退火温度对Fe-0.4C-2Mn-4Al高强钢组织与拉伸性能的影响  

Effect of Annealing Temperature on Microstructure and Tensile Properties of Fe-0.4C-2Mn-4Al High Strength Steel

作　　者：马晓杰 樊伟 冯运莉 李杰 MA Xiaojie;FAN Wei;FENG Yunli;LI Jie(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,唐山063210

出　　处：《机械工程材料》2024年第12期19-24,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51974134);河北省科技重大专项项目(21281008Z)。

摘　　要：通过真空感应炉熔炼、热轧、冷轧和退火工艺制备Fe-0.4C-2Mn-4Al高强钢,研究了退火温度(650,700,750,800℃)对其显微组织和拉伸性能的影响。结果表明:不同温度退火后试验钢的组织与热轧和冷轧态试验钢基本相同,均由δ-铁素体、α-铁素体、渗碳体以及细小的κ型碳化物组成;随着退火温度的升高,δ-铁素体条带逐渐消失,再结晶程度增加,α-铁素体晶粒尺寸增大,碳化物数量减少;750℃退火后α-铁素体与渗碳体的分布最为均匀。不同温度退火态试验钢的拉伸曲线均未见明显的屈服平台,说明试验钢发生连续均匀的塑性变形;随着退火温度的升高,试验钢的抗拉强度、屈服强度整体呈降低趋势,断后伸长率呈增大趋势。当退火温度为750℃时,试验钢的强塑积最大,为14.28 GPa·%,加工硬化能力最好,综合性能最好。Fe-0.4C-2Mn-4Al high strength steel was prepared by vacuum induction furnace melting,hot rolling,cold rolling and annealing processes.The influence of annealing temperature(650,700,750,800°C)on its microstructure and tensile properties was studied.The results show that the microstructure type of test steel after annealing at different temperatures was basically the same as those of the hot-rolled and cold-rolled test steel,all consisting ofδ-ferrite,α-ferrite,cementite and fineκ-type carbides.As the annealing temperature increased,theδ-ferrite strips gradually disappeared and its degree of recrystallization increased,the grain size ofα-ferrite increased,and the amount of carbides decreased.The distribution ofα-ferrite and cementite was the most uniform after annealing at 750℃.The tensile curves of the test steel after annealing at different temperatures showed no obvious yield plateau,indicating that the test steel underwent continuous and uniform plastic deformation.With the increase of annealing temperature,the tensile strength and yield strength of the test steel showed an overall decreasing trend,and the percentage elongation after fracture increased.When the annealing temperature was 750°C,the product of strength and ductility of the test steel was the largest,which was 14.28 GPa·%,and the work hardening ability was the best;the test steel had the best comprehensive performance.

关 键 词：Fe-C-Mn-Al高强钢 退火 显微组织 拉伸性能 加工硬化率 

分 类 号：TG142[一般工业技术—材料科学与工程]