Denitrogenation and desulphurization during vacuum induction melting refining Ni-base super alloy

来源期刊：中国有色金属学报(英文版)2002年第1期

论文作者：牛建平 孙晓峰 杨克努 郑启 管恒荣 胡壮麒

文章页码：11 - 15

Key words：Ni-base superalloy；VIM (vacuum induction melting)；CaO crucible；denitrogenation； desulphurization

Abstract: The denitrogenation and desulphurization behavior during vacuum induction melting (VIM) refining Ni-base superalloy using CaO crucible was studied. It has been found that the desulphurization process did not occur by only using CaO crucible. Combining with the results of XRD and composition analysis, the desulphurization mechanism of CaO crucib le was proposed. Al addition limits effect on denitrogenation, but it is very important for desulphurization. Ti addition has adverse effect on denitrogenation. The increase of vacuum is a powerful measurement to accelerate the denitrogenat ion process.