Three-pass gas tungsten arc welding in a 20-mm thick SA508 steel plate is modelled using a sequentially coupled thermal-metallurgical-mechanical model. The dilution for each pass is estimated as the proportion of base material in the weld metal, based on an analysis of the cross-sectional area of each fusion zone. The thermal solution of the weld model is validated using thermocouple measurement data and cross-weld macrographs. The predicted microstructure is qualitatively compared with that observed in cross-weld optical micrographs. The measured hardness distribution is used to quantitatively validate the post-weld ferritic phase distribution (e.g. the ferrite, bainite and martensite fractions), based on a hardness-microstructure correlation. The predicted residual stresses are compared with those measured by neutron diffraction. The results show that dilution significantly influences the metallurgical and mechanical properties of weld metal (either as-deposited or reheated), and its consideration notably improves microstructure and residual stress predictions for a multi-pass steel weldment. For the weldment considered, an increase in dilution promotes the formation of martensite, enhances the hardness and leads to lower tensile stresses (or higher compressive stresses) in the weld metal. Such behaviour arises due to the higher hardenability of the base material, coupled with delayed austenite decomposition on cooling.
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ASME 2018 Pressure Vessels and Piping Conference
July 15–20, 2018
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5167-8
PROCEEDINGS PAPER
Modelling of Dilution Effects on Microstructure and Residual Stress in a Multi-Pass Weldment Available to Purchase
Yongle Sun,
Yongle Sun
University of Manchester, Manchester, UK
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C. J. Hamelin,
C. J. Hamelin
Australian Nuclear Science and Technology Organisation, Lucas Heights, Australia
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M. C. Smith,
M. C. Smith
University of Manchester, Manchester, UK
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A. N. Vasileiou,
A. N. Vasileiou
University of Manchester, Manchester, UK
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T. F. Flint,
T. F. Flint
University of Manchester, Manchester, UK
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J. A. Francis
J. A. Francis
University of Manchester, Manchester, UK
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Yongle Sun
University of Manchester, Manchester, UK
C. J. Hamelin
Australian Nuclear Science and Technology Organisation, Lucas Heights, Australia
M. C. Smith
University of Manchester, Manchester, UK
A. N. Vasileiou
University of Manchester, Manchester, UK
T. F. Flint
University of Manchester, Manchester, UK
J. A. Francis
University of Manchester, Manchester, UK
Paper No:
PVP2018-85110, V06AT06A064; 12 pages
Published Online:
October 26, 2018
Citation
Sun, Y, Hamelin, CJ, Smith, MC, Vasileiou, AN, Flint, TF, & Francis, JA. "Modelling of Dilution Effects on Microstructure and Residual Stress in a Multi-Pass Weldment." Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. Volume 6A: Materials and Fabrication. Prague, Czech Republic. July 15–20, 2018. V06AT06A064. ASME. https://doi.org/10.1115/PVP2018-85110
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