Improvement of the Fatigue Resistance of Super Duplex Stainless-Steel (SDSS) Components Fabricated by Wire Arc Additive Manufacturing (WAAM)

Andrew Sales, Andrei Kotousov, Egon Perilli, Ling Yin

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Abstract

This study aimed to improve the overall fatigue properties of WAAM-produced SDSS by changing the interpass temperatures. Micro-computed tomography was used to quantitatively characterise the internal defects, such as porosity, in large-volume WAAM-fabricated SDSS materials. An increase in the interpass temperature led to a reduction in the ferrite phase balance by up to 20%. The fatigue anisotropy was still evident, but the fatigue limit in the weakest (transverse) direction was increased to 250 MPa or by approximately 40%. Meanwhile, the increased interpass temperature had no significant effect on fatigue resistance in the longitudinal direction. This study suggests that the interpass temperature can be critical for both achieving isotropic mechanical properties and increasing fatigue life of structural components fabricated with the WAAM method.

Original languageEnglish
Article number1548
Number of pages12
JournalMetals
Volume12
Issue number9
Early online date19 Sep 2022
DOIs
Publication statusPublished - Sep 2022

Keywords

  • design
  • fatigue
  • super duplex stainless steels
  • wire arc additive manufacturing (WAAM)

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