| 激光冲击强化ZCuAl10Fe3Mn2合金的热疲劳裂纹生长行为 |
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| 引用本文： | 刘光磊,曹宇豪,杨坤,郭伟,孙小轩,赵玲,司乃潮,周建忠.激光冲击强化ZCuAl10Fe3Mn2合金的热疲劳裂纹生长行为[J].中国有色金属学会会刊,2021,31(4):1023-1030. |
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| 作者姓名： | 刘光磊 曹宇豪 杨坤 郭伟 孙小轩 赵玲 司乃潮 周建忠 |
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| 作者单位： | 江苏大学材料科学与工程学院;江苏大学机械工程学院 |
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| 基金项目： | financial supports from the National Natural Science Foundation of China—Youth Project (51801076);the Provincial Colleges and Universities Natural Science Research Project of Jiangsu Province (18KJB430009),China;the Postdoctoral Research Support Project of Jiangsu Province (1601055C),China;the Senior Talents Research Startup of Jiangsu University (14JDG126),China。 |
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| 摘 要： | 为了提高高温构件的热疲劳性能、减少表面裂纹,研究激光冲击对ZCuAl10Fe3Mn2合金硬度、表面形貌、残余应力和热疲劳性能的影响。采用扫描电子显微镜(SEM)和能谱仪(EDS)分析合金的显微组织和裂纹形貌。结果表明:在4 J脉冲能量下,激光冲击能显著改善合金的热疲劳性能。在热应力和交变应力的作用下,试样缺口附近组织氧化而变得疏松多孔,促使萌生多条微裂纹。其中,竖直方向的微裂纹变为主裂纹,主要以裂尖前沿空洞连体的形式扩展;其他方向的微裂纹沿晶界生长而发生组织脱落现象。
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| 关 键 词： | 铜合金 激光冲击强化 表面形貌 热疲劳性能 裂纹萌生 裂纹扩展 |
| 收稿时间： | 6 May 2020 |
Thermal fatigue crack growth behavior of ZCuAl10Fe3Mn2 alloy strengthened by laser shock processing |
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| Guang-lei LIU,Yu-hao CAO,Kun YANG,Wei GUO,Xiao-xuan SUN,Ling ZHAO,Nai-chao SI,Jian-zhong ZHOU.Thermal fatigue crack growth behavior of ZCuAl10Fe3Mn2 alloy strengthened by laser shock processing[J].Transactions of Nonferrous Metals Society of China,2021,31(4):1023-1030. |
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| Authors: | Guang-lei LIU Yu-hao CAO Kun YANG Wei GUO Xiao-xuan SUN Ling ZHAO Nai-chao SI Jian-zhong ZHOU |
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| Affiliation: | 1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;2. School of Mechanical Engineering, Jiangsu University, Zhenjiang 2120013, China |
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| Abstract: | The effect of laser shock processing (LSP) on the hardness, surface morphology, residual stress, and thermal fatigue properties of a ZCuAl10Fe3Mn2 alloy was investigated to improve the thermal fatigue performance and decrease the surface crack of high-temperature components. The microstructure and crack morphology were analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that laser shock could significantly improve the thermal fatigue performance of the alloy at a pulse energy of 4 J. Under the effect of thermal stress and alternating stress, microstructure around the specimen notch was oxidized and became porous, leading to the formation of multiple micro-cracks. The micro-cracks in the vertical direction became the main cracks, which mainly expanded with the conjoining of contiguous voids at the crack tip front. Micro-cracks in other directions grew along the grain boundaries and led to material shedding. |
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| Keywords: | copper alloy laser shock strengthening surface morphology thermal fatigue properties crack initiation crack propagation |
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