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基于热镀锌的工艺特点制定Q/P热处理工艺,研究了奥氏体化温度及配分时间对组织和性能的影响。结果表明,随奥氏体化温度从800升至900℃,Q/P处理后组织中铁素体量减少,马氏体和残余奥氏体量增加,钢的屈服强度、抗拉强度均升高,伸长率降低,900℃奥氏体化时钢的强塑积最高。在460℃配分10、30、60s时,随着配分时间延长,组织中马氏体发生回火且发生大量贝氏体转变,造成Q/P处理后残余奥氏体量减少,使钢的抗拉强度、伸长率和强塑积均下降。
Based on the technical characteristics of hot-dip galvanizing, the Q / P heat treatment process was established. The effects of austenitizing temperature and time on the microstructure and properties were studied. The results showed that with the increase of the austenitizing temperature from 800 ℃ to 900 ℃, the amount of ferrite decreased, the amount of martensite and retained austenite increased, and the yield strength and tensile strength of the steel increased , Lower elongation, 900 ℃ austenitizing steel when the highest plasticity. At 460 ℃ with 10,30,60 s, with the extension of time, the organization of martensite tempering and the occurrence of a large number of bainite transformation, resulting in reduced amount of retained austenite after Q / P treatment, the steel resistance Tensile strength, elongation and strong plastic product decreased.