The oxygen and nitrogen content of GH3128 alloy with two smelting processes of "VIM + ESR" and "NVIM + ESR" are measured by oxygen nitrogen analyzer

and the thermodynamic calculation of deoxidation and denitrifiation has been carried out. The composition

size distribution and quantity of inclusions in GH3128 alloy with two smelting processes are analyzed by ASPEX SEM . The results show that： The process of M VIM + ESR" can remove the N in the alloy more effectively

the inclusions are mainly Al-Ti-0 composite oxide inclusions

with a small number of Al

2

O

3

and TiO

x

oxide inclusions

the inclusions in alloy by process of "NVIM + ESR" are not only oxide inclusions

but also sulfide and nitride inclusions. And uses the vacuum smelting process can effectively reduce the number of inclusions

and refine the inclusion.