一种马氏体时效钢奥氏体晶粒长大动力学  

Kinetics of Austenite Grain Growth of Ultra-high Strength Steel

作　　者：陈俊杰[1,2] 王春旭[2] 刘宪民[2] 施哲[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《热加工工艺》2013年第2期154-156,160,共4页Hot Working Technology

摘　　要：在光学显微镜下,利用Leica Metal Work软件研究了一种强度级别为2100MPa的超高强度马氏体时效钢在850～1150℃的奥氏体晶粒长大规律。结果表明,实验钢奥氏体平均晶粒尺寸随加热温度升高和保温时间的延长而增大,其奥氏体平均晶粒尺寸与保温时间规律符合Beck方程,奥氏体化温度宜控制在800～950℃,其晶粒增长指数随温度的升高而减小,850～1150℃时实验钢奥氏体晶粒长大平均激活能为108.5 kJ/mol-1,并建立了实验钢在等温加热过程中的奥氏体晶粒长大方程。The growth law of austenite grain growth of a ultra-high strength maraging steel which has a 2100 MPa tensile strength was studied by Leica Metal Work at 850-1150 C under optical microscope. The results show that the average austenite grain size of the experimental steel increases with the increase of heating temperature and holding time, the growth of austenite grain follows the Beck＇s relationship, and the optimum austenitizing temperature is 800-950 ＂C. The grain growth index decreases with the increase of temperature, the average activation energy of austenite grain growth of the experimental steel is about 108.5 kJ/mol-~ at 850-1150 ~C, and the equation of austenite grain growth in isothermal heating process was established.

关 键 词：超高强度钢 时效 晶粒长大 激活能 

分 类 号：TG142.42[一般工业技术—材料科学与工程]