Welding of IN792 DS Superalloy by High Energy Density Techniques

Abstract:

Laser (LBW) and Electron Beam (EBW) welding have been used to produce seams on 2 mm thick plates of directionally solidified (DS) IN792 superalloy. For each welding technique a grid of samples were prepared by varying the pass speed (v) and keeping constant the other process parameters. The experiments were carried out at room temperature and with pre-heating (PHT) at 200 °C and 300 °C to find the best process conditions. The microstructural changes in molten zone (MZ) and heat affected zone (HAZ) were investigated finding that EBW guarantee a better quality and efficiency of the process without any macro defects. About the microstructure, the amount of ordered γ’ phase in the MZ is similar (≈ 25 %) for both welding techniques and quite lower than the value (70 %) of the original alloy.

• Periodical: Materials Science Forum (Volume 884)
• Pages: 166-177
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.884.166
• Online since: January 2017
• Authors: Giuliano Angella, Giuseppe Barbieri*, Riccardo Donnini, Roberto Montanari, Alessandra Varone
• Keywords: Electron Beam, Laser, Microstructure, Superalloy, Welding

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