Investigation on Denitrogenation Technology and Mechanism during VIM Refining Ni-Base Superalloy
The denitrogenation technology and mechanism of a new kind of Ni-base superalloy during vacuum induction melting (VIM) were studied. The nitrogen content could be reduced from 0.0005% to 0.0002% by this technology. The calculated interaction coefficient of Ti with N () is about -0.38, and the activity coefficient of N () is 0.714. The denitrogenation mechanism was discussed through the calculation of the reaction ratio constants and .
Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu
J. P. Niu and Z. Q. Hu, "Investigation on Denitrogenation Technology and Mechanism during VIM Refining Ni-Base Superalloy", Advanced Materials Research, Vols. 284-286, pp. 2433-2436, 2011