Characterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by welding

dc.contributor.authorBhattacharyya, Den_AU
dc.contributor.authorDavis, Jen_AU
dc.contributor.authorDrew, Men_AU
dc.contributor.authorHarrison, RPen_AU
dc.contributor.authorEdwards, Len_AU
dc.date.accessioned2023-01-27T01:34:32Zen_AU
dc.date.available2023-01-27T01:34:32Zen_AU
dc.date.issued2015-02-09en_AU
dc.description.abstractNickel based alloys of the type Hastelloy-N™ are ideal candidate materials for molten salt reactors, as well as for applications such as pressure vessels, due to their excellent resistance to creep, oxidation and corrosion. In this work, the authors have attempted to understand the effects of welding on the morphology, chemistry and crystal structure of the precipitates in the heat affected zone (HAZ) and the weld zone of a Ni–Cr–Mo–Fe–Si alloy similar to Hastelloy-N™ in composition, by using characterization techniques such as scanning and transmission electron microscopy. Two plates of a Ni–Cr–Mo–Fe–Si alloy GH-3535 were welded together using a TiG welding process without filler material to achieve a joint with a curved molten zone with dendritic structure. It is evident that the primary precipitates have melted in the HAZ and re-solidified in a eutectic-like morphology, with a chemistry and crystal structure only slightly different from the pre-existing precipitates, while the surrounding matrix grains remained unmelted, except for the zones immediately adjacent to the precipitates. In the molten zone, the primary precipitates were fully melted and dissolved in the matrix, and there was enrichment of Mo and Si in the dendrite boundaries after solidification, and re-precipitation of the complex carbides/silicides at some grain boundaries and triple points. The nature of the precipitates in the molten zone varied according to the local chemical composition. - Graphical abstract: Display Omitted - Highlights: • Ni-based alloy with Cr, Mo, Si, Fe and C was welded, examined with SEM, EBSD, and TEM. • Original Ni{sub 2}(Mo,Cr){sub 4}(Si,C) carbides changed from equiaxed to lamellar shape in HAZ. • Composition and crystal structure remained almost unchanged in HAZ. • Original carbides changed to lamellar Ni{sub 3}(Mo,Cr){sub 3}(Si,C) in some cases in weld metal. • Precipitates were mostly incoherent, but semi-coherent in some cases in weld metal.en_AU
dc.identifier.booktitleAMAS XIII : the 13th Biennial Australian Microbeam Analysis Symposium : program and abstractsen_AU
dc.identifier.citationBhattacharyya, D., Davis, J., Drew, M., Harrison, R. P., & Edwards, L. (2015). Characterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by welding. Paper presented at AMAS XIII : the 13th Biennial Australian Microbeam Analysis Symposium, University of Tasmania, Hobart, 9-13 February, 2015. In Goemann, K., Danyushevsky, L. & Thompson, J. (Eds), AMAS XIII : the 13th Biennial Australian Microbeam Analysis Symposium : program and abstracts, (pp.118-119). en_AU
dc.identifier.conferenceenddate13 February 2015en_AU
dc.identifier.conferencenameAMAS XIII : the 13th Biennial Australian Microbeam Analysis Symposiumen_AU
dc.identifier.conferenceplaceHobart, Australiaen_AU
dc.identifier.conferencestartdate9 February 2015en_AU
dc.identifier.editorsGoemann, K., Danyushevsky, L. & Thompsonen_AU
dc.identifier.isbn978-09580408-5-3en_AU
dc.identifier.pagination118-119en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14553en_AU
dc.language.isoenen_AU
dc.publisherMaterials Australian and The Australian Ceramic Societyen_AU
dc.subjectCarbidesen_AU
dc.subjectSilicidesen_AU
dc.subjectNickelen_AU
dc.subjectAlloysen_AU
dc.subjectChromiumen_AU
dc.subjectMolybdenumen_AU
dc.subjectIronen_AU
dc.subjectSiliconen_AU
dc.subjectWeldingen_AU
dc.subjectMolten saltsen_AU
dc.titleCharacterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by weldingen_AU
dc.typeConference Abstracten_AU
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