Microstructure and Mechanical Properties of Medium Manganese Steel for Automobile after Different Heat Treatments
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摘要: 对汽车用中锰钢先分别进行不同温度(150,550,600,750 ℃)预热、750 ℃淬火、-75 ℃深冷处理,再进行逆相变退火处理,研究了不同工艺热处理后的显微组织与力学性能。结果表明:预热处理后中锰钢中的残余奥氏体含量均较铸态高,当预热温度为600 ℃时残余奥氏体体积分数达到最大值42.2%,此时组织为块状/板条状马氏体+残余奥氏体;随着预热温度升高,逆相变退火后中锰钢的抗拉强度增大,断后伸长率和强塑积先增大后减小,当预热温度为600 ℃时,强塑积达到最大值51.99 GPa·%;相较于淬火+逆相变退火,深冷+逆相变退火处理后中锰钢的抗拉强度和屈服强度较小,断后伸长率、强塑积和-40 ℃冲击功较高。Abstract: The medium manganese steels for automobile were treated by preheating at different temperatures (150, 550, 600, 750 ℃), quenching at 750 ℃, cryogenic treatment at -75 ℃, respectively, and then were subjected to reverted transformation annealing. The microstructure and mechanical properties after different heat treatments were studied. The results show that the retained austenite content in medium manganese steel after preheating was higher than that in as-cast steel. The volume fraction of the retained austenite reached the maximum value of 42.2% after preheating at 600 ℃, and the microstructure was composed of block/strip martensite and retained austenite. With the increase of preheating temperature, the tensile strength of medium manganese steel after reverted transformation annealing increased, and the elongation after fracture and the product of strength and elongation increased first and then decrease. When the preheating temperature was 600 ℃, the product of strength and elongation reached the maximum value of 51.99 GPa·%. Compared with those after quenching and reverted transformation annealing, the tensile strength and yield strength of the medium manganese steel after cryogenic treatment and reverted transformation annealing were smaller, and the elongation after fracture, the product of strength and elongation and the impact energy at -40 ℃ were higher.
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