Effect of rare earth on the microstructures and properties of a low expansion superalloy

IMR OpenIR

	Effect of rare earth on the microstructures and properties of a low expansion superalloy
	R. M. Wang; Y. G. Song; Y. F. Han
	2000
发表期刊	Journal of Alloys and Compounds
ISSN	0925-8388
卷号	311 期号:1 页码:60-64
摘要	A new Fe-Ni-Co-Nb-Ti-Si superalloy containing trace additions of selective rare earths and having with combination of very low thermal expansion coefficient, high resistance to stress accelerated grain boundary oxygen embrittlement and fairly good notch-bar rupture strength has been successfully developed. The resistance to oxidation for long time exposure at high temperatures and the stress rupture life improves significantly with trace yttrium additions. The microstructures of the alloy have been studied by means of analytical electron microscopy and chemical analysis techniques. The results reveal that the rare earth element segregates in the strengthening phase of platelet morphology. Further it helps in transforming A(3)B type epsilon phase into A(5)B type H phase. The morphology and crystal structures of the grain boundary phases also change with selective additions of rare earth elements. The platelet precipitates become smaller and denser, and forms within the grains and along the grain boundaries with the additions of rare earth elements. The segregation of the platelet precipitates within the grains is helpful in improving the strength of the alloy. In addition its precipitation along the grain boundaries can improve the resistance to stress accelerated grain boundary oxidation and stress rupture property of the alloy and thereby contributed to its excellent elevated temperature stability. (C) 2000 Elsevier Science S.A. All rights reserved.
部门归属	beijing inst aeronaut mat, beijing 100095, peoples r china. chinese acad sci, inst met res, atom imaging solids lab, shenyang 110015, peoples r china.;wang, rm (reprint author), beijing inst aeronaut mat, pob 81-4, beijing 100095, peoples r china
关键词	Fe-ni-co-nb-ti-si Superalloy Rare Earth Element Micro-mechanism
URL	查看原文
WOS记录号	WOS:000089579600012
引用统计	被引频次：38[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/321006/37193
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	R. M. Wang,Y. G. Song,Y. F. Han. Effect of rare earth on the microstructures and properties of a low expansion superalloy[J]. Journal of Alloys and Compounds,2000,311(1):60-64.
APA	R. M. Wang,Y. G. Song,&Y. F. Han.(2000).Effect of rare earth on the microstructures and properties of a low expansion superalloy.Journal of Alloys and Compounds,311(1),60-64.
MLA	R. M. Wang,et al."Effect of rare earth on the microstructures and properties of a low expansion superalloy".Journal of Alloys and Compounds 311.1(2000):60-64.