Phase structures and morphologies of tempered CA6NM stainless steel welded by hybrid laser-arc process

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DOIResolve DOI: http://doi.org/10.1016/j.matchar.2016.10.029
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TypeArticle
Journal titleMaterials Characterization
ISSN1044-5803
Subjectmartensitic stainless steel; welding; post-weld heat treatment; tempering; microstructure; EBSD
AbstractThe post-weld tempered microstructure of hybrid laser-arc welded CA6NM, a cast low carbon martensitic stainless steel, was investigated. The microstructural evolutions from the fusion zone to the base metal were characterized in detail using optical microscopy, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and microhardness techniques. The fusion zone, in its post-weld tempered condition, consisted of tempered lath martensite, residual delta-ferrite with various morphologies, reversed austenite and chromium carbides. The reversed austenite, which can be detected through both EBSD and XRD techniques, was found to be finely dispersed along the martensite lath boundaries, particularly at triple junctions. Based on the EBSD analysis, the orientation relationship between the reversed austenite and the adjacent martensite laths seemed to follow the Kurdjumov-Sachs (K-S) model. The results also revealed the presence of the reversed austenite in the different regions of the heat affected zone after post-weld tempering. The microindentation hardness distribution was measured, and correlated to the evolution of the corresponding microstructure across the welds.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
IdentifierS1044580316307525
NPARC number23000920
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Record identifier556ce016-bb09-4086-97f0-e3105b3c6522
Record created2016-11-15
Record modified2016-11-15
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