Low cycle fatigue behavior of a directionally solidified cobalt base superalloy
文献类型：期刊论文
| 作者 | Z. Lu ; Y. B. Xu ; Z. Q. Hu |
| 刊名 | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
 |
| 出版日期 | 1999 |
| 卷号 | 270期号:2页码:162-169 |
| 关键词 | cobalt-base superalloy hardening saturation stacking fault intersection precipitate amplitude copper metals |
| ISSN号 | 0921-5093 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/37444]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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