不同钒含量中碳非调质钢的奥氏体晶粒长大行为

Austenite grain growth behavior of medium carbon microalloyed forging steels with different vanadium contents

研究了两种V含量(0.15%、0.28%)的中碳非调质钢37Mn Si VS在不同奥氏体化加热温度和不同保温时间下的奥氏体晶粒长大规律。结果表明,随着加热温度的升高,实验钢的奥氏体晶粒近似呈指数形式长大;随保温时间的延长,实验钢的奥氏体晶粒呈抛物线形式长大。V含量的增加使得奥氏体晶粒细化,且出现急剧长大的温度升高,但V含量的增加对等温长大指数的影响较小。利用实测数据并结合晶粒长大动力学理论,并引入V含量作为变量,模拟得到了能够预测不同V含量的37Mn Si VS钢的奥氏体晶粒长大的数学模型。

The austenite grain growth behavior of medium carbon microalloyed forging steel 37 Mn Si VS with two different vanadium contents（ 0. 15% and 0. 28%） was investigated under different austenitizing temperatures and soaking time. The results show that the austenite grain of both steels grows up exponentially with the increase of reheating temperature,while austenite grains grow up in a parabolic way as the soaking time is prolonged. Austenite grain size decreases and its coarsening temperature increases sharply with the increase of vanadium content. However,the increase in vanadium content has little effect on the isothermal grain growth index. Measured data combined with the grain growth kinetics theory was used to establish a mathematical model which could predict the austenite grain growth behavior of steel 37 Mn Si VS with different vanadium contents successfully.