【摘要】 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。更多还原

【Abstract】 The ultra-refining of the austenitic grain in the Cr12MoV steel have been studied. The result shows that the ultrafine grains over 13 grade (ASTM)can be obtained by cyclic quenching at low temperature than reheating. The grain refining effects are not affected by the tempering at high temperature and the slow rate of heating at final quenching. The mechanism of the refining grain is that the areas of grain boundaries are increased when the cyclic quenching at low temperature and that "the effect of grain boundary" happens when reheating, thus the number of nuclei of austeaite will be much more.更多还原