The role of addition of Ni on the microstructure and mechanical behaviour of C-Mn weld metals
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 obse...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Portuguese |
| Published: |
Universidade Nove de Julho
2007-01-01
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| Series: | Exacta |
| Online Access: | http://www.redalyc.org/articulo.oa?id=81050119 |
| Summary: | 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. |
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| ISSN: | 1678-5428 1983-9308 |