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

作　　者：Zhen-li Mi Di Tang Hai-tao Jiang Yong-juan Dai Shen-sheng Li 

机构地区：[1]National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2009年第2期154-158,共5页矿物冶金与材料学报（英文版）

基　　金：the National Natural Science Foundation of China (No.50575022);the Specialized Research Foundation for the Doctoral Program of Higher Education of China (No.20040008024);the National High-Tech Research and Development Program of China (No.2008AA03E502)

摘　　要：Microstructures and mechanical properties of the 25Mn twinning induced plasticity （TWIP） steel at different annealing temperatures were investigated. The results indicated that when the annealing temperature was 1000℃, the 25Mn steel showed excellent comprehensive mechanical properties, the tensile strength was about 640 MPa, the yield strength was higher than 255 MPa, and the elongation was above 82%. The microstructure was analyzed by optical microscopy （OM）, X-ray diffraction （XRD）, and transmission electron microscopy （TEM）. Before deformation the microstructure was composed of austenitic matrix and annealing twins at room temperature; at the same time, a significant amount of annealing twins and stacking faults were observed by TEM. Mechanical twins played a dominant role in deformation and as a result the mechanical properties were found to be excellent.Microstructures and mechanical properties of the 25Mn twinning induced plasticity （TWIP） steel at different annealing temperatures were investigated. The results indicated that when the annealing temperature was 1000℃, the 25Mn steel showed excellent comprehensive mechanical properties, the tensile strength was about 640 MPa, the yield strength was higher than 255 MPa, and the elongation was above 82%. The microstructure was analyzed by optical microscopy （OM）, X-ray diffraction （XRD）, and transmission electron microscopy （TEM）. Before deformation the microstructure was composed of austenitic matrix and annealing twins at room temperature; at the same time, a significant amount of annealing twins and stacking faults were observed by TEM. Mechanical twins played a dominant role in deformation and as a result the mechanical properties were found to be excellent.

关 键 词：annealing temperature TWIP steel annealing twins mechanical twins 

分 类 号：TG161.8[金属学及工艺—热处理] TB383[金属学及工艺—金属学]