退火温度对汽车用高铝TRIP钢组织性能的影响  

Influence of annealing temperature on microstructure and properties of high aluminum TRIP steel for antomobile

作　　者：李辉[1,2] 史春丽 尹红霞[1] 祝贞凤 Li Hui;Shi Chunli;Yin Hongxia;Zhu Zhenfengl(College of Engineering,Yantai Nanshan University,Yantai Shandong 265713,China;National Engineering Research Center for Plastic Working of Aluminum Alloys,Shandong Nanshan Aluminum Co.,Ltd.,Yantai Shandong 265700,China)

机构地区：[1]烟台南山学院工学院,山东烟台265713 [2]山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心,山东烟台265700

出　　处：《金属热处理》2018年第9期102-105,共4页Heat Treatment of Metals

基　　金：山东省自然科学基金(ZR2016EMP05);山东省高等学校优势学科人才团队培育计划

摘　　要：设计了一种高铝TRIP钢,研究了不同临界退火处理对力学性能及微观组织的影响。利用扫描电镜（SEM）、背散射电子衍射（EBSD）和X射线衍射（XRD）进行了微观组织精细观察,拉伸试验机测试了力学性能。试验结果表明：试验钢热力学平衡状态下,铁素体＋奥氏体两相区温度区间为716~953℃;两相区内随退火温度的升高,抗拉强度呈现逐步增高的趋势,伸长率首先降低而后逐步增高,在820℃为最低值21.5%;经800℃和820℃的退火处理后,微观组织中铁素体量较多,而经840℃和860℃退火处理后,铁素体量降低,晶粒变得细小、弥散,贝氏体与残留奥氏体的含量逐渐增多。Influence of annealing temperature on microstructure and mechanical properties of a high aluminum TRIP steel was studied. The microstructure was investigated by means of SEM,EBSD,and XRD technique,and the mechanical properties was tested. The results indicate that the temperature range of the ferrite ＋ austenite dual phase zone is from 716 ℃ to 953 ℃ at equilibrium state. The tensile strength increases with the increasing of annealing temperature,while the elongation decreases at first and then increases,reaching the minimum value of 21. 5% at 820 ℃.The fraction of ferrite is the highest after annealing at 800 ℃ or 820 ℃,but the ferrite fraction decreases after annealing treatment at 840 ℃ or860 ℃,the ferrite grains become finer and dispersed,and the content of bainite and retained austenite increases gradually.

关 键 词：高铝TRIP钢 力学性能 组织演变 退火处理 

分 类 号：TG156.2[金属学及工艺—热处理]