低碳微合金钢再加热奥氏体化后奥氏体晶粒长大行为  

Growth behavior of austenite grain upon re-austenizing of low carbon microalloyed steel

作　　者：李文竹[1] 黄磊[1] 严平沅[1] 马惠霞[1] 庞兆夫[1] 

机构地区：[1]鞍钢股份有限公司技术中心,辽宁鞍山114009

出　　处：《金属热处理》2013年第4期19-22,共4页Heat Treatment of Metals

摘　　要：通过金相显微分析方法研究了3种不同成分的低碳微合金钢再加热奥氏体化后晶粒粗化行为,探讨了第二相粒子对奥氏体晶粒的钉扎作用。结果表明:3种钢的粗化温度分别为:A钢1100℃,B和C钢为1050℃。在900～1000℃,第二相粒子数量较多,奥氏体晶界几乎被完全钉扎,奥氏体晶粒的粗化速率较低。温度继续升高,第二相粒子数量下降,奥氏体晶粒开始异常长大。The growth behavior of austenite grain of three kinds low carbon microalloyed steels was studied by means of microscopic： analysis method. Meanwhile, pinning effect of the second-phase particles on the auslenite grain boundary was approached. The results indicate thai the grain-coarsening temperature is about 1100 ℃, 1050 ℃ and 1050 ℃ for A, B and C steel respectively. When heating between 900 ℃and 1000 ℃ , a Int of second-phase particles remain, and abnost all austenite grain boundary is pinned tightly, which prevents austenite grain from coarsening. With the increase of temperature, the second-phase particles decrease, therefore, the austenite grain grows rapidly.

关 键 词：奥氏体化温度 粗化温度 再加热 第二相粒子 

分 类 号：TG142.1[一般工业技术—材料科学与工程]