Effect of Quenching Cooling Temperature on Structure and Properties of Medium Manganese Steel for Construction Machinery after Quenching and Partitioning
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摘要: 对热轧态中锰钢进行淬火-配分处理,研究了淬火冷却温度(195,220,255,280 ℃)对其显微组织、物相组成、硬度和拉伸性能的影响。结果表明:淬火-配分处理后中锰钢中存在板条马氏体、块状马氏体和残余奥氏体;随着淬火冷却温度升高,板条马氏体含量减少,块状马氏体含量增加,残余奥氏体体积分数先增大后减小,当淬火冷却温度为220 ℃时最大,为19.81%;随着淬火冷却温度的升高,中锰钢的硬度增大,抗拉强度、屈服强度和断后伸长率先增大后减小,当淬火冷却温度为220 ℃时中锰钢的断后伸长率和强塑积最大,分别为15.6%和23.76 GPa·%。Abstract: Quenching and partitioning treatment was carried out on the hot-rolled medium manganese steel, and the effects of quenching cooling temperature (195,220,255,280 ℃) on its microstructure, phase composition, hardness, and tensile properties were studied. The results show that lath martensite, massive martensite and residual austenite were found in the medium manganese steel after quenching and partitioning treatment. With increasing quenching cooling temperature, the content of lath martensite decreased, the content of massive martensite increased, and the volume fraction of residual austenite first increased and then decreased, reaching the maximum of 19.81% at quenching cooling temperature of 220 ℃. With increasing quenching cooling temperature, the hardness of the medium manganese steel increased, and the tensile strength, yield strength, and elongation after fracture first increased and then decreased. When the quenching cooling temperature was 220 ℃, the elongation after fracture and the product of strength and elongation of the medium manganese steel were the highest, which were 15.6% and 23.76 GPa·%,respectively.
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