摘要
研究了不同加热工艺参数下(加热温度1050~1300℃,保温时间0.25~24 h)12%Cr超超临界转子钢的奥氏体晶粒长大行为,并通过光学显微镜(OM)观察晶粒尺寸的变化规律,建立晶粒长大数学模型。结果表明:随着加热温度增加,晶粒尺寸逐渐增加,加热温度低于1150℃时,晶粒尺寸增加明显,而温度高于1150℃后,晶粒尺寸逐渐趋于稳定;随着保温时间的增加,晶粒尺寸逐渐增加,保温时间增加到3 h后,晶粒尺寸增加趋势放缓。采用非线性回归方法和Arrhenius晶粒长大模型,建立了该钢的晶粒长大数学模型。
Austenite grain growth behavior of 12% Cr ultra-supercritical rotor steel with different heating process parameters(heating temperature 1050-1300℃,holding time 0.25-24 h)was studied.The change rule of grain size was observed by optical microscope(OM),and the mathematical model of grain growth was established.The results show that with the increase of heating temperature,the grain size increases gradually.When the heating temperature is lower than 1150℃,the grain size increases obviously.When the temperature is higher than 1150℃,the grain size tends to be stable.With the increase of holding time,the grain size increases gradually,and when the holding time increases to 3 h,the increasing trend of grain size slows down.The mathematical model of grain growth under different heating process parameters is established by using nonlinear regression method and Arrhenius grain growth model.
作者
张学忠
刘建生
何文武
闫霄霞
杨春鹏
Zhang Xuezhong;Liu Jiansheng;He Wenwu;Yan Xiaoxia;Yang Chunpeng(College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan Shanxi 030024,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第9期77-80,共4页
Heat Treatment of Metals
基金
国家自然科学基金(51775361)
山西省研究生优秀创新项目(2018BY102)
太原科技大学博士启动基金(20172011)。
