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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．
The crack growth behavior of retained austenite in carbonitrided layer was studied by surface crack method. It was confirmed that residual austenite formed strain-induced martensite during the fatigue crack propagation, resulting in a significant decrease of fatigue crack growth rate . Through the energy estimation of the plastic zone in the front of the crack, it is pointed out that the above phenomenon is the result of absorbing a large amount of energy due to strain-induced martensite.