研究了6Cr21Mn10MoVNbN气阀钢在1 000℃到1 250℃固溶处理时的晶粒长大规律,并分析了等温固溶时晶粒长大的动力学.结果表明,弥散分布的碳氮化物对晶粒长大有显著阻碍作用,在低于该钢的晶粒粗化温度(1150℃)固溶处理时,大量未溶解的碳氮化物使得晶粒尺寸增幅较小、洛氏硬度小幅下降;在高于1150℃时,随温度的升高或时间延长,晶粒长大迅速,洛氏硬度大幅下降;晶粒生长指数随固溶温度的升高而呈台阶式增长;在固溶温度为1 050～1100℃下的晶粒长大激活能为189.9 kJ/mol,晶粒长大机理为自扩散过程控制机理,并建立了相应的晶粒长大动力学方程.
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