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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。
The microstructure of 0.08% NbHTP (high temperature processing) austenite was investigated by light microscopy. The influence of processing parameters such as deformation temperature and deformation on the percentage of recrystallized austenite was analyzed. Obtained a deformed austenite experimental steel recrystallization map. The results show that the critical recrystallization temperature is 1070 ℃, the critical recrystallization temperature is 900 ℃ and the relative temperature of ordinary HSLA steel with 0.04% Nb is increased by 120 ℃ and 100 respectively when the deformation is 60% ℃, the performance of thermomechanical processing has been greatly improved, proved that the high content of Nb on the austenite strong recrystallization block.