N06625 nickel-based alloy plates were produced by two different process routes, namely VIM+ESR and EAF+AOD+continuous casting. The segregation characteristics, microstructure and mechanical properties were systematically investigated by means of mechanical testing machine, optical microscope, SEM, EDS and electron probe microanalyzer. The results show that the segregation degrees of Mo and Nb in the continuous casting slab are lower than those in the conventional electroslag ingot, providing favorable conditions for subsequent homogenization treatment and hot working. Owing to the finer original dendrites and milder segregation, the continuous casting slab requires a shorter homogenization holding time to eliminate elemental segregation and exhibits better process applicability. Under the actual production conditions in this work, the optimal homogenizati
600 mm electroslag ingot are 1 240 ℃ for 48 h, while the parameters for the 180 mm-thick continuous casting slab are 1 240 ℃ for 36 h. The mechanical properties, inclusion characteristics and corrosion resistance of the plates manufactured by the two process routes are at the same technical level. The corrosion rates of the VIM+ESR route measured by ASTM G28A, ASTM A262C and ASTM G48A are 0.024 mm/month, 0.03 mm/month and 0 g/m
2
, respectively; the corresponding values of the EAF+AOD+continuous casting route are 0.021 mm/month, 0.03 mm/month and 0 g/m
Chen X M , Lin Y C , Chen M S , et al . Microstructural evolution of a nickel-based superalloy during hot deformation [J]. Materials & Design , 2015 , 77 : 41 - 49 .
Wang J , Dong J X , Zhang M C , et al . Hot working characteristics of nickel-base superalloy 740H during compression [J]. Materials Science and Engineering: A , 2013 , 566 : 61 - 70 .
Zhang P , Hu C , Zhu Q , et al . Hot compression deformation and constitutive modeling of GH4698 alloy [J]. Materials & Design (1980-2015), 2015 , 65 : 1153 - 1160 .
Jiang H , Yang L , Dong J X , et al . The recrystallization model and microstructure prediction of alloy 690 during hot deformation [J]. Materials & Design , 2016 , 104 : 162 - 173 .