低碳含铌钢粗大奥氏体的静态再结晶

Static recrystailization in low-carbon niobium-microalloyed steels with coarse austenite

摘要: 利用Gleeble1500热模拟机研究了Nb质量分数0.089%的高温热机械轧制钢(4^# Nb钢)在粗大奥氏体晶粒条件下的静态再结晶规律.作为对比,同时研究了一种铌质量分数0.049%的低碳含铌钢(2^# Nb钢)的静态再结晶规律.实验结果表明:4^# Nb钢的静态再结晶动力学过程比2^# Nb钢慢,在高温时差异较小;随着形变温度的降低,4^# Nb钢的静态再结晶动力学被极大地延迟.根据实验数据建立了静态再结晶模型,该模型对轧制工艺的制定有一定的指导意义.

Abstract: The static recrystallization behavior of a high temperature processing (HTP) steel containing 0.08% Nb (4^#Nb steel) with coarse austenite was investigated by using a thermo-mechanical simulator Gleeble 1500. A low carbon steel containing 0. 049% Nb (2^# Nb steel) was also studied as a comparison. The results indicate that the static recrystallization kinetics process of 4^# Nb steel is slightly slower than that of 2^# Nb steel at high deformation temperature. The recrystallization of 4^# Nb steel is greatly retarded with decreasing deformation temperature. According to experimental data, a mathematical model of static recrystaUization was developed, which can provide theoretical guidance for designing the industrial rolling procedure.