RECRYSTALLIZATION NUCLEATION MECHANISM OF FGH4096 POWDER METALLURGY SUPERALLOY

doi:10.3724/SP.J.1037.2012.00116

Acta Metall Sin

2012, Vol. 48

Issue (8): 1005-1010 DOI: 10.3724/SP.J.1037.2012.00116

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RECRYSTALLIZATION NUCLEATION MECHANISM OF FGH4096 POWDER METALLURGY SUPERALLOY

NING Yongquan, YAO Zekun

School of Material Science and Engineering, Northwestern Polytechnical University, Xi’an 710072

Cite this article:

NING Yongquan YAO Zekun. RECRYSTALLIZATION NUCLEATION MECHANISM OF FGH4096 POWDER METALLURGY SUPERALLOY. Acta Metall Sin, 2012, 48(8): 1005-1010.

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Abstract FGH4096 is regarded as a promising powder metallurgy superalloy for high–temperature/pressure turbine disc in aerospace industries due to its high resistance/defect tolerance and high working temperature up to 750 ℃. In the present work, OM and TEM have been employed to study the recrystallization nucleation and microstructure evolution in FGH4096 powder metallurgy superalloy. It is proved that there exist three types of recrystallization mechanisms: nucleation from previous particle boundary (PPB), strain–induced nucleation from butterfly γ' phase (SIP) and twins superposition (TS) nucleation. The physical explanation for this is given from the view of point of micro–segregation, formation of the bend fold boundary and twins superposition, atomic diffusion and dislocation movement.

Key words: powder metallurgy superalloy recrystallization nucleation mechanism

Received: 05 March 2012

ZTFLH:

TG 113

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Supported by National Natural Science Foundation of China (No.51101119) and China Postdoctoral Science Foundation (No.20110491686)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00116 OR https://www.ams.org.cn/EN/Y2012/V48/I8/1005

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