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The role of primary Laves phase on the crack initiation and propagation in Thermo-Span alloy
Yu, L. X.; Sun, W. R.; Zhang, Z. B.; Zhang, W. H.; Liu, F.; Xin, X.; Qi, F.; Jia, D.; Hu, Z. Q.; wrsun@imr.ac.cn
2015
发表期刊MATERIALS RESEARCH INNOVATIONS
ISSN1432-8917
卷号19页码:S68-S72
摘要Thermo-Span alloy is an oxidation resistant low thermal expansion superalloy and shows good mechanical properties, which has been used to fabricate components in gas turbine engine to control the clearance between static and rotating part, and thus improve the efficiency. Owing to the insufficient Cr, it was not applicable for this alloy to employ long homogenisation treatment at high temperature, and consequently, the primary Laves phase formed during the solidification process might be remained in this alloy. However, few studies were carried out on studying the role of primary Laves phase in this alloy. This paper studied the effects of primary Laves phase particles on the crack initiation and propagation during tensile test at room temperature, 650 and 750 degrees C of the rolled bar made from casting Thermo-Span alloy. It was found that at room temperature, cracks were mainly related with the Laves phase larger than 5 mu m and the Laves clusters. At 650 degrees C, cracks were formed preferentially at large Laves particles, but they would propagate faster at grain boundaries. At 750 degrees C, as the hardening effect of gamma' phase was not effective, and the stress concentrated at large Laves phase would be released by grain deformation, so that large cracks were no longer widely spread and more intergranular cracks especially at surface of the specimen were found.
部门归属[yu, l. x. ; sun, w. r. ; zhang, w. h. ; liu, f. ; xin, x. ; qi, f. ; jia, d. ; hu, z. q.] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [zhang, z. b.] xian thermal power res inst co ltd, xian 710032, peoples r china
关键词Thermo-span Laves Phase Microstructure Crack Grain Boundary
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/75206
专题中国科学院金属研究所
通讯作者wrsun@imr.ac.cn
推荐引用方式
GB/T 7714
Yu, L. X.,Sun, W. R.,Zhang, Z. B.,et al. The role of primary Laves phase on the crack initiation and propagation in Thermo-Span alloy[J]. MATERIALS RESEARCH INNOVATIONS,2015,19:S68-S72.
APA Yu, L. X..,Sun, W. R..,Zhang, Z. B..,Zhang, W. H..,Liu, F..,...&wrsun@imr.ac.cn.(2015).The role of primary Laves phase on the crack initiation and propagation in Thermo-Span alloy.MATERIALS RESEARCH INNOVATIONS,19,S68-S72.
MLA Yu, L. X.,et al."The role of primary Laves phase on the crack initiation and propagation in Thermo-Span alloy".MATERIALS RESEARCH INNOVATIONS 19(2015):S68-S72.
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