压下量对冷轧+退火态3Cr13不锈钢车板组织和力学性能的影响  

Influences of reduction amount on microstructure and mechanical properties of cold rolled+annealed 3Cr13 stainless steel plate for automobile

作　　者：王东霞[1] 张娜[2] 刘玲玲[1] 翟会丽 吴珍珍 Wang Dongxia;Zhang Na;Liu Lingling;Zhai Huili;Wu Zhenzhen(School of Mechanical and Electrical Engineering,Zhengzhou University of Finance and Economics,Zhengzhou 460000,China;National Engineering Research Center for Rubber and Plastic Molds,Zhengzhou University,Zhengzhou 460000,China)

机构地区：[1]郑州财经学院机电与汽车工程学院,河南郑州460000 [2]郑州大学橡塑模具国家工程研究中心,河南郑州460000

出　　处：《锻压技术》2021年第8期211-216,共6页Forging & Stamping Technology

基　　金：江苏省重点研发计划(BE2019096);河南省高等学校重点科研项目(21A460023);企业重点招标项目(TC160A130)。

摘　　要：选择厚度为4.2 mm的3Cr13不锈钢热轧板作为基材,对固溶处理试样依次进行了冷轧,冷轧压下量分别为60%与80%,使其厚度减小为1.61与1.22 mm,并升温至900~1050℃完成退火。测试了其显微组织结构与力学特性。研究结果表明:在固溶试样中形成了大量再结晶晶粒,大部分呈现等轴状形态,经冷轧后,等轴状形态的铁素体晶粒沿轧向伸长。逐渐增大冷轧压下量后,生成了更多细长晶粒。在冷轧组织内析出了少量黑色与浅白色组织,黑色颗粒成分为TiN,浅白色颗粒主要由Nb(C,N)构成。试样经过冷轧处理后获得了更大的拉伸强度与屈服强度,压下量为80%的试样拉伸强度为981 MPa、屈服强度为929 MPa、伸长率未超过1.2%、硬度为362.8 HV。逐渐增加退火时间后,冷轧试样中形成了更高比例的σ相,以900℃对80%冷轧试样进行退火时达到了最大增幅。以900℃退火更易促进σ相的形核与长大过程。Selecting the 3 Cr13 stainless steel hot rolled plate with the thickness of 4.2 mm as the base material,the specimens after solution treatment were successively cold rolled with the reduction amounts of 60%and 70%to reduce their thicknesses to 1.61 and 1.22 mm and annealed at the temperature range of 900-1050℃,and its microstructure and mechanical properties were tested.The results show that many recrystallized grains are formed in the solution samples,most of which are in the form of equiaxed shape,and the ferrite grains in equiaxed-shaped state are elongated along the rolling direction after cold rolling.After gradually increasing the cold rolled reduction amount,more elongated grains are generated,and a small amount of black and light white structures are precipitated in the cold rolled structure.Among them,the black particles are composed of TiN,and the light white particles are mainly composed of Nb(C,N).Furthermore,the specimens obtain greater tensile strength and yield strength by cold rolling treatment,and the tensile strength,yield strength and hardness of specimen with the reduction amount of 70%is 981 MPa,929 MPa and 362.8 HV respectively as well as the elongation does not exceed 1.2%.After gradually increasing the annealing time,a higher proportion ofσphase is formed in the cold-rolled specimens,and the maximum increase is achieved when the 80%cold-rolled specimens are annealed at 900℃.Thus,the nucleation and growth ofσphase are promoted by the annealing at 900℃.

关 键 词：压下量 冷轧 3Cr13不锈钢板 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]