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Fatigue properties of laser and hybrid laser-TIG welds of thermo-mechanically rolled steels
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SYSNO ASEP 0518867 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fatigue properties of laser and hybrid laser-TIG welds of thermo-mechanically rolled steels Author(s) Šebestová, Hana (UPT-D) RID, ORCID, SAI
Horník, Petr (UPT-D) RID, ORCID, SAI
Mrňa, Libor (UPT-D) RID, ORCID, SAI
Jambor, M. (SK)
Horník, Vít (UFM-A)
Pokorný, Pavel (UFM-A) ORCID
Hutař, Pavel (UFM-A) RID, ORCID
Ambrož, Ondřej (UPT-D) ORCID, RID, SAI
Doležal, P. (CZ)Number of authors 9 Article number 138780 Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 772, JAN (2020)Number of pages 10 s. Publication form Print - P Language eng - English Country CH - Switzerland Keywords fatigue ; laser welding ; hybrid welding ; high-strength steel ; laser-TIG ; HSLA Subject RIV JL - Materials Fatigue, Friction Mechanics OECD category Mechanical engineering Subject RIV - cooperation Institute of Physics of Materials - Materials Fatigue, Friction Mechanics R&D Projects ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) TG03010046 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) TH04010366 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UPT-D - RVO:68081731 ; UFM-A - RVO:68081723 UT WOS 000509621500028 EID SCOPUS 85076106116 DOI 10.1016/j.msea.2019.138780 Annotation The hybrid laser-tungsten inert gas welding technology was applied to butt weld 3-mm-thick S460MC and S700MC high-strength low-alloy steel sheets. The intent of low-current arc addition was to preheat the material to reduce extremely fast cooling rate accompanying laser welding. High-cycle fatigue tests were performed to evaluate the effect of welding conditions on fatigue behavior of S460MC and S700MC laser and hybrid welds. Both base materials exhibit approximately the same fatigue limit. However, corresponding samples with the weld behaved significantly different under cyclic loading. We demonstrated that the drop of their fatigue lifetime is caused by the combination of microstructural changes and especially by the presence of surface notches resulting from the welding process. The two series of both steels were tested to reveal the contribution of induced surface roughness and microstructural changes itself. The first one was in the as-welded condition. The second one had a smooth surface resulting from surface layer grinding after the welding. It was found, that the geometric notches created by the welding process are the determining factor in case of both tested steels. Testing of the ground samples showed, that in case of S460MC steel, the application of pre-heat did not improve the fatigue properties. On the other hand, the performed fatigue tests showed improved fatigue limit of ground series samples of the pre-heated S700MC steel, when compared with the conventional laser welding. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0921509319315655
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