一种无碳化物贝氏体钢的CCT与TTT曲线  

CCT and TTT curves of a carbide-free bainitic steel

作　　者：杨斯媛 李爱国 罗平 张文良 李贤君 张明皓 安伟骋 王恺择 Yang Siyuan;Li Aiguo;Luo Ping;Zhang Wenliang;Li Xianjun;Zhang Minghao;An Weicheng;Wang Kaize(China Academy of Machinery Beijing Research Institute of Mechanical&Electrical Technology Co.,Ltd.,Beijing 100083,China;China Academy of Machinery Science and Technology Group Co.,Ltd.,Beijing 100089,China;School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国机械总院集团北京机电研究所有限公司,北京100083 [2]中国机械科学研究总院集团有限公司,北京100089 [3]北京科技大学机械工程学院,北京100083

出　　处：《金属热处理》2025年第2期74-80,共7页Heat Treatment of Metals

摘　　要：利用DIL-805A相变仪对无碳化物贝氏体钢开展过冷奥氏体连续冷却转变和等温转变试验,获得了试验钢的CCT曲线和TTT曲线。结果表明,试验钢的奥氏体开始转变温度和终止转变温度分别760℃和860℃,马氏体开始转变温度约为300℃。当冷却速度在0.1~15℃/s之间,过冷奥氏体主要转变为贝氏体+马氏体复相组织;冷却速度在15~50℃/s之间,过冷奥氏体全部转变为马氏体组织;随着冷却速度增加,试验钢硬度增加,最高可达740 HV0.5。当试验钢进行等温转变时,其贝氏体转变温度范围为300~400℃,“鼻尖”温度约为360℃。Continuous cooling transformation and isothermal transformation tests of undercooled austenite were carried out on a carbide-free bainitic tested steel by using the DIL-805A phase transformation tester.The CCT and TTT curves of the tested steel were obtained.The results show that the starting and ending transformation temperatures of austenite of the tested steel are 760℃and 860℃,respectively,and the starting transformation temperature of martensite is approximately 300℃.When the cooling rate is between 0.1-15℃/s,the undercooled austenite mainly transforms to bainite+martensite complex structure.When the cooling rate is between 15-50℃/s,the undercooled austenite transforms into martensite.The microhardness of the tested steel increases with the increase of cooling rate,up to 742 HV0.5.When the tested steel undergoes isothermal transformation,the bainite transformation temperature range is 300-400℃,and the"nose tip"temperature is about 360℃.

关 键 词：无碳化物贝氏体钢 CCT曲线 TTT曲线 

分 类 号：TG151.3[金属学及工艺—热处理]