Microstructure and fatigue properties of friction stir welded high-strength steel plates

Gonçalo Sorger*, Eero Lehtimäki, Susanna Hurme, Heikki Remes, Pedro Vilaça, Lars Molter

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
248 Downloads (Pure)

Abstract

The weldability of high-strength steels (HSSs) is limited by their loss of strength, toughness and fatigue properties. In demanding applications, the fatigue properties of welds are among the strictest requirements. This paper presents a weldability analysis focusing on the microstructure and fatigue properties of 6 mm thick S690 and S355 HSS plates joined by friction stir welding. Their fatigue properties are compared to design recommendations and to fatigue properties obtained with other welding techniques. Results show that the high-quality friction stir welded steel joints outperform high-quality arc welds and FAT80 design recommendations. The fatigue strength of the friction stir welded joints is increased with material yield strength. The mechanisms governing crack initiation at different maximum stress levels are discussed.

Original languageEnglish
Pages (from-to)380-386
Number of pages7
JournalScience and Technology of Welding and Joining
Volume23
Issue number5
Early online date21 Nov 2017
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • fatigue
  • Friction stir welding
  • high-strength steel
  • microstructure
  • S355
  • S690

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