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Duplex stainless steel/martensitic steel dissimilar resistance spot welding: Microstructure-properties relationships

Sobhani, S ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.29391/2019.98.023
  3. Publisher: American Welding Society , 2019
  4. Abstract:
  5. This paper addresses the phase transformations and mechanical performance of dissimilar resistance spot welds between 2304 duplex stainless steel (DSS) and 1.2-GPa martensitic (MS) advanced high-strength steel (AHSS). The solidification mode and transformation path of the fusion zone (FZ) were analyzed. The key metallurgical feature of the FZ was the formation of a duplex microstructure consisting of delta ferrite and martensite. The FZ size at the sheet/sheet interface was the critical factor controlling the fraction of pullout failure during the partial thickness-partial pullout mode, the load-bearing capacity, and the energy absorption capability of the DSS/MS dissimilar resistance spot welds. The pairing of DSS and MS sheets reduced the tendency to fail In the interfacial failure mode compared to the similar MS/MS and DSS/DSS joints, which can be attributed to the higher FZ hardness and the higher tendency of the dissimilar joint to rotate during the tensile-shear loading as well as the presence of softening in the heat-affected zone of the martensitic steel side. © 2019 American Welding Society. All rights reserved
  6. Keywords:
  7. Duplex stainless steels (dss) ; Phase transformation ; Duplex stainless steel ; Failure (mechanical) ; Heat affected zone ; High strength steel ; Martensitic transformations ; Mechanical properties ; Microstructure ; Nickel steel ; Phase transitions ; Spot welding ; Dissimilar welding ; Duplex microstructures ; Duplex stainless steel (DSS) ; Energy absorption capability ; Martensitic (ms) advanced high-strength steels (ahsss) ; Mechanical performance ; Microstructure properties ; Resistance spot welding ; Advanced high strength Steel
  8. Source: Welding Journal ; Volume 98, Issue 9 , 2019 , Pages 263S-272S ; 00432296 (ISSN)