| 稀土相与表面处理对Ti-60钛合金疲劳源的影响 |
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| 引用本文： | 高玉魁,吴学仁,陆峰,李臻熙,姚枚.稀土相与表面处理对Ti-60钛合金疲劳源的影响[J].材料热处理学报,2005,26(5):72-75. |
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| 作者姓名： | 高玉魁 吴学仁 陆峰 李臻熙 姚枚 |
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| 作者单位： | 北京航空材料研究院,北京,100095;燕山大学材料学院,秦皇岛,066004 |
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| 摘 要： | 对Ti-60高温钛合金的疲劳断口进行了扫描电镜（SEM）、二次电子像（SEI）背散射电子像（BEI）分析，根据疲劳裂纹源所在位置的不同研究了Ti-60高温钛合金的疲劳裂纹源位置。结果表明，疲劳裂纹源在表面未强化试样表面稀土相处萌生，而对表面强化试样而言，疲劳裂纹源在表面强化层下稀土相处或滑放区萌生。用疲劳裂纹萌生的微细观过程理论对疲劳裂纹萌生的条件及疲劳强度的影响进行了分析。
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| 关 键 词： | 高温钛合金 疲劳裂纹源 稀土相 |
| 文章编号： | 1009-6264（2005）05-0072-04 |
| 收稿时间： | 2004-12-06 |
| 修稿时间： | 2004-12-062005-02-21 |
Influence of Rare Earth Phase and Surface Treatment on Location of Fatigue Crack Source of Ti-60 High-temperature Titanium Alloy |
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| GAO Yu-kui,WU Xue-ren,LU Feng,LI Zhen-xi,YAO Mei.Influence of Rare Earth Phase and Surface Treatment on Location of Fatigue Crack Source of Ti-60 High-temperature Titanium Alloy[J].Transactions of Materials and Heat Treatment,2005,26(5):72-75. |
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| Authors: | GAO Yu-kui WU Xue-ren LU Feng LI Zhen-xi YAO Mei |
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| Affiliation: | GAO Yu-kui~1,WU Xue-ren~1,LU Feng~1,LI Zhen-xi~1,YAO Mei~2 |
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| Abstract: | Ti-60 high-temperature titanium alloy was used to determine the location of fatigue crack source by second electron image(SEI) and back electron image(BEI) technique in scanning electron microscopy. The experimental results show that the fatigue crack source is located either in rare earth phase at surface for unpeened specimens or in rare earth phase and slip zone beneath surface for shot-peened specimens. Based on a microscopic-and-mesoscopic process theory of fatigue crack initiation, the effect of location of fatigue crack source on fatigue property is discussed and the location of fatigue crack source is determined by local effective applied stress and material yield strength. |
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| Keywords: | high-temperature titanium alloy fatigue crack source rare earth phase |
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