48MnV非调质钢热成形流动应力模型  

A flow stress model of 48MnV microalloyed steel during hot deformation

作　　者：鞠晓辉 申昱[1] 胡俊[1] 张杰[1] 于沪平[1] JU Xiao-hui;SHEN Yu;HU Jun;ZHANG Jie;YU Hu-ping(Institute of Plastic Forming Technology and Equipment,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]上海交通大学塑性成形技术与装备研究院

出　　处：《塑性工程学报》2019年第4期187-193,共7页Journal of Plasticity Engineering

基　　金：包头-上海交通大学创新引导基金

摘　　要：通过对48MnV非调质钢试样进行高温压缩试验,得到不同温度和应变速率下的流动应力曲线,分析了应力随应变的变化以及温度和应变速率对应力的影响规律,基于Zener-Hollomon参数建立了高温流动应力模型和动态再结晶体积分数模型。采用未参与模型建立的实验数据对所建立的流动应力模型和动态再结晶体积分数模型进行了验证。结果表明,所建模型与实验数据的符合程度较高,具有较好的可靠性。同时对微观组织进行了观察,随着应变速率的增加,同一温度下晶粒的尺寸逐渐变小。The flow stress curves of 48MnV microalloyed steel under different temperatures and strain rates were obtained by high temper-ature compression tests.The variation of stress with strain and the influences of temperature and strain rate on stress were analyzed.The high temperature flow stress model and dynamic recrystallization volume fraction model were established based on Zener-Hollomon parame-ters.The flow stress model and dynamic recrystallization volume fraction model were validated by the experimental data which were not in-volved in the model establishment.The results show that the models are in good agreement with the experimental data and have good relia-bility.And the microstructures of the deformed specimens were observed,with the increase of strain rate,the grain size decreases gradual-ly at the same temperature.

关 键 词：48MnV非调质钢 高温流动应力模型 动态再结晶体积分数模型 流动应力 

分 类 号：TG142.12[一般工业技术—材料科学与工程]