镍基粉末高温合金的微观组织与低周疲劳性能

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Abstract A new Ni based powder metallurgy superalloy was prepared by hot isostatic pressing, hot extrusion (HE) and 1 130 ℃/1 h heat treatment using Ni based alloy powder as raw material. The low cycle fatigue behavior including the microstructure of the pristine alloy, cyclic stress response and fracture morphology of the alloy were studied by a LCF test under atmospheric environment at 750 ℃. The results indicate that the previous particle boundary (PPB) appears after hot isostatic pressing, which is mainly consisted of coarse γ′ and fine carbon oxides. After HE and heat treatment, PPB disappears and grains refine to 7.5 μm. There are three types of γ′ phase after heat treatment, coarse γ′ phase on boundary, nearly spherical medium size γ′ phase and dispersed fine spherical γ′ phase intragranular. The low cycle fatigue fracture mode of the alloy is mainly intergranular fracture, and the grain surface of the fracture surface has different degree of oxidation.

Key words： nickel-based super alloy hot isostatic pressing high temperature low cycle fatigue microstructure

Received: 09 March 2017 Published: 11 July 2019

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	WU Chengxin
	WANG Zi
	JIANG Liang

Cite this article:

WU Chengxin,WANG Zi,JIANG Liang. Microstructure and low cycle fatigue behavior of P/M nickel-based superalloy[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(1): 25-31.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I1/25

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