连铸对M2高速钢偏析与碳化物的影响  

Effect of continuous casting on segregation and carbide of M2 high speed steel

作　　者：姚健 满廷慧 刘宇 朱喜达[3] 董瀚 YAO Jian;MAN Ting-hui;LIU Yu;ZHU Xi-da;DONG Han(School of Materials and Science Engineering,Shanghai University,Shanghai 200444,China;Zhejiang Institute of Advanced Materials,SHU,Jiashan 314113,Zhejiang,China;Jiangyin China Resources Steelmaking Co.,Ltd.,Jiangyin 214404,Jiangsu,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]上海大学(浙江)高端装备基础件材料研究院,浙江嘉善314113 [3]江阴华润制钢有限公司,江苏江阴214404

出　　处：《中国冶金》2023年第3期77-84,共8页China Metallurgy

摘　　要：为了加快实现M2高速钢连铸工业生产,改善M2连铸坯组织均匀性、降低宏观偏析、细化碳化物、提高铸坯内部质量,采用金属原位分析仪、直读光谱仪、扫描电子显微镜、X射线衍射仪等手段研究弧形连铸工艺生产M2高速钢弧形的铸态组织以及热加工后组织情况,特别是宏观偏析和碳化物演变,并与模铸工艺生产M2高速钢进行对比。结果表明,M2高速钢弧形连铸坯的碳化物最大尺寸相比于模铸情况降低了约44%,二次枝晶间距降低约20%;另外,连铸坯碳化物呈纤维状,经过高温热处理后更易分解,碳化物得到了进一步细化;锻轧后,连铸坯碳化物尺寸均匀,无明显大块碳化物,最大碳化物尺寸小于10μm。In order to improve the internal quality of continuous casting billet including the structure uniformity, macro-segregation and carbides for accelerating the industrialization of continuous casting, the microstructures of M2 high speed steel produced by curved continuous casting and following hot working processes, especially macro-segregation and carbide evolution, were investigated using metal in-situ analyzer, direct reading spectrometer, scanning electron microscope and X-ray diffractometer, and they were compared to that produced by ingot casting. The results show that the maximum size of carbide and secondary dendrite spacing in the curved continuous casting M2 high speed steel are reduced by approximately 44% and 20%, respectively, compared to that of the ingot casting M2 high speed steel. In addition, the morphology of carbide presents fibrous, and after heat treatments it will be decomposed and refined. Furthermore, the size of carbide exhibits more uniform for the curved continuous casting M2 high speed steel after forging-rolling, there is no obvious large carbide and the maximum size of carbide is less than 10 μm.

关 键 词：M2高速钢 弧形连铸 宏观偏析 碳化物 热加工 

分 类 号：TF777[冶金工程—钢铁冶金] TG142.1[一般工业技术—材料科学与工程]