为研究钒氮钢的显微组织细化机制,采用扫描电镜及能谱仪分析了夹杂物类型及尺寸,建立了基于夹杂物形核的晶内铁素体等温长大模型.基于此模型计算了钒氨钢奥氏体化后在873 K及823 K等温不同时间产生的晶内铁素体体积分数,并与金相显微镜的实测结果进行了对比分析.结果表明:模型能较好地描述晶内铁素体长大规律;相同等温时间,873 K形成的晶内铁紊体体积分数高于823 K的;随转变温度降低,晶内铁素体体积分数计算值小于实测值,主要原因在于随温度降低,VN或V(C,N)不仅在MnS上析出量增多,而且也在MnS之外析出并成为晶内体素体核心.
参考文献
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