冷轧辊用半高速钢碳化物细化工艺技术研究  

Study on the carbide refining technology of semi high speed steel for cold roller

作　　者：林发驹 李雄 吴铖川 Lin Faju;Li Xiong;Wu Chengchuan(Special Steel Research Department,Chengdu Advanced Metal Materials Industrial Technology Institute Co.,Ltd.,Chengdu 610303,Sichuan,China;State Key Laboratory of Marine Equipment Made of Metal Material and Application,Anshan 114009,Liaoning,China)

机构地区：[1]成都先进金属材料产业技术研究院有限公司特钢研究所,四川成都610303 [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

出　　处：《钢铁钒钛》2021年第3期162-171,共10页Iron Steel Vanadium Titanium

摘　　要：基于Thermo-Calc热力学软件计算及原位观察结果,开展冷轧辊半高速钢95Cr5MoV碳化物细化技术研究。95Cr5MoV半高速钢平衡凝固碳化物类型主要有MC、M_(7)C_(3)和M_(23)C_(6),其中M_(23)C_(6)型碳化物在785℃左右完全溶入基体,M_(7)C_(3)型碳化物在1100℃时完全溶入基体,MC型碳化物在1170℃左右完全溶入基体;采用高温共聚焦显微镜试验观察发现,大块状MC型碳化物在960℃时开始溶解,当温度升高到1170℃左右时,溶解加速,但一直到1217℃碳化物周围的基体开始局部熔化时仍然部分存在,表明非平衡态的溶解温度高于平衡态。为细化碳化物,实验室采用"1100℃高温固溶+880℃三次循环+740℃退火"的新热处理工艺后,大块液析碳化物尺寸明显减小,且组织均匀性好,并在工业化生产中验证了该工艺的可靠性。Based on the results of thermos-Calc calculation and in-situ observation,the carbide refinement technology of 95Cr5mMoV cold roll semi high speed steel was studied.The equilibrium solidification carbides of 95Cr5MoV semi high speed steel mainly include MC,M_(7)C_(3) and M_(23)C_(6).Among them,M_(23)C_(6) carbides completely dissolve into the matrix at about 785℃,M_(7)C_(3) carbides completely dissolve into the matrix at 1100℃and MC carbides completely dissolve into the matrix at about 1170℃.It is observed by high temperature confocal microscope that the massive MC carbides begins to dissolve at 960℃,and when the temperature rises to 1170℃,the dissolution accelerates,but it still exists until1217℃,which indicates that the dissolution temperature of non-equilibrium state is higher than that of equilibrium state.In order to refine carbides,the heat treatment process of"1100℃high temperature solid solution+880℃three times circulation+740℃annealing"was adopted in the laboratory.The size of large liquidus carbides decreased obviously,and the microstructure is uniform.The reliability of the process was verified in industrial production.

关 键 词：冷轧辊 半高速钢 碳化物 原位观察 超细化处理 

分 类 号：TF76[冶金工程—钢铁冶金] TG304[金属学及工艺—金属压力加工]