Fatigue strength improvement of welded structures using new low transformation temperature filler materials
2013 (English)In: Fatigue Design 2013, International Conference Proceedings, Elsevier, 2013, 192-201 p.Conference paper (Refereed)
The results reported in this research study are part of a larger EU RFCS (Research Fund for Coal and Steel) project where the aim is to study the fatigue behavior of improved welds in high strength steels by utilizing different improvement techniques. In this particular study LTT (Low Transformation Temperature) weld filler material have been investigated and their possibility to improve the fatigue strength. The characteristic of these filler material is that they undergo phase transformation at temperature close to room temperature which will reduce the tensile residual stress in the weld and in some cases result in compressive residual stresses. Two different LTT alloy compositions have been developed, with different Ms (Martensite Start) temperatures in order to study the amount of tensile/compressive residual stresses produced by these wires. Welding residual stress measurements were carried out by X-ray diffraction technique. Plates with welded longitudinal attachments were fabricated in 700 MPa and 960 MPa steel grades using different LTT filler materials. These specimens were fatigue tested in constant and variable amplitude loading and the fatigue test results were compared with results from specimen welded with conventional weld filler material.
Place, publisher, year, edition, pages
Elsevier, 2013. 192-201 p.
, Procedia Engineering, ISSN 1877-7058 ; 66
Fatigue testing, LTT, Residual stresses, Welded joints
IdentifiersURN: urn:nbn:se:kth:diva-147456DOI: 10.1016/j.proeng.2013.12.074ISI: 000338327000019ScopusID: 2-s2.0-84894422734OAI: oai:DiVA.org:kth-147456DiVA: diva2:735925
5th International Conference on Fatigue Design, Fatigue Design 2013, 27 November 2013 through 28 November 2013, Senlis, France
QC 201408042014-08-042014-06-272015-05-29Bibliographically approved