预处理工艺对中锰TRIP钢微观组织和力学性能的影响  

Effect of pretreatment process on microstructure and mechanical properties of medium manganese TRIP steel

作　　者：张光莹 定巍[1] 李岩[1,2] 冯继科 董瑞 Zhang Guangying;Ding Wei;Li Yan;Feng Jike;Dong Rui(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014000,China;Bayan OboMultimetallic Resource Comprehensive Utilization Key Lab,Baotou Inner Mongolia 014000,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014000 [2]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014000

出　　处：《金属热处理》2023年第5期259-264,共6页Heat Treatment of Metals

基　　金：内蒙古自然科学基金(2020LH05026,2019MS05014,2021SHZR0691)。

摘　　要：利用扫描电镜(SEM)、X射线衍射仪(XRD)和拉伸试验机等系统研究了0.2C-5Mn-1.5Al-0.5Si中锰TRIP钢经不同预处理及临界退火处理后的微观组织演变和力学性能变化。结果表明,缩短预处理时间,不影响珠光体含量,但是能细化铁素体与马氏体晶粒;730℃临界退火5 min时,试验钢组织中皆出现了块状和薄膜状的两种残留奥氏体,而预处理时间更短的试验钢中奥氏体与铁素体晶粒更细;预处理时间短的试验钢抗拉强度和断后伸长率整体高于预处理时间更长的试验钢,并在预处理时间较短的工艺下,退火后获得最佳力学性能:断后伸长率为34%,强塑积为34.34 GPa·%,在拉伸过程中没有屈服延伸现象,具有良好的加工硬化能力。Microstructure evolution and change of mechanical properties of the 0.2C-5Mn-1.5Al-0.5Si medium manganese TRIP steel after different pretreatments and intercritical annealing treatment were systematically studied by means of scanning electron microscope(SEM),X-ray diffractometer(XRD)and tensile testing machine.The results show that with the shortening of pretreatment time,the pearlite content does not change,but the ferrite and martensite grains are refined.When intercritically annealed at 730℃for 5 min,two kinds of retained austenite in the form of block and film appear in the microstructure.The grains of austenite and ferrite in the steel under shorter pretreatment time are finer.It is found that the tensile strength and elongation of the tested steel under shorter pretreatment time are generally higher than those under longer pretreatment time.Under the process with a shorter pretreatment time,the optimal mechanical properties are obtained after annealing,with elongation of 34%,the product of strength and elongation of 34.34 GPa·%,and there is no yield extension phenomenon during the tensile process,with good work hardening ability.

关 键 词：中锰TRIP钢 预处理 组织演变 力学性能 奥氏体 

分 类 号：TG142.1[一般工业技术—材料科学与工程]