Post-weld heat treatment of API 5L X70 high strength low alloy steel welds

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dc.contributor.authorAlipooramirabad, Hen_AU
dc.contributor.authorParadowska, AMen_AU
dc.contributor.authorNafisi, Sen_AU
dc.contributor.authorReid, Men_AU
dc.contributor.authorGhomashchi, Ren_AU
dc.date.accessioned2021-02-12T04:53:05Zen_AU
dc.date.available2021-02-12T04:53:05Zen_AU
dc.date.issued2020-12-18en_AU
dc.date.statistics2021-02-11en_AU
dc.description.abstractHigh Strength Low Alloy (HSLA) steels are the materials of choice in pipeline construction with the API X70 grade as the steel for the majority of pipeline networks constructed during the late 20th and early this century. This paper reports on the influence of Post-Weld Heat Treatment (PWHT) on the reduction of residual stresses, resulting changes in the microstructure, and mechanical properties of a multi-pass, X70 HSLA steel, weld joints made by a combined Modified Short Arc Welding (MSAW) and Flux Cored Arc Welding (FCAW) processes. Neutron diffraction results highlighted high magnitude of tensile residual stresses, in excess of yield strength of both parent and weld metal, in the as-welded specimen (~650 MPa), which were decreased substantially as a result of applying PWHT (~144 MPa). Detailed microstructural studies are reported to confirm the phase transformation during PWHT and its interrelationship with mechanical properties. Transmission Electron Microscopy (TEM) analysis showed polygonization and formation of sub-grains in the PWHT specimen which justifies the reduction of residual stress in the heat-treated weld joints. Furthermore, microstructural changes due to PWHT justify the improvement in ductility (increase in the elongations) with a slight reduction in yield and tensile strength for the PWHT weld joint. © 1996-2021 MDPIen_AU
dc.identifier.citationAlipooramirabad, H., Paradowska, A., Nafisi, S., Reid, M., & Ghomashchi, R. (2020). Post-weld heat treatment of API 5L X70 high strength low alloy steel welds. Welding and Joining Processes of Materials, 3(24): 5801. doi:10.3390/ma13245801en_AU
dc.identifier.issn1996-1944en_AU
dc.identifier.issue24en_AU
dc.identifier.journaltitleWelding and Joining Processes of Materialsen_AU
dc.identifier.pagination5801en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10392en_AU
dc.identifier.volume3en_AU
dc.language.isoenen_AU
dc.publisherMDPIen_AU
dc.subjectAlloysen_AU
dc.subjectSteelsen_AU
dc.subjectHeat treatmentsen_AU
dc.subjectArc weldingen_AU
dc.subjectPhase transformationsen_AU
dc.subjectTransmission electron microscopyen_AU
dc.subjectMicrostructureen_AU
dc.subjectYield strengthen_AU
dc.subjectTensile propertiesen_AU
dc.titlePost-weld heat treatment of API 5L X70 high strength low alloy steel weldsen_AU
dc.typeJournal Articleen_AU
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