Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned Materials

The nitrogen behavior of superalloy melt GH4169 during the vacuum induction melting (VIM) process was clarified by using different proportions returned materials including block-shaped material, chip-shaped and pure to produce a high–purity provide guidance for purification melt. For removal VIM process, denitrification rate in refining period reached 10 ppm per hour on average, which is significantly higher than 1 average period. reaction under extremely low pressure controlled both mass transfer chemical liquid–gas interface. melts occurs through two methods gasification nitride floatation because nitrides begin precipitate liquid phase at 1550 °C. A can be obtained increasing proportion material or decreasing material.