H13模具钢模铸坯夹杂物及碳化物分布解析  

Distribution analysis of inclusion and carbide in H13 die steel die casting billet

作　　者：刘松涛 王奕 朱浩然 季灯平 刘斌 付建勋 LIU Songtao;WANG Yi;ZHU Haoran;JI Dengping;LIU Bin;FU Jianxun(Center for Advanced Solidification Technology,School of Materials Science and Engineering,Shanghai University,State Key Laboratory of Advanced Special Steel,Shanghai 200444,China;Zhejiang Qingshan Iron and Steel Co.,Ltd.,Lishui 323000,China;Angang Group Beijing Research Institute,Beijing 102200,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]浙江青山钢铁有限公司,浙江丽水323000 [3]鞍钢集团北京研究院,北京102200

出　　处：《冶金分析》2023年第12期8-16,共9页Metallurgical Analysis

基　　金：国家自然科学基金(52074179)。

摘　　要：H13(4Cr5MoSiV1)钢是目前使用量最大的一种热作模具钢,钢中夹杂物和碳化物是影响性能及服役寿命的关键因素。实验在Thermo-Calc热力学软件分析基础上,采用金相显微镜、扫描电子显微镜、非水溶液电解装置等装备对某厂H13模铸坯中夹杂物、碳化物的分布规律进行解析。研究表明:夹杂物在H13模铸坯边部至中心,等效直径D≤3μm的小尺寸夹杂物逐渐减少,D≥5μm的大尺寸夹杂物逐渐增加,夹杂物的等效直径由2.82μm增大至3.86μm,密度由177个/mm^(2)减少至47个/mm^(2),面积占比[0.057%,0.098%];夹杂物类型以MnS和Al2O3为主,检测结果与计算结果一致;H13碳化物从边部至心部,形态演变规律为:颗粒状、块状、片状、长条状,尺寸从几微米至100μm不等;主要为深灰色富V类MC型碳化物、亮白色富Mo类M6C型碳化物、浅灰色富Cr类M23C6型碳化物。H13(4Cr5MoSiV1)steel is one of the most widely used hot-working die steels at present.The inclusions and carbides in steel are the key factors affecting its performance and service life.The distribution law of inclusions and carbides in the H13 die casting billet was analyzed with metallographic microscope,scanning electron microscope and non-aqueous electrolyzer based on the analysis by Thermo-Calc software.The results showed that:from edge to core of H13 die casting billet,the small inclusions with equivalent diameter D≤3μm gradually decreased,while the large inclusions of D≥5μm gradually increased.The equivalent diameter of inclusions increased from 2.82μm to 3.86μm,the density of inclusions decreased from 177 to 47 PCS/mm^(2),and the area ratio was[0.057%,0.098%].The inclusion types were mainly MnS and Al2O3,which was consistent with the calculated results.The morphologies of carbides in H13 from edge to core were changed as follows:granular,massive,flake,and long-strip.The size ranged from a few microns to 100μm.They were mainly dark gray V-rich MC carbides,bright white Mo-rich M6C carbides,and light gray Cr-rich M23C6 carbides.

关 键 词：H13模具钢 模铸坯 夹杂物 碳化物 热作模具钢 

分 类 号：O7661[理学—晶体学] TG115.213[金属学及工艺—物理冶金] TF031[金属学及工艺—金属学]