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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 4    No. 2    June 1994

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MODEL FOR COARSENING OF SDAS AND ITS VERIFICATION IN MULTICOMPONENT SC SUPERALLOYS
Pan Yejin; Chen Zhongchun

403 Research Group; Northwestern polytechnical University; Xi’an70072

Abstract:Based on a general relationship of secondary dendrite arm spacing(SDAS)λ2 to solidification time t:λ23=k0t,a dependence of λ2 on thermal gradient and solidification rate has been presented by assumption of paraboloidal dendrite tip. With the model, secondary dendrite arm spacings predicted for multi component super alloy DD8 and PWA-1480 were in conformity with experimental data.

 

Key words: secondary dendrite arm spacing directional solidification SC superalloy

ISSN 1672-7029
CN 43-1423/U

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