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Fracture toughness of martensitic stainless steel resistance spot welds

Pouranvari, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2016.10.088
  3. Abstract:
  4. The paper is focused on the strength and fracture toughness of AISI420 martensitic stainless steel resistance spot welds under the tensile-shear loading. The failure behavior of AISI420 spot welds was featured by quasi-cleavage interfacial failure with low load bearing capacity and weak energy absorption capability which was a function of the weld fusion microstructure, predominately carbon and chromium rich martensite plus δ-ferrite. Fracture toughness of the fusion zone proved to be the most important factor controlling the peak load of the spot welds made on AISI420 failed in interfacial mode. A geometry-independent fracture toughness of the weld nugget (c.a. 23 MPam0.5) was determined using fracture mechanics concept. Through modeling it was found that there is a critical fracture toughness which beyond that the pullout failure mode can be obtained which is a function of sheet thickness and tensile strength of the base metal. © 2016 Elsevier B.V
  5. Keywords:
  6. Failure mode ; Carbon ; Failure modes ; Fracture ; Fracture mechanics ; Martensitic stainless steel ; Resistance welding ; Sheet metal ; Spot welding ; Stainless steel ; Tensile strength ; Welds ; Critical fracture toughness ; Energy absorption capability ; Failure behaviors ; Interfacial failures ; Interfacial modes ; Pull-out failure ; Resistance spot weld ; Tensile-shear loadings ; Fracture toughness
  7. Source: Materials Science and Engineering A ; Volume 680 , 2017 , Pages 97-107 ; 09215093 (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/abs/pii/S0921509316313041