加热速率与保温温度对NM400钢淬火组织与性能的影响  

Effect of heating rate and holding temperature on quenching microstructure and properties of NM400 steel

作　　者：许立雄 马瑞杰[1] 李春明[1] 金东浩 贾晓航 武会宾 XU Li-xiong;MA Rui-jie;LI Chun-ming;JIN Dong-hao;JIA Xiao-hang;WU Hui-bin(South China Metallurgical Engineering Technology,Wuhan 430200,China;Collaborative Innovation Center of Steel Technology,University of Science&Technology Beijing,Beijing 100089,China)

机构地区：[1]中冶南方工程技术有限公司,湖北武汉430200 [2]北京科技大学钢铁共性技术协同创新中心,北京100089

出　　处：《材料热处理学报》2024年第2期139-147,共9页Transactions of Materials and Heat Treatment

摘　　要：使用DIL805A型相变膨胀仪模拟了NM400型热轧板带钢感应热处理的加热和冷却过程,研究了加热速率和保温温度对其原始奥氏体晶粒尺寸、组织特征和硬度的影响。结果表明:加热速率对实验钢原始奥氏体晶粒尺寸有较大的影响,随着加热速率的增大,原始奥氏体晶粒尺寸逐渐减小,在80℃/s快速加热速率下原始奥氏体晶粒尺寸约为26.6μm,淬火马氏体板条群明显细化,硬度为413.9 HV。保温温度对冷却过程中的过冷度有显著的影响,随着保温温度的升高,过冷度增加,淬火后马氏体含量逐渐增多;当保温温度升高至1010℃时,淬火后实验钢的组织为全马氏体组织,硬度为409.3 HV。The heating and cooling processes of induction heat treatment of NM400 hot rolled strip steel were simulated using DIL805A phase change dilatometer.The effect of heating rate and holding temperature on the original austenite grain size,microstructure characteristics and hardness of the experimental steel was studied.The results show that the heating rate has a significant impact on the original austenite grain size of the experimental steel.As the heating rate increases,the original austenite grain size gradually decreases.At a rapid heating rate of 80 ℃/s,the original austenite grain size is about 26.6 μm,the quenched martensite packet is obviously refined,and the hardness is 413.9 HV.The holding temperature has a significant impact on the undercooling during the cooling.As the holding temperature increases,the undercooling increases,and the martensite content gradually increases after quenching.When the holding temperature rises to 1010 ℃,the microstructure of the quenched experimental steel is martensite,with a hardness of 409.3 HV.

关 键 词：加热速率 保温温度 原始奥氏体晶粒 淬火马氏体 显微硬度 

分 类 号：TG142.3[一般工业技术—材料科学与工程]