The effect of heat input on the microstructure and mechanical properties of dissimilar welds of direct-quenched ultrahigh strength steel (Optim 960 QC) and duplex stainless steel (UNS S32205) was studied. The effect of heat input on grain coarsening and the proportion of bainite-martensite on the ferritic side and ferrite-austenite on the duplex side was clearly evident. The hardness profile showed a trend of increasing hardness with lower heat input. Enhancement in tensile strength corresponded to lower heat input and increase in hardness. The elongation values and bend behavior were roughly the same for all the specimens; there was no clear link to the heat input. Moderate heat input gave optimum impact toughness in the weld and the ferritic HAZ. The fatigue performance of the specimens demonstrated the profound influence of geometrical effects. However, the effect of microstructural characteristics on fracture location was also observed.
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ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
June 25–30, 2017
Trondheim, Norway
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5768-7
PROCEEDINGS PAPER
Effect of GMAW Heat Input on the Microstructure and Mechanical and Fatigue Behavior of Dissimilar Welds of Ultrahigh Strength Steel and Duplex Stainless Steel
Hamed Tasalloti Kashani,
Hamed Tasalloti Kashani
Lappeenranta University of Technology, Lappeenranta, Finland
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Mohammad Dabiri,
Mohammad Dabiri
Lappeenranta University of Technology, Lappeenranta, Finland
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Paul Kah,
Paul Kah
Lappeenranta University of Technology, Lappeenranta, Finland
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Jukka Martikainen
Jukka Martikainen
Lappeenranta University of Technology, Lappeenranta, Finland
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Hamed Tasalloti Kashani
Lappeenranta University of Technology, Lappeenranta, Finland
Mohammad Dabiri
Lappeenranta University of Technology, Lappeenranta, Finland
Paul Kah
Lappeenranta University of Technology, Lappeenranta, Finland
Jukka Martikainen
Lappeenranta University of Technology, Lappeenranta, Finland
Paper No:
OMAE2017-62646, V004T03A033; 14 pages
Published Online:
September 25, 2017
Citation
Tasalloti Kashani, H, Dabiri, M, Kah, P, & Martikainen, J. "Effect of GMAW Heat Input on the Microstructure and Mechanical and Fatigue Behavior of Dissimilar Welds of Ultrahigh Strength Steel and Duplex Stainless Steel." Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. Volume 4: Materials Technology. Trondheim, Norway. June 25–30, 2017. V004T03A033. ASME. https://doi.org/10.1115/OMAE2017-62646
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