退火对大变形异步-同步复合轧制超细晶TWIP钢组织与性能的影响  

Effect of Annealing on Microstructure and Mechanical Properties of Ultrafine-grained TWIP Steel Produced by Severely Asymmetric and Symmetric Rolling

作　　者：姚学峰[1] 付斌[1,2] 付立铭 张道达[3] 尧登灿 单爱党 YAO Xuefeng;FU Bin;FU Liming;ZHANG Daoda;YAO Dengcan;SHAN Aidang(Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China;Jiangxi Mechanical Science Institute, Nanchang 330002, China)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]上海应用技术大学材料科学与工程学院,上海201418 [3]江西省机械科学研究所,南昌330002

出　　处：《材料研究学报》2017年第11期809-817,共9页Chinese Journal of Materials Research

基　　金：中国博士后科学基金(2015M581608);江西省科技厅项目(20151BDH80082);国家重点研发专项(2014ZX07214-002)~~

摘　　要：研究了不同退火温度对大变形异步与同步复合冷轧制TWIP钢(Fe-0.5C-18.6Mn-1.5Al-0.5Si)的组织和性能的影响,结果表明:经96%大变形轧制后的材料组织明显细化,抗拉强度从593 MPa提升至2021 MPa;在500℃以下退火,大变形轧制超细晶TWIP钢未发生再结晶;在500~600℃发生部分再结晶;在600℃以上则发生完全再结晶。随着退火温度升高,材料强度降低,但塑性增加,大变形异步-同步轧制后经700℃退火获得了平均晶粒尺寸600 nm的超细晶TWIP钢,并表现出优秀的综合力学性能,其强度、塑性分别达到1114 MPa、59.4%。此外,制备的TWIP钢在500℃~600℃退火时,奥氏体基体中生成了大量细小弥散的硬质DO3结构的(Fe,Mn)3(Al,Si)型金属间化合物,显著提高了材料强度。The effect of annealing temperature on microstructure and mechanical properties of TWIP steel（Fe-0.5 C-18.6 Mn-1.5 Al-0.5 Si） is investigated, while the steel was produced aforehand by severe symmetric and asymmetric rolling at room temperature. The results show that the grain size is significantly refined after severe asymmetric and symmetric rolling, and the ultimate tensile strength（UTS） increased from 593 MPa to 2021 MPa. The severely rolled TWIP steel shows no recrystallization when annealed below 500℃, partial recrystallization when annealed between 500-600℃, and full recrystallization when annealed above 700℃. With the increasing annealing temperature, the strength decreases while the elongation increases. Specifically, the UFG（Ultrafine-grained） TWIP steel with an average grain size of 500 nm and excellent mechanical properties can be obtained when annealed at 700℃, i.e. the UTS,elongation and product of strength and elongation of the steel are 1114 MPa,59.4 % and 66.2 GPa·%, respectively. Moreover, when annealed between 500-600℃, there existed many dispersive fine-grained intermetallic compounds with DO3-type crystallographic structure in the produced steel, which can significantly enhance the strength of the steel

关 键 词：金属材料 超细晶TWIP钢 大变形异步轧制 退火 力学性能 

分 类 号：TG142[一般工业技术—材料科学与工程]