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Superalloy IN792 DS: Optimization of electron beam and laser welding and post-welding treatments [Superlega IN792 DS: Ottimizzazione della saldatura EB e laser e dei trattamenti post saldatura]

TitleSuperalloy IN792 DS: Optimization of electron beam and laser welding and post-welding treatments [Superlega IN792 DS: Ottimizzazione della saldatura EB e laser e dei trattamenti post saldatura]
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2018
AuthorsBarbieri, Giuseppe, Cognini Francesco, Moncada M., and Testani C.
JournalRivista Italiana della Saldatura
Volume70
Pagination173-182
ISSN00356794
KeywordsCracks, Directionally solidified, Disordered matrices, Electron beam welding, Electron beams, Heat treatment, High temperature, High temperature components, High temperature effects, Intermetallic phase, Laser beam welding, Laser beams, Nickel alloys, Nickel- based superalloys, Post weld heat treatment, Repair, Service operations, Superalloys, Welds
Abstract

Nickel-based superalloys are widely used in the fabrication of high temperature components (discs and vanes) of aeronautical turbines and power plants. Their structure consists, quite simply, of two phases: a disordered matrix (phase ã) reinforced by a second ordered intermetallic phase precipitation, i.e: Ni3 (Al, Ti) phase ã'. In service operation, the nickel superalloy mechanical parts are subject to surface cracking. Given the high cost production, their repair by welding/remelting with material adduction can be a valid solution for the life extension of the components. This paper presents the results of electron beam and laser beam repair welding optimization through re-melting tests analysis conducted on 2 mm thick plates obtained from a directionally solidified IN792 ingot (DS). The results show how, both with EBW and LBW, a preheating (PHT) at 300 °C is necessary to avoid hot cracking initiation followed by a subsequent post-weld heat treatment (PWHT) for stress relieving. For both techniques, the microstructure shows how the ratio between ã'/ã phases goes from 70/30 of the base material to 30/70 of the fused zone (ZF). It has been possible to realize crack-free remelting, however the laser technique (LBW) remains more susceptible to the porosity compared to the electron beam welding (EBW). © 2018 Instituto Italiano della Saldatura. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85051181153&partnerID=40&md5=3394f9a6191a042de16fb48e6f3455af
Citation KeyBarbieri2018173