STRUCTURE EVOLUTION IN DIRECTIONALLY SOLIDIFIED BICRYSTALS OF NICKEL BASE SUPERALLOYS

doi:10.3724/SP.J.1037.2010.00280

Acta Metall Sin

2010, Vol. 46

Issue (11): 1327-1334 DOI: 10.3724/SP.J.1037.2010.00280

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STRUCTURE EVOLUTION IN DIRECTIONALLY SOLIDIFIED BICRYSTALS OF NICKEL BASE SUPERALLOYS

ZHOU Yizhou, JIN Tao, SUN Xiaofeng

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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ZHOU Yizhou JIN Tao SUN Xiaofeng. STRUCTURE EVOLUTION IN DIRECTIONALLY SOLIDIFIED BICRYSTALS OF NICKEL BASE SUPERALLOYS. Acta Metall Sin, 2010, 46(11): 1327-1334.

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Abstract Bicrystal samples of Ni base superalloy IN792 were produced to study the structure evolution in directional solidification process. In the case of converging grains, the misaligned dendrites were able to block the better aligned dendrites at the grain boundary. The dendrite blocking leaded to inclination of the grain boundary from the misaligned grain to the better aligned grain. Thus, the better aligned grain was overgrown by the misaligned grain. In the case of diverging grains, dendrite development at the grain boundary leaded to inclination of the grain boundary from the better aligned grain to the misaligned grain. Consequently, the better aligned grain overgrew the misaligned grain.

Key words: superalloy directional solidification dendrite growth competitive grain growth

Received: 11 June 2010

ZTFLH:	TG21
	TG249.9

Fund:

Supported by National Natural Science Foundation of China (No.{\footnotesize\it 50931004}), National Basic Research Program of China (No.{\footnotesize\it 2010CB631206}) and Program of “One Hundred Talented People”of the Chinese Academy of Sciences

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00280 OR https://www.ams.org.cn/EN/Y2010/V46/I11/1327

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