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在9Cr2Mo钢轧辊局部缺陷冷焊焊缝中，研究了焊态显微组织。经光镜观察及X射线荧光、电子探针、透射电镜等分析表明，在平均合碳量为0．65％～0．7％的高碳焊缝中，利用Nb，Ti，V及RE变质作用，可促进碳化物呈球块状大量弥散析出，造成基体的低碳成分，使焊缝室温组织为：低碳马氏体＋球块状碳化物＋少量残余奥氏体。这一组织在保证高硬度、高耐磨的条件下有利于改善焊缝韧性及抗裂性。
In the 9Cr2Mo steel cold rolling partial defects in the weld, the study of the weld microstructure. The results of microscopic observation, X-ray fluorescence, electron probe and transmission electron microscopy showed that the use of Nb, Ti, V and RE in the high-carbon weld with the average carbon content of 0.65% -0.7% The role of carbides can promote a large number of ball-like massive dispersion, resulting in the matrix of low-carbon components, the weld at room temperature for the organization: low carbon martensite + ball carbides + a small amount of residual austenite. This organization in ensuring high hardness, high wear-resistant conditions conducive to improving the weld toughness and crack resistance.