| Cr-Mn-Si-Ni高强度钢疲劳裂纹的萌生行为 |
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| 引用本文： | 黄新跃,吴学仁,徐曼琼,李旭东,曲士昱,刘天琦. Cr-Mn-Si-Ni高强度钢疲劳裂纹的萌生行为[J]. 失效分析与预防, 2010, 5(3): 140-144. DOI: 10.3969/j.issn.1673-6214.2010.03.003 |
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| 作者姓名： | 黄新跃 吴学仁 徐曼琼 李旭东 曲士昱 刘天琦 |
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| 作者单位： | 1. 北京航空材料研究院,北京,100095
2. 清华大学,航天航空学院,北京,100084 |
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| 摘 要： | 通过扫描电镜原位疲劳试验,研究Cr-Mn-Si-Ni高强度钢疲劳裂纹的萌生行为,观察并记录从滑移带自然萌生的小裂纹和其发展到宏观裂纹的过程。研究结果表明：在低周疲劳情况下,不是所有萌生的裂纹都会持续扩展,大部分微裂纹在疲劳早期即已萌生,但是裂纹发展很慢,导致失效的裂纹快速扩展在疲劳晚期发生,微裂纹长度与循环数之间也有一定的关系。
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| 关 键 词： | 疲劳微裂纹 原位试验 结构钢 |
Fatigue Crack Initiation Behavior of Cr-Mn-Si-Ni Steel |
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| HUANG Xin-yue,WU Xue-ren,XU Man-qiong,LI Xu-dong,QU Shi-yu,LIU Tian-qi. Fatigue Crack Initiation Behavior of Cr-Mn-Si-Ni Steel[J]. Failure Analysis and Prevention, 2010, 5(3): 140-144. DOI: 10.3969/j.issn.1673-6214.2010.03.003 |
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| Authors: | HUANG Xin-yue WU Xue-ren XU Man-qiong LI Xu-dong QU Shi-yu LIU Tian-qi |
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| Affiliation: | 1.Beijing Institute of Aeronautical Materials,Beijing 100095,China;2.College of Astronautics and Aeronautics,Tsinghua University,Beijing 100084,China) |
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| Abstract: | The fatigue crack initiation behavior of a Cr-Mn-Si-Ni high strength steel was studied through scanning electronic microscope（SEM）in-situ fatigue tests.The evolution process of macrocrack formation from naturally nucleated microcracks was recorded.From the observation on specimen surface,it was found that the microcracks nucleated at the early fatigue stage do not propagate much during most fatigue life.The macrocrack formation and fast propagation occur at the quite late fatigue stage.The relationship between microcrack length and cycle number was given. |
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| Keywords: | fatigue microcrack in-situ test structural steels |
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