淬火加热温度对超细晶Q&P钢组织性能的影响  

Effect of quenching temperature on microstructure and properties of ultrafine-grained Q&P steel

作　　者：郭昊东 唐正友 赵利 管国富 游泽宇 丁桦 Guo Haodong;Tang Zhengyou;Zhao Li;Guan Guofu;You Zeyu;Ding Hua(School of Materials Science and Engineering,Northeastern University,Shenyang Liaoning 110819,China;Liaoning Provincial Key Laboratory of Lightweight Metallic Structural Materials,Shenyang Liaoning 110819,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]辽宁省轻量化用关键金属结构材料重点实验室,辽宁沈阳110819

出　　处：《金属热处理》2022年第12期67-73,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(51874088);中央高校基本科研业务专项(N2002015)。

摘　　要：研究了淬火加热温度对超细晶Q&P钢微观组织、元素分布、残留奥氏体体积分数和力学性能的影响。结果表明,当淬火加热温度升高时,铁素体含量逐渐减少,马氏体含量升高,残留奥氏体含量呈现先增加后减少的趋势,高淬火加热温度下C元素的扩散速率加快,残留奥氏体的机械稳定性更好。软相铁素体的存在为试验钢提供了良好的韧性。当淬火加热温度为820℃时,Q&P钢的综合力学性能最好,抗拉强度为863 MPa,伸长率为26.1%,强塑积为22.5 GPa·%。Effect of quenching temperature on microstructure,element distribution,retained austenite volume fraction and mechanical properties of ultrafine-grained Q&P steels was investigated.The results show that when the annealing temperature increases,the ferrite content gradually decreases,the martensite content increases,and the retained austenite content increases first and then decreases;and at high quenching temperatures,the diffusion rate of C atoms is accelerated,the mechanical stability of retained austenite is better.The presence of soft-phase ferrite provides good toughness for the tested steel.When the quenching temperature is 820℃,the comprehensive mechanical properties of the Q&P steel are the best,the tensile strength is 863 MPa,the elongation is 26.1%,and the strength-plasticity product is 22.5 GPa·%.

关 键 词：Q& P钢 微观结构 力学性能 残留奥氏体 TRIP效应 

分 类 号：TG161[金属学及工艺—热处理]