| 夹杂物对超高强度钢低周疲劳裂纹萌生及扩展影响的原位观测 |
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| 引用本文： | 王习术,梁锋,曾燕屏,谢锡善.夹杂物对超高强度钢低周疲劳裂纹萌生及扩展影响的原位观测[J].金属学报,2005,41(12):1272-1276. |
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| 作者姓名： | 王习术 梁锋 曾燕屏 谢锡善 |
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| 作者单位： | 1. 清华大学工程力学系,北京,100084
2. 北京科技大学材料科学与工程学院,北京,100083 |
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| 基金项目： | 国家重点基础研究发展规划项目2004CB619304及国家自然科学基金项目50571047资助 |
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| 摘 要： | 采用扫描电镜原位观测了数微米大小夹杂物对超高强度钢疲劳裂纹萌生及扩展的影响，并用有限元法解释了夹杂物尺寸和形状对疲劳裂纹萌生及初期扩展的影响程度，得到了超高强度钢低周疲劳裂纹萌生与扩展特性和夹杂物对疲劳破坏的关键尺寸的估计值．同时，讨论了现行实验方法对确定铁基材料裂纹扩展速率的作用．
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| 关 键 词： | 超高强度钢 夹杂物 疲劳裂纹萌生及扩展 原位观测 |
| 文章编号： | 0412-1961（2005）12-1272-05 |
| 收稿时间： | 2005-03-28 |
| 修稿时间： | 2005-03-282005-06-23 |
SEM IN SITU OBSERVATIONS TO THE EFFECTS OF INCLUSIONS ON INITIATION AND PROPAGATION OF THE LOW CYCLIC FATIGUE CRACK IN SUPER STRENGTH STEEL |
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| WANG Xishu,LIANG Feng,ZENG Yanping,XIE Xishan.SEM IN SITU OBSERVATIONS TO THE EFFECTS OF INCLUSIONS ON INITIATION AND PROPAGATION OF THE LOW CYCLIC FATIGUE CRACK IN SUPER STRENGTH STEEL[J].Acta Metallurgica Sinica,2005,41(12):1272-1276. |
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| Authors: | WANG Xishu LIANG Feng ZENG Yanping XIE Xishan |
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| Affiliation: | 1.Department of Engineering Mechanics, Tsinghua University, Beijing 100084;2.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 |
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| Abstract: | SEM in situ observations for the effects of inclusions on the fatigue crack initiation and propagation behaviors of super strength steel indicate that the inclusion size and shape affect not only on the fatigue crack initiation location but also on the crack growth behavior. At the same time, the effects of inclusions on the fatigue crack initiation are discussed by finite element method (FEM) analysis. The critical size of inclusion in low cyclic fatigue crack propagation is proposed and the influence of fatigue crack growth rate is estimated. |
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| Keywords: | super strength steel inclusion fatigue crack initiation and propagation SEM in situ observation |
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