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基于Nb,Ti和V含量不同的6种低碳含Nb微合金钢的热模拟实验数据,利用硬化速率-应力(θ-σ)曲线,准确确定了其发生动态再结晶的临界应变ε_c、峰值应变ε_p、临界应力σ_c、峰值应力σ_p和稳态应力σ_(ss)值.结果表明,峰值应力σ_p随Nb,Ti和V含量的增加而增大,6种实验钢发生动态再结晶的ε_c/ε_p的取值范围为0.50—0.65.采用σ-ε曲线法计算获得了动态再结晶的Avrami动力学曲线,与采用金相方法得到的动态再结晶动力学曲线比较接近.随着钢中Nb和Ti含量增加,动态再结晶的Avrami动力学曲线右移;Nb微合金钢中复合添加Ti和V则导致在更低的应变速率下才能发生动态再结晶.
Based on the thermal simulation data of six kinds of low carbon Nb microalloyed steels with different contents of Nb, Ti and V, the critical strain ε_c of dynamic recrystallization was accurately determined by using the hardening rate-stress (θ-σ) curve. The peak Strain ε_p, critical stress σ_c, peak stress σ_p and steady-state stress σ_ (ss) .The results show that the peak stress σ_p increases with the increase of Nb, Ti and V. The dynamic recrystallization ε_c / ε_p is in the range of 0.50-0.65. The dynamic recrystallization Avrami kinetics curve obtained by σ-ε curve method is close to the dynamic recrystallization kinetics curve obtained by the metallographic method. With the increase of Nb and The Ti content increases and the dynamic recrystallization Avrami kinetic curve shifts to the right. The addition of Ti and V in Nb microalloyed steels leads to dynamic recrystallization at lower strain rates.