Effect of TiO2 Content of the Slag of Electro Slag Remelting Process on Chemical Composition, Microstructure and Mechanical properties of Recycled IN713LC

Recycling of industrial scrap of IN317LC superalloys via ESR process is investigated in this article. The purpose of this study is reach to the best chemical composition, microstructure and mechanical properties according to AMS5377E standard. Different levels of TiO2 (0, 3, 6 wt %) were added to 70CaF2-30Al2O3 ESR slag. The results show that in slag wih 3 wt % TiO2, Ti loss compensate by Oxidation-Reduction reaction between slag and melt. As a result of the variation of slag activity, oxygen and nitrogen of the recycled ingot reach to 14.3 and 16 ppm, respectively. In addition, this ingot has the maximum level of γ' particle with minimum size because of high level of (Ti) of this recycled alloy, the good microstructure and the stress rupture life of 47 hr obtained. In the recycled ingot by 6 wt % TiO2, despite of compensation of Ti loss and increase of Ti level, the mechanical properties reduced as a result of reduction of γ' volume fraction.