摘要
对5%Mn冷轧中锰钢进行930℃×20 min淬火后再进行660、665、675、685℃保温30 min的逆相变退火处理,并用光学显微镜、扫描电镜、X射线衍射仪等研究退火温度对中锰钢组织和力学性能的影响。结果表明:5%Mn冷轧中锰钢经过高温淬火和逆相变退火后的组织为超细晶铁素体、板条马氏体和奥氏体。随着逆相变退火温度由660℃增加至685℃,奥氏体含量先增加后降低并在665℃逆相变退火后达到最大值,抗拉强度持续增加,屈服强度先升高后降低并在675℃退火时达到最大,伸长率先升高后降低并在665℃时达到最大值。综合来看,5%Mn中锰钢冷轧板经过930℃×20 min淬火和665℃×30 min逆相变退火后的综合力学性能最佳,此时奥氏体体积分数为24.24%,抗拉强度为980 MPa,伸长率为23.68%,强塑积达到了23.21GPa·%。
Effect of annealing temperature on microstructure and mechanical properties of a 5%Mn cold rolled medium manganese steel after quenching at 930 ℃ for 20 min and then reverse phase transformation annealing respectively at 660, 665, 675 and 685 ℃ for 30 min were studied by means of OM, SEM and XRD. The results show that after high temperature quenching and reverse phase transformation annealing, the microstructure of the 5%Mn cold rolled medium manganese steel is composed of ultra-fine-grained ferrite, lath martensite and austenite. As the reverse phase transformation annealing temperature increases from 660 ℃ to 685 ℃, the austenite content increases first then decreases and reaches the maximum value at 665 ℃, the tensile strength increases continuously, the yield strength increases first then decreases and reaches the maximum value at 675 ℃, and the elongation increases first then decreases and reaches the maximum value at 665 ℃. In conclusion, the comprehensive mechanical properties are the best for the 5%Mn cold rolled medium manganese steel after quenching at 930 ℃ for 20 min and then reverse phase transformation annealing at 665 ℃ for 30 min, at which the volume fraction of austenite is 24.24%, the tensile strength is 980 MPa, the elongation is 23.68%, and the product of strength and plasticity is 23.21 GPa·%.
作者
樊立峰
亢泽
贾丽英
徐惠敏
高军
Fan Lifeng;Kang Ze;Jia Liying;Xu Huimin;Gao Jun(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;Technology Center,HBIS GroupHansteel Company,Handan Hebei 056015,China;CSP Plant of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou Inner Mongolia 014010,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第7期92-97,共6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)
内蒙古自治区级大学生创新创业训练计划(202010128014)
内蒙古自治区研究生科研创新项目(S20191140Z)。
关键词
冷轧中锰钢
退火温度
微观组织
力学性能
cold-rolled medium manganese steel
annealing temperature
microstructure
mechanical properties
作者简介
樊立峰(1980—),男,副教授,博士,主要研究方向为电工钢新技术、汽车钢轻量化技术等,E-mail:fanlifeng829@163.com。
