逆相变退火时间对5%Mn冷轧中锰钢显微组织和力学性能的影响  

Effect of reverse phase transformation annealing time on microstructure and mechanical properties of 5%Mn cold-rolled medium manganese steel

作　　者：樊立峰[1,2] 郭芷毓 张志朋 岳尔斌 肖丽俊[4] 高军[5] 何建中[5] Fan Lifeng;Guo Zhiyu;Zhang Zhipeng;Yue Erbin;Xiao Lijun;Gao Jun;He Jianzhong(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China;Engineering Research Center of Rare Earth Metals,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China;Jiangsu Metallurgical Technology Research Institute,Zhangjiagang Jiangsu 215600,China;Central Iron and Steel Research Institute Company Limited,Beijing 100081,China;Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou Inner Mongolia 014010,China)

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]内蒙古工业大学稀土金属材料工程研究中心,内蒙古呼和浩特010051 [3]江苏冶金技术研究院,江苏张家港215600 [4]钢铁研究总院有限公司,北京100081 [5]内蒙古包钢钢联股份有限公司,内蒙古包头014010

出　　处：《金属热处理》2023年第6期29-35,共7页Heat Treatment of Metals

基　　金：内蒙古自然科学基金(2020MS05006);内蒙古科技攻关计划(2020GG0265);内蒙古重点研发和成果转化计划(2022YFHH0079);中央引导地方科技发展计划(2022ZY0001);内蒙古自治区高校青年科技人才计划(NJYT23116)。

摘　　要：采用光学显微镜、扫描电镜、透射电镜、X射线衍射仪研究5%Mn冷轧中锰钢逆相变退火时间对显微组织和力学性能的影响。结果表明,冷轧中锰钢经930℃淬火20 min、675℃逆相变退火5~40 min后的组织为马氏体、超细晶铁素体和不同体积分数奥氏体。保温5 min时,组织延续淬火态的板条马氏体,奥氏体体积分数只有8.5%;随着保温时间延长至10、20、30 min,奥氏体体积分数分别增加至10.56%、19.7%、22.34%,但保温时间继续延长至40 min时,奥氏体体积分数降低至20.53%。随着保温时间的增加,抗拉强度持续增加,断后伸长率、强塑积均先升高后降低,强塑积在30 min时达到最大值,此时综合力学性能最好。Effect of reverse phase transformation annealing time on microstructure and mechanical properties of 5%Mn cold-rolled medium manganese steel was studied by means of optical microscope,scanning electron microscope,transmission electron microscope,and X-ray diffraction.The results show that the microstructure of the cold-rolled medium manganese steel after quenching at 930℃for 20 min and reverse phase transformation annealing at 675℃for 5-40 min is also martensite,ultra fine grain ferrite and austenite with different volume fractions.When holding time is 5 min,the microstructure continues to be quenched lath martensite,and the volume fraction of austenite is only 8.5%.As the holding time extendes to 10,20,and 30 min,the volume fraction of austenite increases to 10.56%,19.7%,and 22.34%,respectively,while the holding time continues to extend to 40 min,the austenite volume fraction decreases to 20.53%.With the increase of holding time,the tensile strength continues to increase,and the elongation,product of strength and elongation increases first and then decreases,the product of strength and elongation reaches the maximum at 30 min,and the comprehensive mechanical properties are the best.

关 键 词：中锰钢 奥氏体 强塑积 偏聚 

分 类 号：TG142.1[一般工业技术—材料科学与工程]