Cr12MoV钢铸坯夹杂物及碳化物解析  

Analysis of inclusions and carbides in mold casting billets of Cr12MoV steel

作　　者：伦明睿 沈平 刘斌 付建勋 Lun Mingrui;Shen Ping;Liu Bin;Fu Jianxun(School of Materials Science and Engineering,Shanghai University,Center for Advanced Solidification Technology,State Key Laboratory of Advanced Special Steel,Shanghai 200444,China;Ansteel Beijing Reasearch Institude Co.,Ltd.,Beijing 102209,China)

机构地区：[1]上海大学材料科学与工程学院,先进凝固技术中心,省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]鞍钢集团北京研究院有限公司,北京102209

出　　处：《钢铁钒钛》2024年第5期158-166,共9页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金资助项目(52074179)。

摘　　要：使用Factsage热力学软件计算Cr12MoV冷作模具钢中不同相的转变、不同夹杂物和碳化物析出情况,OM与SEM等对模铸坯的夹杂物与碳化物进行解析。研究表明,Cr12MoV钢中主要是不规则稀土复合氧硫化物和硫化物夹杂,具体为Ce_(2)S_(3)、Ce_(2)O_(2)S和La_(2)S_(3)夹杂,而Al_(2)O_(3)和MnS夹杂经过稀土元素的改质后,几乎都以稀土复合氧硫化物和硫化物夹杂形式存在于模铸坯中,夹杂物密度和面积比例分别为102~136个/mm^(2)和0.06%~0.15%,夹杂物等效直径集中分布于2.5~3.0μm。Cr12MoV冷作模具钢中含有大量碳化物,其类型为富Fe和Cr的M_(23)C_(6)型的共晶碳化物,铸坯心部的碳化物平均等效直径为4.9μm,边部化物平均等效直径为3.7μm,从铸坯边部到心部碳化物面积比例为2.94%~4.31%。The transformation of different phases,the precipitation of inclusions and carbides in the Cr12MoV cold work die steel were calculated using Factsage thermodynamic software.The inclusions and carbides of the mold casting billets were analyzed using OM and SEM.It is shown that Cr12MoV steel is dominated by irregular rare-earth complex oxygen sulfide and sulfide inclusions,specifically Ce_(2)S_(3),Ce_(2)O_(2)S and La_(2)S_(3)inclusions.The Al_(2)O_(3)and the MnS inclusions exist in the mold-cast billet in the form of rare-earth complex oxygen sulfide and sulfide inclusions after modification by rare earth elements.The density and area ratio of inclusions are 102~136 pieces/mm^(2)and 0.06%~0.15%,respectively.The equivalent diameters of inclusions are mainly in the range of 2.5~3.0μm.Cr12MoV cold work mold steel contains a large number of carbides,in which the carbides are Fe-riched and Crriched eutectic carbides of M_(23)C_(6)type.The average equivalent diameter of carbides in the center of billets is 4.9μm and 3.7μm at the edge.The area proportion of carbides from the edge to the center of billets ranges from 2.94%to 4.31%.

关 键 词：CR12MOV 模铸坯 稀土 夹杂物 碳化物 

分 类 号：TF76[冶金工程—钢铁冶金]