锻压技术

晶粒细化对Fe-Mn-C系孪晶诱发塑性钢动态应变时效行为的影响

英文标题：Effect of grain refinement on dynamic strain aging behavior for Fe-Mn-C twinning-induced plasticity steel

关键词：高锰钢孪晶诱发塑性钢晶粒尺寸锯齿流变 Portevin-Le Chátelier效应

分类号：TG142.1

出版年,卷(期):页码：2024,49(11):210-216

摘要：

利用室温单向拉伸实验，结合数字图像相关（DIC）、金相组织观察、X射线衍射（XRD）等检测手段，研究了晶粒细化对Fe-16Mn-0.6C钢的拉伸性能、锯齿流变、Portevin-Le Chátelier（PLC）变形带演化的影响。结果表明：随着晶粒尺寸的减小，实验钢的屈服强度、抗拉强度升高，加工硬化数值升高；晶粒细化使动态应变时效（DSA）锯齿幅度显著增大，细晶粒钢产生更加强烈的动态应变时效行为；采用DIC观察发现，与粗晶粒钢相比，细晶粒钢中PLC变形带的应变集中程度更高，但相同应变下细晶粒钢中PLC变形带的运动速率低于粗晶粒钢。利用XRD分析发现，晶粒细化促进位错增殖，获得高密度位错组织，可能是其具有更强烈的动态应变时效现象及加工硬化能力的主要原因。

The influences of grain refinement on the tensile properties, serrated rheology and PLC band evolution of Fe-16Mn-0.6C steel were investigated by uniaxial tensile experiments at room temperature, combining with digital image correlation (DIC), metallographic observation, X-ray diffraction (XRD) and other detection methods. The results indicate that with the decreasing of grain size, the yield strength and tensile strength of Fe-16Mn-0.6C steel are increased, and the work hardening value is increased. Grain refinement significantly increases the serration amplitude of dynamic strain aging (DSA), resulting in stronger dynamic strain aging behavior in fine-grained steel. Using DIC, it′s observed that the strain concentration of PLC bands in fine-grained steel is higher, but the moving rate of PLC bands is lower than that in coarse-grained steel at the same strain. Through XRD analysis, it′s found that the grain refinement promotes dislocation proliferation and the high-density dislocation structure is obtained, which may be the main reason for its stronger phenomenon of dynamic strain aging and work hardening ability.

基金项目：

河北省自然科学基金资助项目（E2021209080）；河北省中央引导地方科技发展资金资助项目（236Z1014G）；唐山市科技局资助项目（23130206E）；华北理工大学重点科研项目（ZD-ST-202310-23）

作者简介：王伟（1973-），男，学士，高级讲师 E-mail：476106582@qq.com 通信作者：刘帅（1988-），男，博士，副教授 E-mail：sliu_ysu@163.com

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