摘要
本文研究了各种冶金因素对20Cr2Ni4A钢奥氏体晶粒长大的影响,并测得了各种条件下奥氏体晶粒的粗化温度。试验结果表明:①钢中酸溶铝量对奥氏体晶粒长大有最大的影响,奥氏体晶粒的粗化温度可相差200℃,②预处理工艺对粗化温度的影响可相差50～80~C,③最终加热时的加热速度对粗化温度有重要的影响,④20Cr2Ni4A钢有严重的组织遗传性,在采用高温固溶、低温析出工艺处理时,虽然可获得细小弥散分布的AlN颗粒,但在以后的慢速加热时,所形成的小角度针状奥氏体极易合并成粗晶,而出现部分和全部粗大晶粒的恢复。
This paper deals with the influences of various metallurgical factors on the austenite grain growth of 20Cr2Ni4A steel.The coarsening temperature of austenite grain under various conditions have been determined. The results show that(1)the acid soluted aluminium has the greatest influence on the austenite grain growth. It makes a coarsening temperature difference up to 200℃(2)the influence of conditioning process can make the difference in coarsening temperature of 50～80℃;(3)at final treatment, heat rate provides a importance effect on the coarsening temperature;(4)20Cr2Ni4A steel has severe structural inheritance.When the process of high temperature solid solution and low temperature precipitation is adopted, a finely dispersed AlN partical distribution can be attained, but the small angle acicular austenites formed at slow heating thereafter are easily to be aggregated to form coarse grain and the recovery of partly and whole coarse grain is appeared.
出处
《金属热处理》
CAS
CSCD
北大核心
1991年第7期32-37,共6页
Heat Treatment of Metals
