Low cycle fatigue behavior of a directionally solidified cobalt base superalloy

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	Low cycle fatigue behavior of a directionally solidified cobalt base superalloy
	Z. Lu; Y. B. Xu; Z. Q. Hu
	1999
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	270 期号:2 页码:162-169
摘要	An investigation has been made of the low cycle fatigue behavior and microstructure evolution of a directionally solidified cobalt-base superalloy at room temperature, 700 and 850 degrees C under the control of different total strain amplitudes. The results show that at room temperature the cyclic hardening of the alloy appears during the first few cycles, and then a long saturation stage begins. At 700 degrees C, the alloy exhibits a pronounced initial hardening, and a secondary hardening after a short saturation. At 850 degrees C. the alloy shows a continuous cyclic hardening until fracture. Examination by TEM indicates that the initial hardening of the alloy at room temperature is caused by the pile-ups of the stacking faults at the stacking fault intersections, while the saturation is related to the formation of the hexagonal close-packed (HCP) zones and twins. The mechanism of initial hardening at 700 degrees C is similar to that at room temperature, while the stress saturation is due to interaction obstacle to stacking-fault becoming weaker, because of thermal activation. The secondary hardening is attributed to the formation of sessile dislocation tangles. The continuous cyclic hardening at 850 degrees C is related to the interaction between the precipitates (M23C6) and dislocations. (C) 1999 Published by Elsevier Science S.A. All rights reserved.
部门归属	acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china.;lu, z (reprint author), univ erlangen nurnberg, inst werkstoffwissensch 1, matenstr 5, d-91058 erlangen, germany
关键词	Cobalt-base Superalloy Hardening Saturation Stacking Fault Intersection Precipitate Amplitude Copper Metals
URL	查看原文
WOS记录号	WOS:000083046500007
引用统计	被引频次：8[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/321006/37444
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Lu,Y. B. Xu,Z. Q. Hu. Low cycle fatigue behavior of a directionally solidified cobalt base superalloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,1999,270(2):162-169.
APA	Z. Lu,Y. B. Xu,&Z. Q. Hu.(1999).Low cycle fatigue behavior of a directionally solidified cobalt base superalloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,270(2),162-169.
MLA	Z. Lu,et al."Low cycle fatigue behavior of a directionally solidified cobalt base superalloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 270.2(1999):162-169.