核电用SA508-3钢的奥氏体晶粒生长过程模拟  

Modeling of Austenite Grain Growth of Nuclear Pressure Vessel SA508-3 Steel

作　　者：董定乾[1] 崔振山[1] 陈飞[1] 

机构地区：[1]上海交通大学模具CAD国家工程研究中心,上海200030

出　　处：《上海交通大学学报》2015年第10期1504-1509,共6页Journal of Shanghai Jiaotong University

基　　金：国家重点基础研究发展规划(973)项目(2011CB012903);国家重大科技专项课题(2012ZX04012-011)资助

摘　　要：将核电用SA508-3钢试样分别在温度900~1 250°C下加热0~300min进行奥氏体化热处理,测量处理后的奥氏体晶粒直径,对奥氏体晶粒的生长规律进行研究,同时,通过回归实验数据建立了描述晶粒生长过程的动力学模型.结果表明：奥氏体晶粒直径随加热温度升高而呈现出抛物线形状的变化特征;随着保温时间的延长,其变化规律趋近于双曲线形状;当加热温度为900~1 050°C时,奥氏体晶粒的生长速度较慢;当加热温度在1 050~1 250°C时,奥氏体晶粒的生长速度显著增大;所建数学模型的计算值与实验结果较吻合,能够反映不同温度下的晶粒生长规律.The kinetic law of austenite grain growth in nuclear pressure vessel SA508-3steel was studied by quantitatively measurement of the austenite grain diameter after being austenitized from 900°C to 1 250°C with a holding time from 0to 300 min.The results exhibit that the austenitic grain diameter increases significantly with the increasing heating temperature.The relationship between grain diameter and heating temperature is in the form of a parabola.The austenite grains gradually increase with the increase in holding time and its trend approximates in a hyperbolic a way.When the heating temperature is between 900 and 1 050°C austenitic grains grow with the increase of the holding time but the grain growth is slow.However,when the heating temperature is between 1 050 and 1 250°C,the grain growth significantly increases.The comparison of the prediction results obtained by the developed kinetics equation with the experimental results suggests that the established mathematical models can reflect the changing rule of grain growth within the test temperatures range.

关 键 词：SA508-3钢 热成形 奥氏体 晶粒生长 

分 类 号：TG113.1[金属学及工艺—物理冶金]