0.03Nb-0.15Ti微合金化低碳高强度钢的动态再结晶  

Dynamic Recrystallization of 0.03Nb-0.15Ti Microalloying Low-Carbon High-Strength Steel

作　　者：甘晓龙[1] 韩斌[1] 汪水泽[1] 蔡珍[1] 朱万军[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,武汉430080

出　　处：《特殊钢》2015年第5期51-54,共4页Special Steel

摘　　要：通过Gleeble 1500热模拟试验机试验研究了Nb-Ti微合金化低碳钢(/%:0.06C,0.22Si,1.80Mn,0.03Nb,0.15 Ti,≤0.007N,≤0.002S)10mm带钢在850~1100℃,以应变速率0.1~20.0 s^(-1),总变形量75%单道次压缩变形时动态再结晶,由真应力-真应变曲线,结合加工硬化率曲线,得出动态再结晶临界应变0.4~0.7和完全再结晶应变量1.1~1.4。该钢的热变形激活能为618.225 kJ/mol。根据试验结果得到Zener-Hollomon方程和动态再结晶状态图,利用Johnson-Mehl-Avrami(JMA)方程法得到再结晶体积分数实际值,采用Epsilon-P模型对实验数据进行回归,得到试验钢的再结晶动力学模型。The dynamic recrystallization of 10 mm strip of Nb-Ti microalloying low-carbon steel （/% ： 0. 06C, 0. 22Si, 1.80Mn, 0. 03Nb, 0. 15Ti, ≤0.007N, 40. 002S） in single pass compression with strain rate 0. 1 -20. 0 s-1 , total deformation 75% at 850 - 1 100 ℃ has been tested and studied by using Gleeble 1500 hot simulator. Based on true stresstrue strain curves combined work-hardening rate curve it is obtained that the dynamic recrystallization critical strain is O. 4 - 0. 7 and the complete recrystallization strain is 1.1 - 1.4. The hot deformation activation energy of steel is 618. 225 kJ/mol. And based on the Zener-Hollomon equation and dynamic reerystallization status diagram by tested results, it is obtained the dynamic model of recrystallization of test steel by using Johnson-Mehl-Avrami （JMA） equation method to get the real value of recrystallization volume fraction and by using Epsilon-P model to regress on the test data.

关 键 词：Nb—Ti微合金化 低碳高强度钢 动态再结晶 加工硬化率 动力学模型 

分 类 号：TG142.1[一般工业技术—材料科学与工程]