回火温度对高碳硅锰钢动态力学性能的影响  

Effect of tempering temperature on dynamic mechanical properties of a high carbon silicon manganese steel

作　　者：朱嘉豪 李晓源[1] 王迎春[2] Zhu Jiahao;Li Xiaoyuan;Wang Yingchun(Research Institute of Special Steels,Central Iron and Steel Research Institute Company Limited,Beijing 100081,China;School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司特殊钢研究院,北京100081 [2]北京理工大学材料学院,北京100081

出　　处：《金属热处理》2024年第11期84-90,共7页Heat Treatment of Metals

摘　　要：研究了一种高碳硅锰钢在820℃油淬后不同温度回火下的组织特征,并利用Hopkinson装置系统研究了其在高应变速率与不同应力状态下的力学行为。结果表明,随着回火温度的升高,碳化物数量逐渐增多,尺寸也逐渐变大。回火温度从580℃升高到620℃时,高碳硅锰钢的动态拉伸(1400 s^(-1))与压缩(3200 s^(-1))强度均呈现下降趋势,但动态拉伸塑性上升。碳化物内部的Mises应力集中与微米级碳化物/基体界面处的剪应力集中是高碳硅锰钢动态拉伸时微孔形核的关键因素。在动态压缩过程中,高碳硅锰钢的塑性变形受应变硬化与热软化机制的耦合影响,并表现出明显的应变速率敏感性。Microstructure of a high carbon silicon manganese steel quenched at 820℃with oil cooling and then tempered at different temperatures was investigated,and the mechanical behaviour under high strain rates and various stress states was systematically examined by using the Hopkinson device.The results reveal that the quantity and size of carbides increase with the increase of tempering temperature.Specifically,as the tempering temperature rises from 580℃to 620℃,the dynamic tensile(strain rate of 1400 s^(-1))and compressive(strain rate of 3200 s^(-1))strengths of the tested steel exhibit a decreasing trend,while an enhancement in dynamic tensile plasticity is observed.The Mises stress concentration in carbide and the shearing stress concentration at the micron carbide/matrix interface are crucial factors for microvoid nucleation during dynamic tensile tests of the tested steels.During dynamic compression,the plastic deformation of the steel is influenced by a coupling mechanism involving strain hardening and heat softening,thereby exhibiting significant strain rate sensitivity.

关 键 词：高碳硅锰钢 热处理 组织 动态力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]