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A pathway to produce strong and tough martensitic stainless steels resistance spot welds

Aghajani, H ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1080/13621718.2018.1483065
  3. Publisher: Taylor and Francis Ltd , 2019
  4. Abstract:
  5. Martensitic stainless steel (MSS) resistance spot welds are prone to quasi-cleavage interfacial failure with very low energy absorption capability due to formation of hard and brittle carbon and chromium rich martensite in the fusion zone (FZ). In this work, a new pathway is proposed to enhance strength/toughness of the MSS resistance spot welds based on modification of the FZ composition/microstructure via introducing a nickel interlayer. This altered the FZ microstructure from dual phase microstructure of martensite and δ-ferrite to austenitic microstructure with finely dispersed ultra-fine chromium rich carbides. Formation of a tough predominately austenitic microstructure in the FZ enabled achieving a pullout failure with an unprecedented level of energy absorption. © 2018, © 2018 Institute of Materials, Minerals and Mining. Published by Taylor & Francis on behalf of the Institute
  6. Keywords:
  7. Martensitic stainless steel ; Austenite ; Carbides ; Chromium compounds ; Energy absorption ; Failure (mechanical) ; Martensite ; Microstructure ; Satellites ; Spot welding ; Welds ; Austenitic microstructure ; Dual phase microstructure ; Interfacial failures ; Nickel interlayer ; Pull-out failure ; Quasi-cleavage ; Resistance spot weld ; Resistance spot welding
  8. Source: Science and Technology of Welding and Joining ; Volume 24, Issue 3 , 2019 , Pages 185-192 ; 13621718 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/13621718.2018.1483065