本文研究了Cr12MoV钢超细奧氏体晶粒的获得及其工艺问题。结果表明,Cr12MoV钢经低温循环淬火,再加热时,可得到13级以上的超细晶粒,低温循环淬火组织,经高温回火软化及终处理时的缓慢加热,均对晶粒细化效果没有影响。晶粒细化的机制在于低温循环淬火增加了晶界面积以及再加热时发生“晶粒边界效应”,从而大大提高了奧氏体的形核率。 In this paper, the obtaining of ultrafine austenite grains of Cr12MoV steel and its technological problems are studied. The results show that when the Cr12MoV steel is quenched at low temperature and then reheated, the ultrafine grain and low temperature cyclic quenched structure with more than 13 grades can be obtained. After being tempered at high temperature and softened and slowly heated at the final treatment, the grain refinement effect No effect. The mechanism of grain refinement is that the low-temperature cycle quenching increases the grain boundary area and “grain boundary effect” occurs when reheating, thereby greatly increasing the nucleation rate of austenite.