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研究了30CrMnSiNi2A钢经高温预淬处理获得的粗大奥氏体晶界在再次热处理时的遗传现象及原因。研究表明,再次加热速度、温度及预处理方式均是影响晶界遗传程度的因素,其中再次加热速度影响最大。以不同速度加热时,原始晶界均有一定程度的遗传且在中速加热时最为明显。加热过程中在原晶界附近奥氏体形核方式、原晶界的迁移特性与合金元素在晶界及晶内的不同分布是决定晶界遗传与否的关键。
The genetic phenomena and reasons of the austenite grain boundaries in 30CrMnSiNi2A steel after preheat treatment at high temperature were studied again. The research shows that the reheating rate, temperature and pretreatment methods are the factors that affect the genetic degree of the grain boundary, of which the reheating rate has the greatest impact. When heated at different speeds, the original grain boundaries have a certain degree of inheritance and are most pronounced when heated at medium speed. During the heating process, the austenite nucleation mode near the original grain boundary, the migration characteristics of the original grain boundary and the different distribution of the alloying elements in the grain boundary and in the grain are the keys to determine the inheritance of grain boundaries.