微量元素Hf消除FGH96合金中原始粉末颗粒边界组织机制的探讨

doi:10.13228/j.boyuan.issn1006-6543.20140025

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Abstract The precipitates at prior particle boundary (PPB) are composed of carbide and small amount oxycarbide or oxide in PM superalloys. The composition and structure of carbide inside the powder, on the powder surface and on the PPB were investigated by SEM, TEM, AES techniques, etc. The mechanism of Hf eliminating prior particle boundary structure (PPBS) was discussed according to thermodynamics and diffusion theory. The results show that metastable MC type carbide MC′ rich in Ti, Nb, Cr, Mo and W elements forms on powder surface during atomization, the metastable MC′ carbide will transform into stable MC carbide during hot isostatic pressing (HIP) process. Ti and C inside powder particles will diffuse to sintering neck during HIP process, then stable MC carbide (Ti,Nb)C will form on powder particle boundaries. When micro-element Hf is added in, more and more stable MC type carbides containing Hf precipitate within powder particles, which means C and Ti elements are bound in (Ti,Nb,Hf)C carbides, suppressing the diffusion of C and Ti to sintering neck, and finally the precipitation of MC type carbides is inhibited.

Key words： PM superalloy Hf PPBs mechanism

Received: 17 March 2014 Published: 16 October 2014

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	ZHANG Yi-Wen

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ZHANG Yi-Wen. Discussion on the mechanism of micro-element Hf eliminating PPBS in powder metallurgy superalloy FGH96[J]. , 2014, 24(05): 1-7.

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http://edit.chinamet.cn/Jweb_fmyjgy/EN/10.13228/j.boyuan.issn1006-6543.20140025 OR http://edit.chinamet.cn/Jweb_fmyjgy/EN/Y2014/V24/I05/1

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