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René88DT镍基合金(%:0.02～0.05C、15.5～16.5Cr、3.8～4.2Mo、≤0.20Ta、12.5～13.5Co、0.6～1.0Nb、0.025～0.050Zr、3.5～3.9Ti、2.0～2.4Al、0.006～0.015B、3.8～4.2W、0.005～0.010Ce)母合金棒由200 kg真空感应炉熔炼,并按照凝固组织显微结构要求,通过控制铸锭凝固的二次枝晶间距和金属熔池形状及深度来确定重熔时熔化的速度,再通过热平衡计算得到相关的熔炼参数,由500 kg气氛保护抽锭式电渣重熔炉按连续定向凝固工艺熔炼出Φ160 mm×220 mm René88DT合金锭结果表明,计算重熔总时间与实际时间的误差仅为4.5%,熔池浅平,凝固组织均匀细小,获得了全〈100〉方向的柱状晶组织,二次枝晶间距为60～80μm。
René88DT nickel base alloy (%: 0.02-0.05C, 15.5-16.5Cr, 3.8-4.2Mo, ≤ 0.20Ta, 12.5-13.5Co, 0.6-1.0Nb, 0.025-0.050Zr, 3.5-3.9Ti, 2.0-2.4Al , 0.006 ~ 0.015B, 3.8 ~ 4.2W, 0.005 ~ 0.010Ce) The master alloy rod is melted by a 200 kg vacuum induction furnace, and according to the microstructure requirements of the solidified structure, by controlling the secondary dendrite spacing solidified in the ingot and the metal melting Pool shape and depth to determine the melting rate of remelting, and then through the heat balance calculation of the relevant melting parameters from 500 kg atmosphere protection of ingot-type ESR furnace by continuous directional solidification process smelting Φ160 mm × 220 mm René88DT alloy ingots The results show that the error between the total remelting time and the actual time is only 4.5%. The melting pool is shallow and the solidified microstructure is even and fine. The columnar crystal structure with the full <100> orientation is obtained. The secondary dendrite spacing is 60-80μm.