Influence of solidification rate on precipitation and microstructure of directional solidification IN792+Hfsuperalloy

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	Influence of solidification rate on precipitation and microstructure of directional solidification IN792+Hfsuperalloy
	W. R. Sun; Z. Q. Hu; J. H. Lee; S. M. Ceo; S. J. Choe
	1999
发表期刊	Journal of Materials Research
ISSN	0884-2914
卷号	14 期号:10 页码:3873-3881
摘要	The effect of solidification rate on the precipitation and microstructure of directional solidification IN792 + I-If alloy was studied. The solidification sequence and the initial precipitation temperature of different phases were determined by the observation of the quenched microstructure combined with the differential thermal analysis measurement. The script carbide was turned into faceted carbide with the drop of solidification rate. It was concluded by microstructure analysis that the faceted carbide was pushed by the gamma solid front before it was captured. The incorporation of gamma phase into the faceted carbide was due to the dendrite growth of the carbide toward one point and the mergence of the dendrites. Some long carbide bars were formed along the grain boundaries by continual reaction of eutectic (gamma + MC carbide) at a solidification rate of 0.5 mu m/s. Two zones, the gamma' forming elements enriched zone and depleted zone, were found in the residual liquid area. Eutectic gamma/gamma' nucleated in the gamma' forming elements enriched zone. The eta-phase precipitation was controlled by the ratio of (Ti + Hf + Ta + W)/Al in the residual liquid. The growth of eutectic gamma/gamma' increased the ratio and induced the eta-phase precipitation. A lower solidification rate decreased the ratio by sufficient diffusion and hence efficiently suppressed the eta-phase precipitation.
部门归属	chinese acad sci, inst met res, dept superalloys & special castings, shenyang 110015, peoples r china. chinese acad sci, inst met res, state key lab rapidly solidified nonequilibrium a, shenyang 110015, peoples r china. changwon natl univ, dept met & mat sci, changwon 641773, kyungnam, south korea. korea res inst machinery & mat, high temp mat lab, changwon 641010, kyungnam, south korea.;sun, wr (reprint author), chinese acad sci, inst met res, dept superalloys & special castings, 72 wenhua rd, shenyang 110015, peoples r china
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WOS记录号	WOS:000083163700010
引用统计	被引频次：5[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/321006/37494
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. R. Sun,Z. Q. Hu,J. H. Lee,et al. Influence of solidification rate on precipitation and microstructure of directional solidification IN792+Hfsuperalloy[J]. Journal of Materials Research,1999,14(10):3873-3881.
APA	W. R. Sun,Z. Q. Hu,J. H. Lee,S. M. Ceo,&S. J. Choe.(1999).Influence of solidification rate on precipitation and microstructure of directional solidification IN792+Hfsuperalloy.Journal of Materials Research,14(10),3873-3881.
MLA	W. R. Sun,et al."Influence of solidification rate on precipitation and microstructure of directional solidification IN792+Hfsuperalloy".Journal of Materials Research 14.10(1999):3873-3881.