退火温度对25Mn-3Si-3Al-TWIP钢组织和力学性能的影响  

Effects of annealing temperature on microstructures and properties of the 25Mn-3Si-3Al-TWIP steel

作　　者：米振莉[1] 唐荻[1] 代永娟[1] 王海全[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《北京科技大学学报》2007年第S2期117-121,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金项目(No50575022)

摘　　要：研究了不同退火温度对25Mn-3Si-3Al-TWIP钢组织和力学性能的影响.结果表明经1000℃退火后,此钢种可达到640MPa左右的抗拉强度和255MPa左右的屈服强度以及82%以上的延伸率,具有较好的综合力学性能.其室温组织为单相奥氏体基体的退火孪晶,通过TEM观察内部为大量的层错和孪晶共存结构.在随后的拉伸变形过程中产生大量形变孪晶,发生了TWIP效应——孪晶诱发塑性效应,使钢板具有优良的力学性能.The influence of annealing temperature on microstructures and mechanical properties of the 25Mn-3Si-3Al-TWIP steel was studied in this paper.The results showed that the steel had better comprehensive mechanical properties when the annealing temperature was 1 000 ℃.The tensile strength of the steel is about 640 MPa and the yield strength is higher than 255 MPa,while the elongation is above 82%.The microstructure is composed austenitic matrix and annealed twins at room temperature,at the same time,a significant amount of annealed twins and stacking faults are observed by TEM.Mechanical twins play a dominant role during deformation and result in excellent mechanical properties.

关 键 词：退火温度 TWIP钢 退火孪晶 形变孪晶 

分 类 号：TG161[金属学及工艺—热处理]