| Thermal fatigue behavior of K465 superalloy |
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| 作者姓名： | YANG Jinxia ZHENG Qi SUN Xiaofeng GUAN Hengrong HU Zhuangqi |
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| 作者单位： | Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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| 摘 要： | The thermal fatigue behavior of K465 superalloy was investigated at the peak temperature of 1050℃. By scanning electron microscopy （SEM） and optical microscopy, the main crack length was observed and measured. The initiation sites of the tested alloys are different in as-cast （named as K465） and solution heat treatment （named as SK465） conditions. In K465 alloy, most thermal fatigue cracks nucleate at （Nb,W,Ti）C carbides. In SK465 alloy, thermal fatigue cracks initiate in interdendritic regions, MC-type carbides and some interfaces. Thermal fatigue cracks propagate in transdendritic mode, and M6C-type carbides could retard thermal fatigue crack growth for SK465 superalloy.
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| 关 键 词： | K465高温合金 热疲劳 裂纹萌生 裂纹发展 碳化物 |
| 收稿时间： | 2005-06-20 |
Thermal fatigue behavior of K465 superalloy |
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| YANG Jinxia ZHENG Qi SUN Xiaofeng GUAN Hengrong HU Zhuangqi.Thermal fatigue behavior of K465 superalloy[J].Rare Metals,2006,25(3):202-209. |
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| Authors: | YANG Jinxia ZHENG Qi SUN Xiaofeng GUAN Hengrong HU Zhuangqi |
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| Affiliation: | 1. Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, NC 27695-7908, United States;2. Honeywell Aerospace, Phoenix, AZ 85034, United States;1. Shenyang University of Technology, Shenyang 110870, China;2. Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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| Abstract: | The thermal fatigue behavior of K465 superalloy was investigated at the peak temperature of 1050℃. By scanning electron microscopy (SEM) and optical microscopy, the main crack length was observed and measured. The initiation sites of the tested alloys are different in as-cast (named as K465) and solution heat treatment (named as SK465) conditions.In K465 alloy, most thermal fatigue cracks nucleate at (Nb,W,Ti)C carbides. In SK465 alloy, thermal fatigue cracks initiate in interdendritic regions, MC-type carbides and some interfaces. Thermal fatigue cracks propagate in transdendritic mode,and M6C-type carbides could retard thermal fatigue crack growth for SK465 superalloy. |
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| Keywords: | K465 superalloy thermal fatigue crack initiation and growth carbides |
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