MAG Welding tests of modern high strength steels with minimum yield strength of 700 MPa

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorLahtinen, Teemuen_US
dc.contributor.authorVilaça, Pedroen_US
dc.contributor.authorPeura, Pasien_US
dc.contributor.authorMehtonen, Saaraen_US
dc.contributor.departmentDepartment of Mechanical Engineeringen
dc.contributor.groupauthorAdvanced Manufacturing and Materialsen
dc.contributor.organizationTampere Universityen_US
dc.contributor.organizationSSAB Europe Oyen_US
dc.date.accessioned2019-05-06T09:28:01Z
dc.date.available2019-05-06T09:28:01Z
dc.date.issued2019-03-01en_US
dc.description.abstractThe modern high strength steel plates have an excellent combination of strength and toughness based on micro-alloying and complex microstructure. Retaining this combination of properties in the weld zone is a major challenge for applications in high-demanding structural construction. This work investigates the weldability of three different modern high strength steel plates, with a thickness of 8 mm. Two of the test materials were produced by a thermo-mechanically controlled process (TMCP) and one by a quenching and tempering method (Q&T). Two-passesMAG (metal active gas) welding was used with four different heat inputs. The tests implemented on all the materials included tensile, hardness profiles (HV5), Charpy-V impact toughness tests, andmicrostructure analysis using scanning electron microscope (SEM). For one of the TMCP steels, some extended tests were conducted to define how the tensile properties change along the weld line. These tests included tensile tests with digital image correlation (DIC), and 3-point bending tests. The most notable differences in mechanical properties of the welds between thematerials were observed in Charpy-V impact toughness tests, mostly at the vicinity of the fusion line, with the Q&T steel more prone to embrittlement of the heat affected zone (HAZ) than the TMCP steels. Microstructural analysis revealed carbide concentration combinedwith coarse bainitic structures inHAZ ofQ&T steel, explaining themore severe embrittlement. During the tensile tests, the DIC measurements have shown a strain localization in the softest region of the HAZ. Increasing the heat input resulted in earlier localization of the strain and less maximum strength. The tensile properties along the weld line were investigated in all welding conditions, and the results emphasize relevant and systematic differences of the yield strength at the transient zones near the start and end of the weld compared with the intermediate stationary domain.en
dc.description.versionPeer revieweden
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationLahtinen, T, Vilaça, P, Peura, P & Mehtonen, S 2019, ' MAG Welding tests of modern high strength steels with minimum yield strength of 700 MPa ', Applied Sciences (Switzerland), vol. 9, no. 5, 1031 . https://doi.org/10.3390/app9051031en
dc.identifier.doi10.3390/app9051031en_US
dc.identifier.issn2076-3417
dc.identifier.otherPURE UUID: f22f5d2a-d102-4b78-abb4-186ac00bfe5den_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/f22f5d2a-d102-4b78-abb4-186ac00bfe5den_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85063740780&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/33289907/ENG_Lahtinen_et_al_MAG_Welding_Tests_Applied_Sciences.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/37803
dc.identifier.urnURN:NBN:fi:aalto-201905062920
dc.language.isoenen
dc.publisherMDPI AG
dc.relation.ispartofseriesApplied Sciences (Switzerland)en
dc.relation.ispartofseriesVolume 9, issue 5en
dc.rightsopenAccessen
dc.subject.keywordBendingen_US
dc.subject.keywordCharpy-Ven_US
dc.subject.keywordDigital image correlationen_US
dc.subject.keywordHardnessen_US
dc.subject.keywordHigh strength steelen_US
dc.subject.keywordMetal active gas welding processen_US
dc.subject.keywordMicrostructureen_US
dc.subject.keywordQuenched and tempereden_US
dc.subject.keywordTensileen_US
dc.subject.keywordThermo-mechanically controlled processen_US
dc.subject.keywordWeldabilityen_US
dc.subject.keywordmicrostructureen_US
dc.subject.keywordquenched and tempereden_US
dc.subject.keywordMECHANICAL-PROPERTIESen_US
dc.subject.keywordhigh strength steelen_US
dc.subject.keywordTEMPERATUREen_US
dc.subject.keywordTOUGHNESSen_US
dc.subject.keywordtensileen_US
dc.subject.keywordMICROSTRUCTUREen_US
dc.subject.keywordmetal active gas welding processen_US
dc.subject.keywordINITIATIONen_US
dc.subject.keyworddigital image correlationen_US
dc.subject.keywordweldabilityen_US
dc.subject.keywordHEAT-AFFECTED ZONEen_US
dc.subject.keywordbendingen_US
dc.subject.keywordhardnessen_US
dc.subject.keywordthermo-mechanically controlled processen_US
dc.titleMAG Welding tests of modern high strength steels with minimum yield strength of 700 MPaen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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