Effect of cooling methods after ART annealing on work hardening behavior of 0.1C-7.2Mn steel

doi:10.13251/j.issn.0254-6051.2022.07.010

Abstract

Abstract: Taking 0.1C-7.2Mn hot rolled and cold rolled medium manganese steel as the research object, the effect of different cooling methods after ART annealing on work hardening behavior of the medium manganese steel were studied by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and room temperature tensile test. The results show that lath ferrite austenite structure is obtained in the hot rolled steel after ART annealing, and a large number of carbides precipitate in the air-cooled specimens, while water cooling inhibits carbides precipitation. The equiaxed ferrite and austenite micro structure is obtained in the cold rolled steel after ART annealing, and the air-cooled specimens shows continuous yield, and water cooling promots the equiaxed microstructure. Higher volume fraction of retained austenite is obtained in the hot rolled specimens, which show a excellent mechanical properties. The larger the volume fraction of retained austenite, the longer the TRIP effect during tensile deformation, providing higher and more sustained work hardening.

Key words: medium manganese steel, cooling methods, work hardening, retained austenite, TRIP effect

CLC Number:

TG142

Wang Sichao, Xu Haiwei, Xu Yong, Han Yun, Zheng Xiaoping, Li Hongbin, Tian Yaqiang, Chen Liansheng. Effect of cooling methods after ART annealing on work hardening behavior of 0.1C-7.2Mn steel[J]. Heat Treatment of Metals, 2022, 47(7): 58-62.

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