Effect of titanium on the weldability of thermomechanically rolled high-strength cold-formable steels

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorMourujärvi, Juhoen_US
dc.contributor.authorTihinen, Sakarien_US
dc.contributor.authorMehtonen, Saaraen_US
dc.contributor.authorLahtinen, Teemuen_US
dc.contributor.authorSantos Vilaca da Silva, Pedroen_US
dc.contributor.authorKaijalainen, Anttien_US
dc.contributor.authorPorter, Daviden_US
dc.contributor.authorKömi, Jukkaen_US
dc.contributor.departmentDepartment of Mechanical Engineeringen
dc.contributor.groupauthorEngineering Materialsen
dc.contributor.organizationUniversity of Ouluen_US
dc.contributor.organizationSSAB Europe Oyen_US
dc.date.accessioned2018-02-09T09:56:43Z
dc.date.available2018-02-09T09:56:43Z
dc.date.issued2017en_US
dc.description.abstractThis research is concerned with the effect of titanium in the range 0.01 to 0.13 wt. % on the base plate and weldability properties of laboratory hot-rolled cold-formable steels with yield strengths in the range 500 - 900 MPa (S500MC - S900MC). Different strength levels were achieved by varying the contents of boron, chromium, molybdenum and manganese. For the base metal, titanium had a small strengthening effect and it also raised the impact transition temperature. In MAG welding (t8/5 = 5 s), titanium had a strengthening effect probably due to precipitation strengthening which was seen both in the strength of the welded steels and in the lower hardness difference between the base metal and the HAZ. Titanium, especially with higher concentrations, had a clear negative effect on the impact toughness of the fusion line and a somewhat smaller negative effect on the impact toughness of the fusion line + 1 mm position. This was probably due to the presence of large angular TiN inclusions promoting cleavage crack nucleation. Also unlike small TiN particles precipitated from the solid state, these inclusions are ineffective in preventing austenite grain coarsening in the coarse-grained HAZ (CGHAZ). Overall, high titanium contents have been shown to have a detrimental effect on HAZ properties: although titanium reduces the softening of the HAZ experienced in these types of steels, it has a clear negative effect on the HAZ impact toughness with low heat input.en
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationMourujärvi, J, Tihinen, S, Mehtonen, S, Lahtinen, T, Santos Vilaca da Silva, P, Kaijalainen, A, Porter, D & Kömi, J 2017, Effect of titanium on the weldability of thermomechanically rolled high-strength cold-formable steels . in METAL 2017 - 26th International Conference on Metallurgy and Materials, Conference Proceedings . vol. 2017-January, TANGER Ltd., pp. 936-941, International Conference on Metallurgy and Materials, Brno, Czech Republic, 24/05/2017 . < https://research.aalto.fi/files/17218009/METAL_2017_Final_Mourujarvi.pdf >en
dc.identifier.otherPURE UUID: 41f45fbf-2985-409f-8051-fcc12df84634en_US
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dc.identifier.otherPURE LINK: https://research.aalto.fi/files/17218009/METAL_2017_Final_Mourujarvi.pdfen_US
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dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/29805
dc.identifier.urnURN:NBN:fi:aalto-201802091301
dc.language.isoenen
dc.relation.ispartofInternational Conference on Metallurgy and Materialsen
dc.relation.ispartofseriesProceedings of the 26th International Conference on Metallurgy and Materials, METAL 2017en
dc.rightsopenAccessen
dc.subject.keywordHAZen_US
dc.subject.keywordHigh strength steelen_US
dc.subject.keywordTi/N ratioen_US
dc.subject.keywordTitaniumen_US
dc.subject.keywordWeldabilityen_US
dc.titleEffect of titanium on the weldability of thermomechanically rolled high-strength cold-formable steelsen
dc.typeConference article in proceedingsfi
dc.type.versionacceptedVersion
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