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

Simple item page
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.accessioned2020-03-26T03:46:07Zen_AU
dc.date.available2020-03-26T03:46:07Zen_AU
dc.date.issued2015-07-01en_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. © 2015 Elsevier Inc.en_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. Materials Characterization, 105, 118-128. doi:10.1016/j.matchar.2015.05.001en_AU
dc.identifier.govdoc9063en_AU
dc.identifier.issn1044-5803en_AU
dc.identifier.journaltitleMaterials Characterizationen_AU
dc.identifier.pagination118-128en_AU
dc.identifier.urihttps://doi.org/10.1016/j.matchar.2015.05.001en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9253en_AU
dc.identifier.volume105en_AU
dc.language.isoenen_AU
dc.publisherElsevier B.V.en_AU
dc.subjectNickel base alloysen_AU
dc.subjectWeldingen_AU
dc.subjectCarbidesen_AU
dc.subjectLamellaeen_AU
dc.subjectHastelloy Nen_AU
dc.subjectChemistryen_AU
dc.subjectCrystal structureen_AU
dc.titleCharacterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by weldingen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles