Relationship between eta phase formation and solidification rate in directionally solidified IN792 plus Hf alloy

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	Relationship between eta phase formation and solidification rate in directionally solidified IN792 plus Hf alloy
	W. R. Sun; J. H. Lee; S. M. Seo; S. J. Choe; Z. Q. Hu
	1999
发表期刊	Materials Science and Technology
ISSN	0267-0836
卷号	15 期号:11 页码:1221-1224
摘要	The effect of solidification rate on the formation of eta phase in a directionally solidified IN792 + Hf super alloy was studied. A Cr rich 'precipitate free zone' adjacent to the eutectic (gamma + gamma') was noticed in the quenched directionally solidified microstructure of the alloy. The formation of the precipitate free zone Mras due to the solidification of eutectic (gamma + gamma') which consumed a large amount of the gamma' forming elements and increased the ratio of (Ti + Hf + Ta + W)/Al in the residual liquid. The high ratio of(Ti + Hf + Ta + W)/Al in the final residual liquid induced the formation of eta phase and hence eta phase always appeared at the boundary between the eutectic regions and the dendrite core regions. The ratio of (Ti + Hf + Ta + W)/Al was decreased by the diffusion of elements between the residual liquid and the surrounding ai ea. A lower solidification rate favoured the back diffusion and decreased the ratio of (Ti + Hf + Ta + W)/Al in the residual liquid and hence reduced the formation of eta phase. MST/4279.
部门归属	chinese acad sci, inst met res, dept superalloys & special castings, shenyang 110015, peoples r china. chinese acad sci, state key lab rapidly solidified nonequilibrium a, inst met res, shenyang 110015, peoples r china. changwon natl univ, dept met & mat sci, kyungnam 641773, south korea. korea inst machinery & mat, high temp mat lab, kyungnam 641010, south korea.;sun, wr (reprint author), chinese acad sci, inst met res, dept superalloys & special castings, 72 wenhua rd, shenyang 110015, peoples r china
关键词	Superalloy
URL	查看原文
WOS记录号	WOS:000083830900001
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37496
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. R. Sun,J. H. Lee,S. M. Seo,et al. Relationship between eta phase formation and solidification rate in directionally solidified IN792 plus Hf alloy[J]. Materials Science and Technology,1999,15(11):1221-1224.
APA	W. R. Sun,J. H. Lee,S. M. Seo,S. J. Choe,&Z. Q. Hu.(1999).Relationship between eta phase formation and solidification rate in directionally solidified IN792 plus Hf alloy.Materials Science and Technology,15(11),1221-1224.
MLA	W. R. Sun,et al."Relationship between eta phase formation and solidification rate in directionally solidified IN792 plus Hf alloy".Materials Science and Technology 15.11(1999):1221-1224.