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Microstructure and mechanical integrity relationship of PDC weld joints involving dissimilar marine grade alloys
, Pranav N.P, Sai B, D. A, Christin S.V.
Published in Elsevier BV
2020
Volume: 50
   
Pages: 111 - 122
Abstract
The fillers ER80S-Ni3 and ER2553 were deployed to obtain 10 mm thick joints of super-duplex stainless steel (SDSS) and high strength low alloy (HSLA) steel using pulsed direct current (PDC) welding approach. Laths of martensite/bainite with retained austenite were observed in the weld seam microstructure of ER80S-Ni3 joints; whereas austeno-ferrite microstructure was seen in ER2553 joints. Considerable changes in the ferrite percentage was noticed in the fusion region of ER2553 joints. Repeated thermal cycles resulted in austenite reformation and thus a lower ferrite percentage was ascertained in the root pass of ER2553 joints. The tensile ruptures were occurred on the base metal region of HSLA for both the cases. Notch tensile studies demonstrated that the weld seams employing ER80SNi-3 filler imparted better strength and failure occurred in the base metal of HSLA. A decrease of 19 % and 76 % in the impact toughness was observed for ER2553 and ER80S-Ni3 joints when operated in room temperature (RT). The impact toughness of the weld seams was drastically deteriorated while operating at −196 °C, reasoned to the ductile to brittle transition. © 2019 The Society of Manufacturing Engineers
About the journal
JournalData powered by TypesetJournal of Manufacturing Processes
PublisherData powered by TypesetElsevier BV
ISSN1526-6125
Open Access0