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Synchrotron diffraction analysis of retained austenite in welded transformation induced plasticity (TRIP) steels

Amirthalingam, M.; Hermans, M. J. M.; Huizenga, R. M.; Offerman, S. E.; Richardson, I. M. and Gundlach, Carsten LU (2012) In Science and Technology of Welding and Joining 17(2). p.146-154
Abstract
A quantitative analysis of the retained austenite (RA) fractions in gas tungsten arc welded silicon and aluminium containing transformation induced plasticity steels was carried out by synchrotron X-ray diffraction measurements. The variation in RA transverse to the weld line was measured to study the effect of weld thermal cycles on the stabilisation of austenite in the heat affected zone (HAZ) and the fusion zone (FZ). The results showed that the FZ of silicon based steels contained a higher amount of RA (similar to 7%) than aluminium based steels, which contained only similar to 4%. During the solidification of the weld pool, aluminium was found to partition to solidifying delta-ferrite and to stabilise the soft delta-ferrite grains at... (More)
A quantitative analysis of the retained austenite (RA) fractions in gas tungsten arc welded silicon and aluminium containing transformation induced plasticity steels was carried out by synchrotron X-ray diffraction measurements. The variation in RA transverse to the weld line was measured to study the effect of weld thermal cycles on the stabilisation of austenite in the heat affected zone (HAZ) and the fusion zone (FZ). The results showed that the FZ of silicon based steels contained a higher amount of RA (similar to 7%) than aluminium based steels, which contained only similar to 4%. During the solidification of the weld pool, aluminium was found to partition to solidifying delta-ferrite and to stabilise the soft delta-ferrite grains at the fusion boundaries. Owing to this partitioning, the HAZ was enriched in carbon and the RA content was found to increase with distance from the fusion boundaries. In contrast, this partitioning behaviour was not present in silicon based transformation induced plasticity steels and a lesser amount of RA was found in the coarse grained HAZ than in the FZ. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
TRIP steels, Retained austenite, Synchrotron diffraction, GTA welding
in
Science and Technology of Welding and Joining
volume
17
issue
2
pages
146 - 154
publisher
Maney Publishing
external identifiers
  • wos:000299425300011
  • scopus:84856069478
ISSN
1362-1718
DOI
10.1179/1362171811Y.0000000090
language
English
LU publication?
yes
id
836c131e-d84e-4f20-902f-e584d40119a5 (old id 2348834)
date added to LUP
2012-02-24 09:55:41
date last changed
2017-01-01 03:32:12
@article{836c131e-d84e-4f20-902f-e584d40119a5,
  abstract     = {A quantitative analysis of the retained austenite (RA) fractions in gas tungsten arc welded silicon and aluminium containing transformation induced plasticity steels was carried out by synchrotron X-ray diffraction measurements. The variation in RA transverse to the weld line was measured to study the effect of weld thermal cycles on the stabilisation of austenite in the heat affected zone (HAZ) and the fusion zone (FZ). The results showed that the FZ of silicon based steels contained a higher amount of RA (similar to 7%) than aluminium based steels, which contained only similar to 4%. During the solidification of the weld pool, aluminium was found to partition to solidifying delta-ferrite and to stabilise the soft delta-ferrite grains at the fusion boundaries. Owing to this partitioning, the HAZ was enriched in carbon and the RA content was found to increase with distance from the fusion boundaries. In contrast, this partitioning behaviour was not present in silicon based transformation induced plasticity steels and a lesser amount of RA was found in the coarse grained HAZ than in the FZ.},
  author       = {Amirthalingam, M. and Hermans, M. J. M. and Huizenga, R. M. and Offerman, S. E. and Richardson, I. M. and Gundlach, Carsten},
  issn         = {1362-1718},
  keyword      = {TRIP steels,Retained austenite,Synchrotron diffraction,GTA welding},
  language     = {eng},
  number       = {2},
  pages        = {146--154},
  publisher    = {Maney Publishing},
  series       = {Science and Technology of Welding and Joining},
  title        = {Synchrotron diffraction analysis of retained austenite in welded transformation induced plasticity (TRIP) steels},
  url          = {http://dx.doi.org/10.1179/1362171811Y.0000000090},
  volume       = {17},
  year         = {2012},
}