Fe-0.13C-2.0Mn-0.6Al复相钢在不同退火温度下的组织与性能  

Microstructure and properties of Fe⁃0.13C⁃2.0Mn⁃0.6Al multiphase steels annealed at different temperatures

作　　者：张淼 万德成 张波 冯运莉 Zhang Miao;Wan Decheng;Zhang Bo;Feng Yunli(Metallurgical Energy Source Academy,North China University of Science and Technology,Tangshan Hebei 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：《金属热处理》2024年第6期43-49,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(51974134);河北省科技重大专项(21281008Z);唐山市应用基础研究(21130218C)。

摘　　要：利用扫描电镜、电子背散射衍射仪和拉伸试验机等方法研究了退火温度对冷轧态Fe-0.13C-2.0Mn-0.6Al高强复相钢的组织与力学性能的影响。结果表明,复相钢冷轧板组织为铁素体、马氏体、贝氏体和部分碳化物,退火板室温组织主要是等轴铁素体、粒状贝氏体及块状马氏体。随着退火温度的升高,组织中马氏体与贝氏体含量先增大后减小,大角度晶界占比逐渐增大,铁素体晶粒再结晶程度增加,退火板平均晶粒尺寸先增大后减小再增大,屈服强度先增高再降低,抗拉强度逐渐降低。当退火温度为750℃时,退火板平均晶粒尺寸为2.11μm,马氏体与贝氏体占比为40.4%,强塑积达到19.80 GPa·%,综合力学性能最佳。Effect of annealing temperature on the microstructure and mechanical properties of cold⁃rolled Fe⁃0.13C⁃2.0Mn⁃0.6Al high strength multiphase steel were studied by means of scanning electron microscope,electron backscattering diffraction and tensile testing machine.The results show that the microstructure of the cold⁃rolled sheet of the multiphase steel is composed of ferrite,martensite,bainite and some carbides.The microstructure of the annealed sheet at room temperature is mainly equiaxed ferrite,granular bainite and block martensite.With the increase of annealing temperature,the content of martensite and bainite in the microstructure increases first and then decreases,the proportion of large angle grain boundary increases gradually,and the degree of recrystallization of ferrite grains increases.At the same time,the average grain size of the annealed sheet increases first,then decreases and then increases,the yield strength increases first and then decreases,and the tensile strength decreases gradually.When the annealing temperature is 750℃,the average grain size of the annealed sheet is 2.11μm,the proportion of martensite and bainite is 40.4%,the product of strength and plasticity reaches 19.80 GPa·%,and the comprehensive mechanical properties are the best.

关 键 词：复相钢 退火温度 显微组织 力学性能 

分 类 号：TG142[一般工业技术—材料科学与工程]