基于加工硬化率的铸态Q235B钢法兰坯动态再结晶及组织演变

发布时间：2018-03-10 14:04

  本文选题：加工硬化率　切入点：铸态QB钢法兰坯　出处：《金属热处理》2017年02期 　论文类型：期刊论文

【摘要】：在Gleeble-3500热力模拟机上研究铸态Q235B钢法兰坯材料的高温压缩行为,采用加工硬化率方法,识别出了动态再结晶临界条件,引入无量纲参数Zener-Hollomn表征了该材料动态再结晶演变的临界应变、临界应力、峰值应变以及稳态应变模型,并对其再结晶显微组织演化进行分析。在高温、低应变速率下,该铸态材料的动态再结晶容易发生,晶粒长大更迅速;随着应变速率增大,动态再结晶难于启动,晶粒直径减小。在1050℃和1 s~(-1)下变形到达稳态时的晶粒细化效果最为显著。
[Abstract]:The high temperature compression behavior of as-cast Q235B steel flange billet was studied on Gleeble-3500 thermal simulator. The critical condition of dynamic recrystallization was identified by the method of work hardening rate. The dimensionless parameter Zener-Hollomn was introduced to characterize the critical strain, critical stress, peak strain and steady strain model of the dynamic recrystallization evolution of the material, and the evolution of recrystallization microstructure was analyzed at high temperature and low strain rate. The dynamic recrystallization of the as-cast material is easy to occur and the grain grows faster. With the increase of the strain rate, the dynamic recrystallization is difficult to start and the grain diameter decreases. The grain refinement effect is most remarkable when the deformation reaches steady state at 1050 鈩，

本文编号：1593658