热处理工艺对Q&P钢组织与性能的影响  

Effect of quenching and partitioning process on microstructure and mechanical properties of Q&P steel

作　　者：朱帅[1] 邝霜[2] 姜英花[2] 康永林[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]首钢技术研究院,北京100043

出　　处：《金属热处理》2013年第10期1-4,共4页Heat Treatment of Metals

基　　金：国家科技支撑计划(2012BAF04B01)

摘　　要：淬火配分(Quenching and partitioning,Q&P)热处理工艺处理的钢种具有优异的强度和塑性配合。该热处理工艺涉及奥氏体化、淬火时马氏体形成、配分阶段的碳扩散和贝氏体相变。本文通过对实验室设计新型成分钢种进行Q&P热处理试验,分析了淬火配分过程的组织演变和力学性能变化规律。结果表明:两相区奥氏体化处理可以得到一定的铁素体组织,有利于钢的塑性提高,在完全奥氏体化后采用250℃的淬火配分温度进行一步Q&P热处理,其抗拉强度和伸长率分别达到1655 MPa和16.7%,采用250℃等温淬火和400℃×2 min的配分条件进行两步Q&P热处理得到的抗拉强度和伸长率分别为1118 MPa和19.1%,强度的变化主要受到马氏体基体脱碳软化和贝氏体组织形成的影响,伸长率随着组织中残留奥氏体的体积分数增加而提高。Q＆P （ quenching and partitioning ） process is a novel heat treatment technology which could product high combination of strength and ductility.Austenization, martensite formation during quenching process , carbon partitioning and bainite formation during partitioning stage appeared in Q＆P process .Microstructure evolution and affection on mechanical property were analyzed by different heat treatment parameters during Q＆P process on a new component steel designed in lab .The results show that a better elongation is obtained at lower austenization temperature due to more ferrite appeared , after full austenization and partitioned at 250 ℃ （ one-step Q＆P ） , the tensile strength and elongation are 1655 MPa and 16 .7%, respectively , as for samples austempered at 250 ℃and partitioned at 400 ℃for 2 min （two-step Q＆P） are 1118 MPa and 19.1%.The strength is influenced by martensite matrix decarbonization soften and bainite formation , while elongation is improved with the increasing of retained austenite volume fraction .

关 键 词：淬火配分 组织演变 奥氏体化 残留奥氏体 

分 类 号：TF762.2[冶金工程—钢铁冶金]