6Cr13Mo不锈钢中碳化物演变规律研究  

Study of carbide evolution in a 6Cr13Mo stainless steel

作　　者：宋令玺 郑淮北 杨亚光[3] 王英虎 Song Lingxi;Zheng Huaibei;Yang Yaguang;Wang Yinghu(Chengdu Advanced Metal Materials Industrial Technolgy Research Institute Co.,Ltd.,Chengdu 610300,Sichuan,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114009,Liaoning,China;Pangang Group Jiangyou Changcheng Special Steel Co.,Ltd.,Mianyang 621700,Sichuan,China)

机构地区：[1]成都先进金属材料产业技术研究院股份有限公司,四川成都610300 [2]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [3]攀钢集团江油长城特殊钢有限公司,四川绵阳621700

出　　处：《钢铁钒钛》2022年第3期161-166,共6页Iron Steel Vanadium Titanium

摘　　要：采用Thermo-Calc热力学软件对6Cr13Mo不锈钢进行了相图计算,利用超高温共聚焦显微镜模拟了6Cr13Mo不锈钢加热、冷却及凝固过程,观察分析了碳化物的演变规律。结果表明:相图计算的6Cr13Mo不锈钢平衡室温组织为铁素体和MC类型碳化物;凝固过程中成分发生凝固偏析,当液相中C含量达到约为1%时,成分体系变为亚共晶钢体系,在析出奥氏体的同时,液相中直接析出MC类型的碳化物;加热过程中,随着温度升高,碳化物呈先增加后减少趋势;降温过程中,随着温度降低,碳化物逐渐增多,且在800℃时达到峰值;凝固过程中,随着凝固速率的提高,MC数量减少且形态改变。Thermo-Calc thermodynamic software was used to calculate the phase diagram of 6Cr13Mo stainless steel.The heating,cooling,and solidification processes of 6Cr13Mo stainless steel were simulated via an ultra-high temperature confocal microscope,and the evolution of carbide was observed and analyzed.The results show that the room temperature microstructure of 6Cr13Mo stainless steel calculated by phase diagram is ferrite and M_(23)C_(6) type carbides.During the solidification process,the components undergo solidification segregation.The composition system changes into the hypoeutectic steel system when the content of C in the liquid phase reaches about 1%,and MCtype carbides precipitate directly from the liquid phase while austenite precipitates.During the heating process,the carbide first increases and then decreases with the increase in temperature.During the cooling process,the carbide gradually increases with the decrease of temperature and reaches a peak at 800℃.During the solidification process,the number of MCdecreases,and the morphology changes with the increase in the solidification rate.

关 键 词：6Cr13Mo不锈钢 凝固 偏析 M23C6碳化物 M7C3碳化物 凝固速率 

分 类 号：TF76[冶金工程—钢铁冶金] TG142.71[一般工业技术—材料科学与工程]