两相区退火温度对2%Al冷轧TRIP钢组织及性能的影响  

Effect of intercritical annealing temperature on microstructure and mechanical properties of 2%Al cold rolled TRIP steel

作　　者：赵阳[1] 袁晓云[2] 陈礼清[2] 刘相华[1,2] 

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《辽宁科技大学学报》2017年第1期10-13,37,共5页Journal of University of Science and Technology Liaoning

基　　金：国家自然科学基金资助项目(51501031);青年教师科研启动基金(N140203001)

摘　　要：两相区退火温度是影响TRIP钢显微组织和力学性能的重要工艺参数之一,因此有必要优化两相区退火温度使TRIP钢获得最佳的强韧性配合。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)和拉伸试验机研究了两相区退火温度对0.25C-1.5Mn-2.0Al冷轧TRIP钢显微组织和力学性能的影响。实验结果表明:在770~850℃退火并450℃贝氏体等温5 min处理后,实验钢的显微组织为铁素体、贝氏体和残余奥氏体。随着退火温度的升高,实验钢中的铁素体和残余奥氏体体积分数增加、贝氏体体积分数减少,屈服强度和抗拉强度降低。The intercritical annealing temperature is an important parameter which affects obviously the micro- structure and mechanical properties of TRIP steels, so it is essential to optimize the intercritical annealing tem- perature to obtain the extraordinary combination of strength and ductility. The effect of intercritical annealing temperature on microstructure and mechanical properties of 0.25C-1.5Mn-2.0A1 cold rolled TRIP steel was in- vestigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffrac- tion （XRD）, and tensile test. The results show that the microstructure is composed of ferrite, bainite, and re- tained austenite after annealed at 770-850 ℃ and subsequently bainitic isothermal treated at 450 ℃ for 5 min. The volume fractions of ferrite and retained austenite increase with increasing the annealing temperature, while the volume fraction of bainite decreases. The yield strength and tensile strength decrease with increasing the annealing temperature.

关 键 词：含Al TRIP钢 退火温度 显微组织 力学性能 

分 类 号：TG113.1[金属学及工艺—物理冶金]