Fatigue crack growth of DSX40M alloy at ambient and elevated temperatures

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	Fatigue crack growth of DSX40M alloy at ambient and elevated temperatures
	M. Ahmad; Y. B. Xu; G. Yao; Z. Q. Hu
	2002
发表期刊	Journal of Materials Science
ISSN	0022-2461
卷号	37 期号:11 页码:2279-2292
摘要	Fatigue crack propagation behaviour of compact tension specimens of DSX40M alloy has been investigated in air at room temperature and at 850degreesC. The results indicate that the crystallographic cracking occurs on two or more planes simultaneously at room temperature. Slip bands are observed along the crack. Crack growth is affected by the temperature. The fatigue crack growth is higher at elevated temperature than room temperature. Microcracks start at the precipitates/eutectic and join the fatal crack. The number of planes intersecting each other determines the different microscopic features on the cleavage fracture surface. Dislocation structure in the plastic zone underneath the crack propagation at room temperature and at 850degreesC has been investigated by transmission electron microscopy. Dislocation pile up starts at lower DeltaK and dislocations are moving in a planar slip and few of the dislocations form network in the final broken area at room temperature. At 850degreesC the dislocations are piling up at lower DeltaK and dislocations are dispersing and forming network at higher DeltaK. The complete network formation was observed in the final broken area at 850degreesC. The dislocation density is very much higher at 850degreesC compared to that at room temperature. (C) 2002 Kluwer Academic Publishers.
部门归属	pakistan inst nucl sci & technol, div nucl phys, radiat damage grp, islamabad, pakistan. acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china.;ahmad, m (reprint author), pakistan inst nucl sci & technol, div nucl phys, radiat damage grp, po nilore, islamabad, pakistan
关键词	Single-crystal
URL	查看原文
WOS记录号	WOS:000175448900012
引用统计	被引频次：3[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/321006/36226
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	M. Ahmad,Y. B. Xu,G. Yao,et al. Fatigue crack growth of DSX40M alloy at ambient and elevated temperatures[J]. Journal of Materials Science,2002,37(11):2279-2292.
APA	M. Ahmad,Y. B. Xu,G. Yao,&Z. Q. Hu.(2002).Fatigue crack growth of DSX40M alloy at ambient and elevated temperatures.Journal of Materials Science,37(11),2279-2292.
MLA	M. Ahmad,et al."Fatigue crack growth of DSX40M alloy at ambient and elevated temperatures".Journal of Materials Science 37.11(2002):2279-2292.