Effect of heating parameters on grain growth behavior of 12%Cr steel

doi:10.13251/j.issn.0254-6051.2020.09.013

Abstract

Abstract: 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.

Key words: 12%Cr rotor steel, austenite grain, grain growth behavior, grain growth model

CLC Number:

Zhang Xuezhong, Liu Jiansheng, He Wenwu, Yan Xiaoxia, Yang Chunpeng. Effect of heating parameters on grain growth behavior of 12%Cr steel[J]. Heat Treatment of Metals, 2020, 45(9): 77-80.

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