In:
Exacta, University Nove de Julho, Vol. 5, No. 1 ( 2008-07-03)
Abstract:
The aim in this work is to study the influence of nickel content (as-welded state and after stress relief heat treatment) on the microstructure and toughness of CMn weld metals obtained with submerged arc welding. The nickel content vary between 0.50 wt.% and 3.11 wt.%. The microstructures were observed using optical microscopy (OM) and scanning electron microscopy (SEM). The toughness was evaluated by Charpy-V impact testing in samples cut transversally to the weld bead. The impact energy showed that nickel content up to 1 wt.% improves the toughness due to the increase of the acicular ferrite (AF) content and microstructural refinement. On the other hand, higher nickel contents have a deleterious effect on the toughness due to the presence of the microconstituent martensite-austenite (M-A) in the weld metal. The stress relief heat treatment did not improve too much the weld metal toughness, even the M-A suffering decomposition (ferrite+carbide). This may be explained by the precipitation of carbides along the boundaries of the ferrite.
Type of Medium:
Online Resource
ISSN:
1983-9308
,
1678-5428
DOI:
10.5585/exacta.v5i1.1037
Language:
Unknown
Publisher:
University Nove de Julho
Publication Date:
2008
detail.hit.zdb_id:
2646775-6
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