Influence of themal exposure on gamma ' precipitation and tensile properties of DZ951 alloy

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	Influence of themal exposure on gamma ' precipitation and tensile properties of DZ951 alloy
	P. C. Xia; J. J. Yu; X. F. Sun; H. R. Guan; Z. Q. Hu
	2007
发表期刊	Materials Characterization
ISSN	1044-5803
卷号	58 期号:7 页码:645-651
摘要	The effect of long-term exposure on the gamma' phase and the tensile behavior of a directionally solidified nickel-base superalloy DZ951 was investigated. Alloys after standard heat treatment (SHT) were isothermally aged at 900 degrees C up to 2000 h and tensile tests were performed in both SHT and aged conditions at various temperatures. The morphology of the gamma' phase changes from cuboid to rafting and the size increases from 300 nm at SHT to 930 nm, and the volume fraction of the gamma' phase decreases from 70% at SHT to 65% during aging at 900 degrees C for 2000 h. The changing trend of yield stress at different test temperatures is similar. The yield stress decreases slightly at 600 degrees C. This arises from few dislocations shearing the gamma' precipitates. There is a peak yield stress value at 760 degrees C, which is attributed to the high strength of the gamma' phase, the homogeneous deformation structure, and dislocation-gamma' precipitate and dislocation-dislocation interactions. The yield stress then decreases rapidly with increased temperature. The low strength of the gamma' phase and gamma' rafting at high temperature contribute to the drop of yield stress. The change of tensile elongation is inverse to that of yield stress. The yield stress continuously decreases with the increase of aging time at 900 degrees C. This arises from the coarsening of gamma' and a decrease in the gamma' volume fraction. (C) 2006 Elsevier Inc. All rights reserved.
部门归属	chinese acad sci, inst met res, shenyang 110016, peoples r china. chinese acad sci, grad sch, beijing 100039, peoples r china.;xia, pc (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;pcxia@imr.ac.cn
关键词	Dz951 Alloy Thermal Exposure Yield Stress Gamma' Phase Ni-base Superalloy Heat-treatment Mechanical-properties Microstructure Gtd-111 Alloy
URL	查看原文
WOS记录号	WOS:000247483800010
引用统计	被引频次：45[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/321006/33933
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	P. C. Xia,J. J. Yu,X. F. Sun,et al. Influence of themal exposure on gamma ' precipitation and tensile properties of DZ951 alloy[J]. Materials Characterization,2007,58(7):645-651.
APA	P. C. Xia,J. J. Yu,X. F. Sun,H. R. Guan,&Z. Q. Hu.(2007).Influence of themal exposure on gamma ' precipitation and tensile properties of DZ951 alloy.Materials Characterization,58(7),645-651.
MLA	P. C. Xia,et al."Influence of themal exposure on gamma ' precipitation and tensile properties of DZ951 alloy".Materials Characterization 58.7(2007):645-651.