成功地实现了珠光体钢65Mn的等径弯曲通道变形(ECAP),并研究在650℃不同ECAP变形道次的条件下渗碳体球化的演化过程.结果表明,渗碳体在ECAP热变形过程中表现出明显的加速球化特征.第一道次ECAP热变形后,片状的渗碳体演化为细小碎块的聚集体;第二道次热变形后,渗碳体实质上已破碎,呈现出颗粒状和球化渗碳体的主要形貌特征;第五道次ECAP热变形后,进一步演化为超细的球状渗碳体均匀分布于超细晶铁素体基体的组织.
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