铸态Mn18Cr18N钢多道次轧制和热处理影响研究  

Research on effects of multi-pass rolling and heat treatment of cast Mn18Cr18N steel

作　　者：刘洁 李娟[2] Liu Jie;Li Juan(School of Intelligent Engineering,Jinzhong College of Information,Taigu 030800,Shanxi,China;Taiyuan University of Sciences and Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]晋中信息学院智能工程学院,山西太谷030800 [2]太原科技大学,山西太原030024

出　　处：《钢铁钒钛》2022年第6期180-184,共5页Iron Steel Vanadium Titanium

基　　金：山西省教育科学“十四五”规划项目(GH-22010)。

摘　　要：对Mn18Cr18N电渣重熔钢进行三道次和五道次的轧制及固溶处理。借助电子背散射仪(EBSD)观察微观组织,发现随着轧制道次的增加,再结晶晶粒沿着晶界生长,呈现项链状分布,大角度晶界向小角度晶界逐渐迁移后趋于稳定,并出现大量剪切变形带,结果表明,较大的单道次压下量或较高的终轧温度有利于轧制后的Mn18Cr18N铸态奥氏体不锈钢再结晶。固溶处理后,发现晶粒细化并长大,退火孪晶增多,组织主要发生静态再结晶。对Mn18Cr18N钢进行力学性能测试,发现随着轧制道次的增加,抗拉强度由950 MPa增加至1090 MPa,屈服强度增加,断后伸长率由43.46%降至29.55%,塑性降低;相应试样固溶处理后,抗拉强度由904 MPa降至870 MPa,屈服强度降低,断后伸长率由42%升高到48%,塑性提高,结果表明固溶处理改善了材料的组织和性能。Mn18Cr18N electro-slag remelting steel was rolled in three or five passes and subject to solid solution treatment.The microstructure observation by electron back scattering diffraction(EBSD)indicates that with the increase of rolling passes,the recrystallized grains grow along the grain boundaries and distributes into a chain structure,and the high angle grain boundaries gradually migrate to the small angle grain boundaries and then stabilize.A large number of shear deformation bands appear.A larger single pass deformation or a higher final rolling temperature is beneficial to the recrystallization of Mn18Cr18N as-cast austenitic stainless steel after rolling.After solid solution treatment,the grain becomes fine due to increasing annealing twin grain and static recrystallization.With the increase of rolling passes,the tensile strength is increased from 950 MPa to 1090 MPa,and elongation after fracture decreases from 43.46%to 29.55%.After the solid solution treatment,the tensile strength decreases from 904 MPa for 3-passes to 870 MPa for 5-passes,with the strength decreasing;and the elongation after fracture increases from 42%to 48%accordingly.The results showes that the solid solution treatment can improve the microstructure and properties of the material.

关 键 词：Mn18Cr18N钢 轧制道次 固溶处理 微观组织 力学性能 

分 类 号：TG335.8[金属学及工艺—金属压力加工]