Formation and Evolution of Non-Metallic Inclusions in Calcium Treatment H13 Steel during Electroslag Remelting Process
Formation and Evolution of Non-Metallic Inclusions in Calcium Treatment H13 Steel during Electroslag Remelting Process
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钙处理H13钢电渣重熔过程中非金属夹杂物的形成与演化
DOI：
10.2355/isijinternational.isijint-2018-537
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发表时间：
2019-05
影响因子：
1.8
通讯作者：
Yuxiang Dai
中科院分区：
文献类型：
--
作者：
Hao Wang;Jing Li;Chengbin Shi;Yongfeng Qi;Yuxiang Dai
分析了电渣重熔不同钙含量H13钢电极中夹杂物的演变规律，通过实验和热力学计算确定了电渣重熔过程中硫化物和氧化物夹杂物的形成和演变规律。结果表明：重熔锭中夹杂物主要为Al_2O_3、CaO-Al_2 O_3-CaS和CaO-Al_2 O_3-MgO-CaS，超过半数的夹杂物小于3 μm。焊条中钙含量不同，重熔锭的洁净度和夹杂物无明显差异。当固相分数达到0.98时，电极中MnS夹杂物析出。由于重熔锭中S含量较低，凝固坯壳前沿Mn、S偏析减少，MnS夹杂物不能析出。在液态金属液滴进入熔池之前，低熔点夹杂物已完全溶解消失。电渣重熔过程中局部冷却强度的差异和熔池中液态夹杂物中较高的Al 2 O3含量促进了重熔锭中大量微小Al 2 O3夹杂物的形成。
In the current study, the evolution of inclusions in H13 steel electrode with different Ca content refined through ESR process were analyzed, the formation and evolution of sulfide and oxide inclusions during ESR process was determined based on experiments and thermodynamic calculation. The results showed: The inclusions of remelted ingot were Al2O3, CaO–Al2O3–CaS and CaO–Al2O3–MgO–CaS, more than half of the total inclusions were smaller than 3 μm. The cleanliness and inclusions of remelted ingot had no difference with different Ca content in electrode. MnS inclusions in electrode precipitated while the solid fraction reached 0.98. MnS inclusions cannot precipitate due to the low level of S content in remelted ingot and the decrease of Mn and S segregation on the front edge of solidified shell. The low-meltingtemperature inclusions were dissolved and disappeared completely before liquid metal droplets collected in the liquid metal pool. The different of local cooling intensity during ESR process and high Al2O3 content of liquid inclusion in molten pool promoted the formation of large amount of tiny Al2O3 inclusions in remelted ingot.