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Ferritic-austenitic stainless steels dissimilar resistance spot welds: Metallurgical and failure characteristics

Pouranvari, M ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1080/13621718.2015.1124491
  3. Publisher: Taylor and Francis Ltd , 2016
  4. Abstract:
  5. The paper addresses the microstructure and failure characteristics of dissimilar resistance spot welds between austenitic stainless steel and ferritic stainless steel. The fusion zone (FZ) of dissimilar welds exhibited complex microstructure consisting of ferrite, austenite and martensite. The development of this triplex structure in the FZ was explained by analysing the phase transformation path and austenite stability. Results showed that all dissimilar welds failed in partial thickness-partial pull-out failure mode. It was shown that the fraction of the nugget fracture of the weld is reduced by increasing the FZ size improving the mechanical performance of the weld. Peak load and energy absorption of the similar and dissimilar welds were compared and analysed. © 2016 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the Institute
  6. Keywords:
  7. Failure mode ; Ferritic stainless steel ; Phase transformation ; Resistance spot welding ; Austenite ; Austenitic stainless steel ; Austenitic transformations ; Failure modes ; Ferrite ; Ferritic steel ; Fracture ; Microstructure ; Phase transitions ; Resistance welding ; Spot welding ; Steel metallurgy ; Welding ; Welds ; Austenite stability ; Complex microstructures ; Dissimilar welding ; Failure characteristics ; Mechanical performance ; Resistance spot weld ; Stainless steel
  8. Source: Science and Technology of Welding and Joining ; Volume 21, Issue 6 , 2016 , Pages 438-445 ; 13621718 (ISSN)
  9. URL: http://www.tandfonline.com/doi/full/10.1080/13621718.2015.1124491