长时保温条件下316LN不锈钢奥氏体晶粒的变化规律

Change law of austenitic grain for 316LN steel under long heat preservation

基于理化检测分析,研究了316LN钢在不同加热温度下长时间保温的晶粒度变化规律。对试验数据进行了非线性回归,建立了描述316LN钢奥氏体晶粒度长时保温条件下的长大规律模型。结果表明,在1150℃以下,保温时间从10 h到50 h,晶粒尺寸缓慢长大;1150℃以上,保温时间从10 h到50 h,晶粒尺寸长大速度加快。通过对比试验值与模型预测值,发现拟合尺寸与实际尺寸符合度较好,验证了模型的精度。

Based on the analysis of physical and chemical testing,the law of the variation of grain size of 316 LN steel under different heating temperature and long time preservation was studied. The model of the growth-up law f austenitic grain size of 316 LN steel was established by means of nonlinear regression of the experimental data. The results show that the grain of the steel slowly grows up. The grain grows up faster above 1150 ℃ when holding the same duration of time. By comparing the experimental data and model prediction,it is found that the calculated size and actual size fit well,and therefore,the precision of the models is verificated.