Grain Size-Dependent Mechanical Properties of a High-Manganese Austenitic Steel

作     者：Xiao-Jiang Wang Xin-Jun Sun Cheng Song Huan Chen Shuai Tong Wei Han Feng Pan 

作者机构：School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Structural SteelsCentral Iron and Steel Research InstituteBeijing 100081China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2019年第32卷第6期

页      面：746-754页

核心收录：

学科分类：0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程] 

基　　金：supported financially by the National Key Research and Development Program of China (No.2017YFB0305100) 

主　　题：High-Mn steel Grain size Low-temperature toughness Hall–Petch Micro-twin 

摘      要：The effect of grain size on the mechanical properties of a high-manganese(Mn)austenitic steel was investigated via electron-backscattered diffraction,transmission electron microscope,X-ray diffraction,and tensile and impact tests at 25°C and-196°*** Hall–Petch strengthening coefficients for the yield strength of the high-Mn austenitic steels were 7.08 MPa mm 0.5 at 25°C,which increased to 14 MPa mm 0.5 at-196°*** effect that the grain boundary strengthening had on improving the yield strength at-196°C was better than that at 25°*** impact absorbed energies and the tensile elongations were enhanced with the increased grain size at 25°C,while they remained nearly unchanged at-196°*** unchanged impact absorbed energies and the tensile elongations were primarily attributed to the emergence of the micro-twin at-196°C,which promoted the cleavage fracture in the steels with large-sized *** the grain size could improve the strength of the high-Mn austenitic steels without impairing their ductility and toughness at low temperature.