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首页> 外文期刊>ISIJ international >Effect of Directional Solidification in Electroslag Remelting on the Microstructure and Cleanliness of an Austenitic Hot-work Die Steel
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Effect of Directional Solidification in Electroslag Remelting on the Microstructure and Cleanliness of an Austenitic Hot-work Die Steel

机译：电渣重熔中定向凝固对奥氏体热作模具钢组织和清洁度的影响

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The current study focuses on the effect of directional solidification in electroslag remelting (ESR) on the removal efficiency of inclusion and the shape of molten metal pool during this refining process as well as on solidification structure of remelted ingot. Two ingots were remelted through traditional ESR process and continuous directional solidification in electroslag remelting (ESR-CDS) process for comparison, respectively. Moreover, a two-dimensional (2D) coupled mathematical model was employed to simulate the temperature field, solidification and velocity fields as well as inclusion motion to reveal the refinement mechanism of inclusion removal, microstructure and carbides during remelting process. The results showed that the macro-segregation of carbon was reduced and the microstructure of columnar grains paralleled to axis of ingot was obtained through ESR-CDS process, together with the refinement of carbides distribution. Moreover, the number and size of inclusions in ingot were much more reduced remelting through ESR-CDS process compared to ESR process. The total number and average diameter of MnS particles are obviously reduced from 689 and 2.28 μ m in S1 ingot to 78 and 1.78 μ m in S2 ingot respectively, remelting through ESR-CDS process. Meanwhile, the number of MnS particles with size >3 μ m is reduced from 15.67% in S1 ingot to 1.28% in S2 ingot, and that with size 1–2 μ m is increased from 49.93% in S1 ingot to 67.95% in S2 ingot. It was found that ESR-CDS technology was beneficial for refinement of microstructure and carbides as well as removal of inclusions, thus achieving considerable improvement in mechanical properties of austenitic hot-work die steel.
机译：当前的研究集中在电渣重熔（ESR）中的定向凝固对精炼过程中夹杂物的去除效率和熔融金属池形状的影响，以及对重熔铸锭的凝固组织的影响。通过传统的ESR工艺和电渣重熔连续定向凝固（ESR-CDS）工艺对两锭进行了重熔，以进行比较。此外，使用二维（2D）耦合数学模型来模拟温度场，凝固场和速度场以及夹杂物运动，以揭示重熔过程中夹杂物去除，微结构和碳化物的细化机理。结果表明，通过ESR-CDS工艺，减少了碳的宏观偏析，获得了与晶锭轴平行的柱状晶粒的微观结构，同时细化了碳化物的分布。此外，与ESR工艺相比，通过ESR-CDS工艺重熔后锭中夹杂物的数量和尺寸大大减少。通过ESR-CDS工艺重熔，MnS颗粒的总数和平均直径分别从S1锭的689和2.28μm分别降低到S2锭的78和1.78μm。同时，尺寸> 3 μm的MnS颗粒数量从S1锭的15.67％减少到S2锭的1.28％，尺寸为1-2μm的MnS颗粒的数量从S1中的49.93％增加S2锭中的锭含量达到67.95％。人们发现，ESR-CDS技术有利于细化组织和碳化物，以及去除夹杂物，从而大大改善了奥氏体热作模具钢的机械性能。

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