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Welding of IN792 DS superalloy by high energy density techniques

TitleWelding of IN792 DS superalloy by high energy density techniques
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2017
AuthorsAngella, G., Barbieri Giuseppe, Donnini R., Montanari R., and Varone A.
JournalMaterials Science Forum
KeywordsDirectionally solidified, Electron beams, Heat affected zone, High energy densities, Lasers, Macrodefects, Microstructural changes, Microstructure, Molten zones, Process condition, Process parameters, Superalloys, Thick plate, Welding

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. © 2017 Trans Tech Publications, Switzerland.


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Citation KeyAngella2017166