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Grain Size-Dependent Mechanical Properties of a High-Manganese Austenitic Steel 被引量:1
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作者 Xiao-Jiang Wang Xin-Jun Sun +4 位作者 Cheng Song Huan Chen Shuai Tong Wei Han Feng Pan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2019年第6期746-754,共9页
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 ... 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°C.The 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°C.The effect that the grain boundary strengthening had on improving the yield strength at-196°C was better than that at 25°C.The impact absorbed energies and the tensile elongations were enhanced with the increased grain size at 25°C,while they remained nearly unchanged at-196°C.The 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 grains.Refining the grain size could improve the strength of the high-Mn austenitic steels without impairing their ductility and toughness at low temperature. 展开更多
关键词 High-Mn steel Grain size LOW-TEMPERATURE TOUGHNESS Hall–Petch micro-twin
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