HTP高铌钢形变奥氏体再结晶规律研究

Study of austenite recrystallization of high Nb HTP steel

采用阶梯试样,通过光镜观察,研究了0.08%NbHTP(High temperature processing)钢形变奥氏体再结晶规律,分析了变形温度、变形量等工艺参数对变形奥氏体再结晶百分数的影响,得出了实验钢变形奥氏体再结晶图。结果表明,变形量为60%时,试验钢的完全再结晶临界温度为1070℃,未再结晶临界温度为900℃,分别比含Nb0.04%的普通HSLA钢相应温度提高了120℃和100℃,热机械加工性能得到大幅度提高,证明了高含量Nb对奥氏体再结晶的强烈阻滞作用。

Through adopting the stepped test piece, analysed by optical microscope, the influence of the parameters including rolling temperature and reduction on the recrystallization fraction of 0. 08% Nb HTP steel deformed austenite was studied, the deformed austenite recrystallization figure of the test steel was obtained. The result indicates, the static recrystallization temperature of HTP steel is above 100℃ higher than common HSLA steel, HTP steel has better heat process performance; high content Nb has great function of holding back recrystallization.