| ZG42CrMo缩松区疲劳裂纹的偏析和微裂纹的形成 |
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| 引用本文： | 赵芳欣,张瑛洁,张松,赵祖欣,尹绍奎,李德成.ZG42CrMo缩松区疲劳裂纹的偏析和微裂纹的形成[J].金属学报,1996,32(10):1056-1062. |
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| 作者姓名： | 赵芳欣 张瑛洁 张松 赵祖欣 尹绍奎 李德成 |
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| 作者单位： | 机械工业部沈阳铸造研究所，沈阳工业大学，东北大学 |
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| 摘 要： | 测定了ＺＧ４２ＣｒＭｏ高周疲劳裂纹扩展速率，对疲劳裂纹扩展过程进行了金相追踪观察．用ＥＰＭ研究了缩松及其表面微裂纹和硫化物的形态．用ＴＥＭ研究了裂纹顶端位错组态和滑移特征．讨论了缩松对裂纹捕获和偏折对疲劳裂纹扩展的双重影响及微裂纹萌生的可能机制．
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| 关 键 词： | ZG42CrMo，缩松，疲劳裂纹偏折，微裂纹 |
| 收稿时间： | 1996-10-18 |
| 修稿时间： | 1996-10-18 |
FATIGUE CRACK DEFLECTION AND FORMATION OF MICROCRACKS IN POROSITY AREA OF ZG42CrMo |
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| ZHAO Fangxin,ZHANG Yingjie,ZHANG Song,ZHAO Zuxin,YIN Shaokui,LI Decheng.FATIGUE CRACK DEFLECTION AND FORMATION OF MICROCRACKS IN POROSITY AREA OF ZG42CrMo[J].Acta Metallurgica Sinica,1996,32(10):1056-1062. |
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| Authors: | ZHAO Fangxin ZHANG Yingjie ZHANG Song ZHAO Zuxin YIN Shaokui LI Decheng |
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| Abstract: | The fatigue crack propagation rates of ZG42CrMo and its porosity area were measured.The process of fatigue crack growth in porosity area was observed by using metallographic tracing method.Dislocation and slip at the tip of fatigue crack have been studied by using TEM.The morphologies of porosities and microcracks together with sulphide on the surface of porosities were researched by using EPM.Two effects of porosities which make crack deflection and catch crack on fatigue crack growth have been discussed.Possible mechanism of microcrack initiation has been analysed. |
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| Keywords: | ZG42CrMo porosity fatigue crack deflection microcrack |
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