Abstract
Multipass GMAW (Gas Metal Arc Welding) welding was used to join X80 linepipe materials using two weld metals of slightly different compositions. Welding wires with diameters of 0.984 and 0.909 mm were used while applying the same heat input in each pass. The slight difference in the wire diameters resulted in different HAZ microstructures. The microstructures in the doubly reheated HAZ of both welds were found to contain bainite-ferrite. However, etching also revealed a difference in martensite-austenite (MA) fraction in these reheated zones. The MA exhibited twice the hardness of ferrite when measured by nanoindentation. Tensile testing from the reheated zone of both welds revealed a difference in yield strength, tensile strength and elongation of the transverse weld specimens. In the reheated zone of weld A, (produced with a 0.984 mm wire) a higher fraction of MA was observed, which resulted in higher strength but lower elongation compared to weld B. The ductility of weld A was found severely impaired (to nearly half of weld B) due to formation of closely spaced voids around the MA, along with debonding of MA from the matrix, which occurs just above the yield stress.
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Acknowledgments
The authors wish to acknowledge the Natural Science and Engineering Research Council (NSERC) of Canada for financial support. Further financial support, and the X80 material was provided by TransCanada Pipelines. The authors are grateful to Dr. Yuquan Ding, University of Waterloo for his help in performing nano indentation. The transmission electron microscopy research described in this paper was performed at the Canadian Centre for Electron Microscopy at McMaster University, which is supported by NSERC and other government agencies.
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Manuscript submitted January 18, 2017.
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Huda, N., Lazor, R. & Gerlich, A.P. Study of MA Effect on Yield Strength and Ductility of X80 Linepipe Steels Weld. Metall Mater Trans A 48, 4166–4179 (2017). https://doi.org/10.1007/s11661-017-4171-1
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DOI: https://doi.org/10.1007/s11661-017-4171-1