| 中碳合金钢双相组织疲劳裂纹扩展的研究 |
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| 引用本文： | 武小雷 刘会亭. 中碳合金钢双相组织疲劳裂纹扩展的研究[J]. 材料科学与工艺, 1994, 2(3): 40-45 |
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| 作者姓名： | 武小雷 刘会亭 |
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| 作者单位： | 西北工业大学，太原工业大学 |
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| 摘 要： | 研究了４２ＣｒＭｏ钢亚温淬火及二次淬火两种双相组织的疲劳裂纹扩展行为。结果表明，亚温淬火双相组织可显著提高裂纹萌发生抗力，降低扩展速率；较高的疲劳性能与裂纹尖端闭合应力，断口表面粗糙度以及裂纹扩展路径弯折程度有关。断裂力学分析表明，粗糙度诱发裂纹闭合效应及裂纹路径变折效应是提高裂纹扩展抗力的主要因素，同时得到上述两种效应对裂纹扩展速率影响的表达式。
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| 关 键 词： | 双相组织 裂纹扩展 中碳合金钢 |
Study on Fatigue Crack Propagation of Dual-Phase Structure |
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| Wu Xiaolei,Liu Huitin, Huang Yuan,Hou Zhenshou. Study on Fatigue Crack Propagation of Dual-Phase Structure[J]. Materials Science and Technology, 1994, 2(3): 40-45 |
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| Authors: | Wu Xiaolei Liu Huitin Huang Yuan Hou Zhenshou |
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| Affiliation: | Wu Xiaolei;Liu Huitin; Huang Yuan;Hou Zhenshou(Northwestern Polytech. Univ.)(Taiyuan Univ.of Tech.) |
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| Abstract: | The fatigue crack propagation of dual-phase microstructures was investigated in 42CrMo steel. The results showed that the dual-phase structures could significantly increase the crack initiation and propagation time and decrease the propagation rate.The high fatigue properties were found to be related with higher crack closure stress,rough fracture surface and tortuousity of crack path. Based on the analysis of fatigue fracture mechanism,it was concluded that the superior fatigue crack growth resistance of the dualphase structure was attributed to the roughness-induced crack closure effect and deflection effect as well, which reduced the effective driving force at the crack tip. |
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| Keywords: | dual-phase structure fatigue mechanism crack propagation closure effect |
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