The electrode of René88DT nickel allov ( % ： 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

2.0〜2.4AI

0.006〜0.015B

3.8〜4.2W

0.005 ~ 0.010Ce) is melted by a 200 kg vacuum induction furnace and the Φ160 mm x 220 mm René88DT alloy ingot is melted by a 500 kg shielding atmosphere drawing-out ingot electroslag remelting furnace with continuously directional solidification process according to requirement of solidified structure to determine the melting speed during remelting by controlling secondary dendrite area space in ingot solidification

metal bath shape and depth and to get relative remelting parameters by thermal equilibrium calculation. Results show that the relative error between calculated total remelting time and real remelting time is only 4.5%

the bath is hallow lo get fine solidified structure with whole 〈100〉 direction columnar structure and secondary dendrite area space- 60 〜80 μm