fabricated by HIP with heat treatment powder were compared, and the microstructure characteristics of SPS Ni-based superalloy were studied. The results show that the alloy is nearly densified after sintering for 40 min. While the microstructure of the alloy is composed of tiny cellular structure and dendrite crystals when sintered at 1 070 ℃. The carbide precipitates distribute mainly inside the grains with a few on the grain boundaries, which results in almost invisible PPBs. The microstructure of the alloy is composed of equiaxed grains when sintered at 1 170 ℃. The carbide precipitates distribute along the prior particle boundaries, which make quite obvious PPBs. It is indicated that the method of SPS can reduce the PPBs in certain degree, but it had no effect on control the grain size.

Key words： Nickel-based superalloys powder metallurgy spark plasma sintering (SPS) prior particle boundries (PPBs) grain size

Received: 02 March 2018 Published: 12 July 2019

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	QIN Zijun
	LIU Feng
	JIANG Liang

Cite this article:

QIN Zijun,LIU Feng,JIANG Liang. Microstructure of Nickel-based superalloys prepared by spark plasma sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 488-494.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I5/488

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