H13模具钢电渣锭中夹杂物的类型以及分布规律分析  

Analysis of the Types and Distribution of Inclusions in H13 Die Steel Electroslag Ingots

作　　者：倪卓文 朱红春 李花兵 姜周华 孙正鑫 何志禹 Ni Zhuowen;Zhu Hongchun;Li Huabing;Jiang Zhouhua;Sun Zhengxin;He Zhiyu(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,沈阳110819

出　　处：《特殊钢》2024年第6期48-52,共5页Special Steel

基　　金：国家自然科学基金资助(Nos.52374330/52325406)。

摘　　要：使用2t电渣重熔炉进行H13模具钢的制备。结合热力学计算、实验观察与统计分析,系统地研究了熔速为0.12kg/s条件下H13模具钢在电渣锭中的夹杂物类型、尺寸、形貌以及分布规律。结果表明,H13模具钢中主要的夹杂物类型为MgO·Al_(2)O_(3)和球形的CaO·MgO·Al_(2)O_(3)。在电渣重熔过程中,MgO·Al_(2)O_(3)夹杂物会演变为MgO·Al_(2)O_(3)+CaO·Al_(2)O_(3)混合类型夹杂物或者CaO·MgO·Al_(2)O_(3)类夹杂物。同时,会有少量的S以各类夹杂物为形核质点进行析出,析出的成分主要为CaS,生成CaS包裹的CaO·MgO·Al_(2)O_(3)类夹杂物。在电渣锭中夹杂物尺寸主要以<5μm为主,5~<10μm的夹杂物较少,≥10μm的夹杂物仅有少量存在。这与电极中夹杂物的分布类似,但总体的夹杂物数量有所减少。径向分布呈现先增加再减少的趋势,在二分之一半径附近出现夹杂物的富集。The H13 die steel was prepared by 2 t electroslag remelting furnace.Combined with thermodynamic calculation,experimental observation and statistical analysis,the type,size,morphology and distribution of inclusions in H13 die steel in electroslag ingot under a melting rate of 0.12 kg/s were systematically studied.The results show that the main inclusions in H13 die steel are MgO·Al_(2)O_(3) and spherical CaO·MgO·Al_(2)O_(3).During the remelting process of electric slag,MgO·Al_(2)O_(3) inclusion evolves into MgO·Al_(2)O_(3)+CaO·Al_(2)O_(3) mixed type inclusion or class CaO·MgO·Al_(2)O_(3) inclusion.At the same time,a small amount of S will be precipitated with various inclusions as nucleation particles.The precipitated component is mainly CaS,forming CaO·MgO·Al_(2)O_(3) inclusions wrapped by CaS.The size of inclusions in the electroslag ingot is mainly less than 5μm,5-10μm inclusions are less,and only a small amount of inclusions larger than 10μm exist.The distribution is similar to that of the electrode,but the overall number of inclusions is reduced.The radial distribution shows a trend of increasing first and then decreasing,and the enrichment of inclusions occurs near half of the radius.

关 键 词：电渣重熔 H13模具钢 夹杂物类型 夹杂物分布 

分 类 号：TF132[冶金工程—冶金物理化学]