为了深入研究MC5冷轧辊钢奥氏体化过程中碳化物的演变规律，采用扫描电镜、X射线衍射分析和硬度测试技术，研究了不同奥氏体化时间对MC5钢组织和硬度的影响。结果表明，奥氏体化时间从0增加到2 h时，随着奥氏体化时间的增加，试样的淬火硬度先陡然增加，后趋于平缓；当奥氏体化时间增加到4h时，随着奥氏体化时间的增加，试样的淬火硬度有减小的趋势。对奥氏体化时间为30 min、1和2 h的试样进行微观统计和XRD分析，发现奥氏体化时间为30 min时，试样的碳化物分布最为弥散，数量最多，尺寸最为细小，其类型主要为M7 C3型。
To study carbide dynamic evolution law in the process of austenitizing further, the influence of different austenitizing time on microstructure and hardness were studied using scanning electron microscopy ( SEM) , X-ray diffraction analysis and hardness test. The results show that, as the austenitizing time increases from 0 to 2 h, the quenching hardness of samples increases greatly at first, and then tends to be gentle. When the austenitizing time increases to 4 h, the quenching hardness of samples tends to decrease as the austenitizing time continues to increase. Micro statistical analysis and XRD analysis indicate that when the austenitizing time is about 30 min, the carbides of sample are the most dispersively distributed, the amount of the carbides is the largest and the carbide size is also the finest, and the type of carbide is mainly M7 C3 .
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