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在９Ｃｒ２Ｍｏ轧辊局部冷焊焊缝中，研究了焊缝服役后的疲劳现象与残余奥氏体（ＡＲ）数量、形态的关系．结果表明：块状ＡＲ是焊缝早期疲劳的主要原因；其疲劳机制是块状ＡＲ塑变切断破坏和高应力诱发相变孪晶．强碳化物形成元素与Ｃ符合定比规律后，固溶入基体的弱、非碳化物元素影响着ＡＲ的数量和形态．薄膜状ＡＲ与板条马氏体（ＭＬ）形成的ＭＬ／ＡＲ束，可显著提高冷轧抗疲劳性．
In the 9Cr2Mo roll cold weld locally, the relationship between fatigue and residual austenite (AR) after welding service was studied. The results show that the massive AR is the main cause of early fatigue of the weld, and the fatigue mechanism is the fracture deformation and the high stress-induced twinning induced by the massive AR plastic deformation. The formation of strong carbide and C consistent with the law, the solid solution into the matrix of weak, non-carbide elements affect the number and morphology of AR. The ML / AR bundles formed by film-like AR and lath martensite (ML) significantly improve cold rolling fatigue resistance.