| 碳氮共渗层残留奥氏体对疲劳裂纹扩展抗力的影响 |
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| 引用本文： | 蔡恒丰 沈甫法. 碳氮共渗层残留奥氏体对疲劳裂纹扩展抗力的影响[J]. 上海交通大学学报, 1996, 30(3): 145-150 |
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| 作者姓名： | 蔡恒丰 沈甫法 |
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| 摘 要： | 采用表面裂纹法研究了残留奥氏体在碳氮共渗层中疲劳裂纹的扩展行为，证实残留奥氏体在疲劳裂纹扩展过程中会形成应变诱发马氏体，从而导致疲劳裂纹扩展速率明显降低．通过裂纹前端塑性区的能量估算，指出上述现象是由于应变诱发马氏体时吸收大量能量的结果．
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| 关 键 词： | 残余奥氏体；马氏体相变；疲劳断裂；碳氮共渗 |
Influence of Retained Austenite in Carbonitriding Cases on Resistance to Propagation of Fatigue Crack |
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| Zheng Jinghong, Cai Hengfeng, Shen Fufa, Yu Degang. Influence of Retained Austenite in Carbonitriding Cases on Resistance to Propagation of Fatigue Crack[J]. Journal of Shanghai Jiaotong University, 1996, 30(3): 145-150 |
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| Authors: | Zheng Jinghong Cai Hengfeng Shen Fufa Yu Degang |
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| Affiliation: | Department of Material Science |
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| Abstract: | The investigations in this research aimed to assess the effects of retained austenite in the cases of carbonitriding on the resistance to the propagation of fatigue crack of 20CrMnMo steel by means of the surface-flawed testing method. The results verified that some of the retained austenite in the cases was transformed into strain-induced martensite and as a result, the rate of fatigue crack growth dc/dN diminished remarkably. This transformation, by estimating the energy within the plastic zone in the crack tip, would consume most of the total energy absorbed by the propagation of the crack. |
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| Keywords: | retained austenite martensite transformation fatigue fracture carbonitriding |
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