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Comparison of effect of shot-peening with HFMI treatment or use of LTT consumables on fatigue strength of 1300 MPa yield strength steel weldments
University West, Department of Engineering Science, Division of Welding Technology. ITW Welding AB, Järntrådsvägen 2, Partille, SE-433 30, Sweden. (PTW)ORCID iD: 0000-0003-4978-390X
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0003-2560-0531
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-8822-2705
2020 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 64, no 7, p. 1237-1244Article in journal (Refereed) Published
Abstract [en]

In this paper, T-joint samples in a 1300 MPa yield strength steel were produced using conventional or low transformation temperature (LTT) type consumables. The welded samples were either subjected to high-frequency mechanical impact (HFMI) treatment or to shot-peening. Fatigue testing was performed under fully reversed, constant amplitude bending load. Shot-peening gave a significant increase in fatigue strength for more than around 50,000 cycles. Shot-peened LTT welds had the highest fatigue strength, with conventional welds being shot-peened having slightly lower fatigue strength. HFMI treatment of conventional and LTT welds improved the fatigue strength also, but to a lesser extent, keeping the slope in the SN diagram close to three, while shot-peened samples had a slope of 5–7. Significant differences in compressive residual stress were seen between the different welds, with the most compressive stress found in the shot-peened samples. This was probably one of the main reasons for the improved fatigue life of shot-peened samples. © 2020, The Author(s).

Place, publisher, year, edition, pages
2020. Vol. 64, no 7, p. 1237-1244
Keywords [en]
Fatigue testing; Residual stresses; Shot peening; Welds; Yield stress, Compressive residual stress; Constant amplitude; Fatigue strength; Fully reversed; High frequency HF; Low transformation-temperature; Mechanical impacts; Steel weldments, Fatigue of materials
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-15731DOI: 10.1007/s40194-020-00917-zISI: 000532177500003Scopus ID: 2-s2.0-85084581855OAI: oai:DiVA.org:hv-15731DiVA, id: diva2:1460353
Available from: 2020-08-24 Created: 2020-08-24 Last updated: 2020-10-27Bibliographically approved

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Harati, EbrahimSvensson, Lars-ErikKarlsson, Leif

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