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

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

doi:10.1080/13621718.2017.1399574

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

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

^*Tämän työn vastaava kirjoittaja

Energia- ja konetekniikan laitos

Center of Maritime Technologies e.V. (CMT)

Tutkimustuotos: Lehtiartikkeli › Article › Scientific › vertaisarvioitu

26 Sitaatiot (Scopus)

395 Lataukset (Pure)

Abstrakti

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.

Alkuperäiskieli	Englanti
Sivut	380-386
Sivumäärä	7
Julkaisu	Science and Technology of Welding and Joining
Vuosikerta	23
Numero	5
Varhainen verkossa julkaisun päivämäärä	21 marrask. 2017
DOI - pysyväislinkit	https://doi.org/10.1080/13621718.2017.1399574
Tila	Julkaistu - 2018
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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10.1080/13621718.2017.1399574Lisenssi: CC BY-NC-ND

Sorger_etal_STWJ_2017
Copyright 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.
Final published version, 1,73 MBLisenssi: CC BY-NC-ND

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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.",

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author = "Gon{\c c}alo Sorger and Eero Lehtim{\"a}ki and Susanna Hurme and Heikki Remes and Pedro Vila{\c c}a and Lars Molter",

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AU - Sorger, Gonçalo

AU - Lehtimäki, Eero

AU - Hurme, Susanna

AU - Remes, Heikki

AU - Vilaça, Pedro

AU - Molter, Lars

PY - 2018

Y1 - 2018

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AB - 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.

KW - fatigue

KW - Friction stir welding

KW - high-strength steel

KW - microstructure

KW - S355

KW - S690

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JO - Science and Technology of Welding and Joining

JF - Science and Technology of Welding and Joining

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

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