Mn含量对超低碳贝氏体钢连续冷却转变规律的影响  

Effect of Mn content on continuous cooling transformation of ultra-low carbon bainitic steel

作　　者：梅涛 刘静[1] 柴希阳[2] Mei Tao;Liu Jing;Chai Xiyang(State Key Laboratory of Refractory Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;Research Institute of Structural Steels,Central Iron and Steel Co.,Ltd.,Beijing 100081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]钢铁研究总院有限公司工程用钢研究院,北京100081

出　　处：《金属热处理》2024年第12期157-163,共7页Heat Treatment of Metals

摘　　要：使用热膨胀仪测定了Mn含量分别为1.5%、1.8%和2.1%的3种超低碳贝氏体钢相变点,结合光学显微镜(OM)、扫描电镜(SEM)观察以及维氏硬度测量,绘制了3种试验钢的连续冷却转变(CCT)曲线,分析了Mn含量变化对相变点、CCT曲线、组织以及硬度的影响。结果表明,Mn含量提升引起的Mn当量变化会影响贝氏体转变温度,此外Mn含量的提升会使试验钢Ac_(3)呈现下降的趋势,且硬度也得到提升。Phase transition points of three ultra-low carbon bainitic steels with Mn contents of 1.5%,1.8%,and 2.1%,respectively,were determined using a thermal expansion meter,and the continuous cooling transformation(CCT)curves of the three tested steels were plotted in conjunction with optical microscopy(OM)and scanning electron microscopy(SEM)observation and Vickers hardness measurements.The effects of Mn content on phase transformation points,CCT curves,microstructure and hardness were analyzed.The results show that the change of Mn equivalent caused by the increase of Mn content affects the bainite transformation temperature.In addition,the increase of Mn content makes the Ac_(3) of the tested steel show a downward trend,and the hardness is also improved.

关 键 词：超低碳贝氏体钢 MN含量 CCT曲线 粒状贝氏体 板条状贝氏体 

分 类 号：TG142[一般工业技术—材料科学与工程]