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

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Center of Maritime Technologies e.V.

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.

Details

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
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

    Research areas

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

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