第四代粉末高温合金FGH4102 长期时效过程中γ′相演变规律

doi:10.13228/j.boyuan.issn1006-6543.20190050

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Abstract The evolution behavior of γ′ phases during long-term aging at 750-850 ℃ in an advanced Ni-based powder metallurgy（PM）superalloy FGH4102 was investigated. The results show that the primary γ′ phase has good stability during long-term aging. The tertiary γ′ phase mainly exists in 750 ℃ and early stage in 800 ℃. After the precipitation reaches saturation，it basically conforms to Ostwald ripening theory with the extension of aging time. Then it gradually dissolves in the later stage. During aging at 700 ℃ and 850 ℃，anti-coarsening caused by splitting occurs in the secondary γ′ phase. Nevertheless the secondary γ′ phase grow continuously with time increasing at 850 ℃. In the later aging stage at 800 ℃ and 850 ℃ ，the secondary γ′ phases transform into cubic and align along the <100> direction. The influence of aging temperature and time on the hardness of the alloy is great. In the later aging stage，the change of hardness value is mainly dependent on the change of size of the secondary γ′ phase.

Key words： the fourth generation powder metallurgy superalloy FGH4102 γ′ phase coarsening splitting

Received: 08 March 2019

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	Articles by authors
	HOU Qiong
	TAO Yu
	JIA Jian
	ZHANG Guo-dong
	QU Jing-long

Cite this article:

HOU Qiong,TAO Yu,JIA Jian, et al. Evolution of γ′ phases of the fourth generation powder metallurgy superalloy FGH4102 during long-term aging[J]. Powder Metallurgy Industry, 2020, 30(05): 38-44.

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http://edit.chinamet.cn/Jweb_fmyjgy/EN/10.13228/j.boyuan.issn1006-6543.20190050 OR http://edit.chinamet.cn/Jweb_fmyjgy/EN/Y2020/V30/I05/38