18Ni马氏体时效钢加热过程晶粒长大模型  

Grain growth model of 18Ni maraging steel in heating process

作　　者：任永海[1] 赵飞[1,2] 严琰[1] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州省材料结构与强度重点实验室,贵州贵阳550025

出　　处：《材料热处理学报》2013年第9期90-94,共5页Transactions of Materials and Heat Treatment

基　　金：贵州省工业攻关项目(黔科合GY字(2011)3025)

摘　　要：研究了18Ni（1700MPa）马氏体时效钢加热一保温过程中晶粒长大的规律。通过回归分析建立了晶粒长大模型，同时验证了该模型的正确性。结果表明：在930～1070℃保温时，晶粒演变主要经历了逆变奥氏体再结晶孕育期、逆变奥氏体再结晶和二次长大3个阶段。在逆变奥氏体再结晶阶段，晶粒会发生明显的细化；在逆变奥氏体再结晶结束后的几十秒内，细化的晶粒将以较大速度发生二次长大，温度越高长大速度越快，但随着时间的延长，晶粒长大速度又会越来越慢。晶粒尺寸预测值与实测值吻合较好。Influence of heating temperature and holding time on the grain growth of 18Ni（ 1700 MPa） maraging steel were studied. The grain growth model of 18Ni maraging steel has been established by regression with experiment data and the applicability of the model is verified. The results show that grain evolution experiences three stages when holding at temperature of 930 - 1070℃： inverted austenitic reerystallization incubation period, inverted austenitic recrystallization process and reerystallized grain re-growing. The grain is refined obviously in recrystallization process. The refined grains will grow up again at a high speed after the tens of seconds of the recrystallization of reverted austenite, the higher temperature, the higher the grains growth rate, and the grains growing rate is reduced with the increase of holding time. The predictive and measured grain size coincides rather well.

关 键 词：18NI马氏体时效钢 晶粒长大模型 逆变奥氏体再结晶 

分 类 号：TG142.2[一般工业技术—材料科学与工程]