冷轧和退火处理对Fe-12Mn-7Al-0.2C-0.6Si钢组织及拉伸变形行为的影响  

Effects of Cold Rolling and Annealing on Microstructure and Tensile Deformation Behavior of Fe-12Mn-7Al-0.2C-0.6Si Steel

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作  者:刘焕优 耿一帆 刘帅 陈林 冯运莉 LIU Huanyou;GENG Yifan;LIU Shuai;CHEN Lin;FENG Yunli(College of Metallurgy and Energy,North China University of Science and technology,Tangshan 063210,China)

机构地区:[1]华北理工大学冶金与能源学院,河北唐山063210

出  处:《热加工工艺》2025年第4期53-58,共6页Hot Working Technology

基  金:国家自然科学基金项目(51801063,51974134);河北省高等学校科学技术研究项目(BJ2019018)。

摘  要:对冷轧Fe-12Mn-7Al-0.2C-0.6Si钢进行退火处理,测试不同退火温度对试验钢拉伸性能的影响,并利用OM、XRD、EBSD等技术手段对试验钢的微观组织及拉伸变形行为进行研究。结果表明:试验钢经冷轧退火处理后,组织中含有奥氏体和铁素体两相,随退火温度升高,奥氏体相含量增加;随退火温度升高试验钢屈服和抗拉强度降低,塑性升高;拉伸变形初期应变主要集中在奥氏体相,随拉伸进一步进行应变向铁素相转移;综合考虑两相比例分数以及Al、Mn元素的偏聚现象,计算得到试验钢800℃退火后奥氏体相的层错能为40.4 mJ/m^(2)。结合EBSD观察结果,奥氏体相的变形机制为位错滑移。The cold-rolled Fe-12Mn-7Al-0.2C-0.6Si steel was annealed,and the effect of annealing temperatures on the tensile properties of the steel was studied.The microstructure and tensile deformation behavior of the steel were investigated by OM,XRD and EBSD techniques.The results show that there are two phases of austenite and ferrite in the microstructure of the steel after cold-rolled and annealing.The content of austenite phase increases with increasing annealing temperature.The yield and tensile strength decrease,and the plasticity increases with increasing annealing temperature.At the beginning of the tensile deformation,the strain is mainly concentrated in austenite phase,and the strain transfers to ferric phase at high strain range.Considering the proportion of the two phases and the segregation of Al and Mn,the stacking fault energy of austenite phase after annealing at 800℃is calculated to be 40.4 mJ/m^(2).Therefore,the dislocation slip is the deformation mechanism of austenite phase.

关 键 词:Fe-Mn-Al-C钢 双相钢 微观组织 应变分布 层错能 

分 类 号:TG156.2[金属学及工艺—热处理] TG335.12[金属学及工艺—金属学]

 

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