The cracking defects of the Ni-base corrosion-resistant alloy N10276 produced by duplex process of 3 t vacuum induction melting furnace + 3 t electroslag remelting ingot are greatly easy to appear in the process of cogging. The defects are analyzed by means of microstructure characterization

energy spectrum detection and transmission electron microscope calibration. The re-dissolved conditions of precipitates are determined by thermodynamic calculation and differential scanning calorimetry. The improvement measures are verified by thermal compression simulation. The results show that the μ phase precipitated in the alloy is the direct reason for cracking in the process of forging cogging. When the alloy is annealed above 1 110 ℃ for a long time

the precipitates can be redissolved. After the homogenization process is improved from 1 150 X. for 24 h to 1 190 °C for 36 h

the precipitates in the alloy are fully dissolved. The simulation of the hot compression test exhibits that the hot workability of the alloy is improved obviously after process improvement

and the cogging cracking can be avoided.