碳钢/不锈钢复合板微观组织演变及残余应力分析  

Microstructure evolution and residual stress analysis on carbon steel/stainless steel composite plate

作　　者：徐惠婷 李海斌[1] 吕海波 帅美荣[1] 王强[1] Xu Huiting;Li Haibin;Lyu Haibo;Shuai Meirong;Wang Qiang(Heavy Machinery Engineering Research Center of Education Ministry,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学重型机械教育部工程研究中心,山西太原030024

出　　处：《锻压技术》2025年第4期117-124,共8页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(51875382);山西省重点研发计划项目(202302150401003);太原市关键核心技术攻关“揭榜挂帅”项目(2024TYJB0114);太原科技大学研究生创新项目(SY2023022);晋城市重点研发计划(20230109);忻州市重点研发计划(20240103)。

摘　　要：采用真空热轧工艺制备Q235碳钢/304不锈钢复合板,第1道次压下率为30%,第2道次压下率分别为0%、10%、20%和25%。计算了基板/复板组织的平均晶粒度、位错密度及残余应力,并讨论了三者之间的关系。结果表明:随着压下率增加,界面铁素体区的面积逐渐减小,而界面处基板/复板的几何必要位错密度呈增大趋势。第2道次压下率从0%增加至20%时,基板碳钢平均晶粒度GC增大,塑性变形导致碳钢位错密度由0.49×10^(14)m^(-2)增加至0.80×10^(14)m^(-2),残余应力由48.77 MPa增加至243.83 MPa;当压下率增大至25%时,GC减小,位错密度降低至0.67×10^(14)m^(-2),残余应力减小至33.89 MPa。而随着压下率增加,复板不锈钢平均晶粒度GS不断增大,位错密度由0.58×10^(14)m^(-2)增加至1.02×10^(14)m^(-2),残余应力由45.93 MPa增加至91.86 MPa。研究结果为该类型复合板轧制工艺和组织调控技术提供了理论参考。Q235 carbon steel/304 stainless steel composite plate was prepared by vacuum hot-rolled process with the first pass reduction rate of 30%and the second pass reduction rate of 0%,10%,20%and 25%,respectively.Then,the average grain size,dislocation density and residual stress of microstructures for substrate and composite plates were calculated,and the relationship among them was discussed.The results show that with the increasing of reduction rate,the area of interfacial ferrite region decreases gradually,and the geometric necessary dislocation density of substrate and composite plates at the interface shows an increasing trend.When the reduction rate of second pass increases from 0%to 20%,the average grain size of substrate carbon steel(GC)increases,and the dislocation density caused by plastic deformation of carbon steel increases from 0.49×10^(14)to 0.8×10^(14)m^(-2).The residual stress increases from 48.77 to 243.83 MPa.When the reduction rate increases to 25%,the GC size decreases,the dislocation density decreases to 0.67×10^(14)m^(-2),and the residual stress is reduced to 33.89 MPa.As the reduction rate increases,the average grain size of composite plate stainless steel(GS)increases continuously,the dislocation density increases from 0.58×10^(14)to 1.02×10^(14)m^(-2),and the residual stress increases from 45.93 to 91.86 MPa.The study results provide a theoretical reference for the rolling process and microstucture control technology of this type of composite plate.

关 键 词：热轧复合板 微观组织 位错密度 残余应力 晶粒度 

分 类 号：TG335.81[金属学及工艺—金属压力加工]