Impurity Removal and Microstructural Analysis of Inconel 718 Refined by Hydrogen Plasma Arc Melting
Abstract
The high-temperature melting and the removal of gaseous and metallic impurities from Inconel 718 by hydrogen plasma arc melting (HPAM) were investigated. Solid-type Inconel 718 scraps were used as raw material. The concentrations of oxygen, nitrogen, and metallic impurities in the scraps were simultaneously decreased by HPAM. The refined ingot satisfied the recommended criteria for commercial Inconel 718. Following the melting of Inconel 718 by HPAM, the microstructure of the as-cast depended on different parts of the ingots, due to the different cooling rate of each part.
- Publication:
-
Metals and Materials International
- Pub Date:
- July 2021
- DOI:
- 10.1007/s12540-019-00595-7
- Bibcode:
- 2021MMI....27.2360L
- Keywords:
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- Inconel 718;
- HPAM;
- Impurities;
- Laves;
- Cooling rate