fissuration à chaud et progrès récents en soudabilité des alliages de nickel, type Inconel 718 et Waspaloy

Boucher, Christian; Varela, D.W.; Dadian, M.; Granjon, H

doi:10.1051/metal/197673120817

Cited by 14 publications

(3 citation statements)

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“…Still, this agrees with earlier observations about a beneficial influence of δ phase associated with a backfilling mechanism and grain boundary pinning 12 12,14 Boucher et al also found that δ phase improved the resistance to HAZ liquation cracking through a solute blocking mechanism of Nb 15. Others have claimed that the δ phase will increase the susceptibility to cracking through liquation and embrittlement of the grain boundaries at elevated temperatures 16…”

Section: Discussionsupporting

confidence: 88%

“…12,14 Boucher et al also found that d phase improved the resistance to HAZ liquation cracking through a solute blocking mechanism of Nb. 15 Others have claimed that the d phase will increase the susceptibility to cracking through liquation and embrittlement of the grain boundaries at elevated temperatures. 16,17 Both Alloy 718 and Allvac 718Plus contain NbC carbides, which form a low melting carbide eutectic at y1250uC at the grain boundaries.…”

Section: Discussion Haz Crackingmentioning

confidence: 99%

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Repair welding of wrought superalloys: Alloy 718, Allvac 718Plus and Waspaloy

Andersson

Sjöberg

2012

Science and Technology of Welding and Joining

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The ability to weld repair three precipitation hardening superalloys, i.e. Alloy 718, Allvac 718Plus and Waspaloy, with gas tungsten arc welding, is compared in this study. Four different solution heat treatment conditions for each material were examined: Alloy 718 and Allvac 718Plus heat treated at 954uC-1 h, 982uC-1 h, 954uC-15 h and 1020uC-1 h and Waspaloy for 4 h at 996uC, 1010uC, 1040uC and at 1080uC. By metallography, the total number of cracks was evaluated in both the heat affected zone and the fusion zone, which made it possible to consistently rate the repair weldability of these three materials. Alloy 718 was significantly the best one, with Allvac 718Plus slightly better than Waspaloy. As expected, the solution heat treatment conditions only affected the heat affected zone cracking behaviour.

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Section: Discussionsupporting

confidence: 88%

Section: Discussion Haz Crackingmentioning

confidence: 99%

Repair welding of wrought superalloys: Alloy 718, Allvac 718Plus and Waspaloy

Andersson

Sjöberg

2012

Science and Technology of Welding and Joining

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“…The role of the d phase in the grain boundary liquation is ambiguous. Some researchers claim that the presence of d phase will lower the susceptibility to grain boundary liquation, 8 while others claim that it will increase the susceptibility due to the high Nb content of the d phase (nominal composition Ni 3 Nb). 5,9 An interaction with the d phase to enhance the constitutional liquation of MC carbides is quite possible.…”

Section: Introductionmentioning

confidence: 99%

Effect of different solution heattreatments on hot ductility of superalloysPart 2 – Allvac 718Plus

Andersson

Sjöberg

Viskari

et al. 2012

Materials Science and Technology

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The hot ductility of Allvac 718Plus for different solution heat treatments (954°C–15 h, 954°C–1 h, 982°C–1 h and 1050°C–3 h+954°C–1 h) has been investigated using Gleeble testing. Substantial variations in the microstructure among the heat treatments affected the Gleeble test hot ductility only to a very limited extent. Constitutional liquation of the NbC phase was found to be the main cause for the poor ductility at high testing temperatures in the on-heating cycle as well as at the lower temperatures on-cooling. Grain boundary δ phase was seen to assist the constitutional liquation of the NbC phase. Based on established evaluation criteria for Gleeble ductility testing, a ranked indicator for weldability is suggested.

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