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Residual stresses in 18CrNiMo7-6 linear friction welded high strength steel chains

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Abstract

Linear friction welding is a solid-state process that comprises rapid heating and cooling of the welded parts. Residual stresses (RS) as in every other welding process cannot be avoided. The presence of RS compromises the in-service performance and reliability. They influence stress corrosion cracking, fatigue strength, and the crack growth rate. Knowing the magnitude and nature of such stresses is critical for improving the quality of welded joints. Therefore, four different manufacturing stages of linear friction welded chain links were analyzed in the present study: “as forged” (F), “as welded” (A), “as welded” without flash (N), and post weld heat treated (P). The residual stress field was measured using the hole drilling (HD) method. The results of the hole drilling method showed to be independent of the measured position and symmetry with respect to the weld was observed in all evaluated regions. Close to the weld center line (WCL), the compressive stresses present in the “as forged” condition switched to tensile as a result of the welding process. However, in further regions, stresses remained almost unchanged for either A and N. The PWHT uniformizes the residual stress field along the whole weld region.

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Acknowledgements

The authors gratefully acknowledge the financial support of this work by the project JOIN. The K-Project Network of Excellence for Joining Technologies JOIN is fostered in the frame of COMET—Competence Centers for Excellent Technologies by BMVIT, BMWFJ, FFG, Land Oberöstereich, Land Steiermark, SFG, and ZIT. The program COMET is handled by FFG.

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Authors and Affiliations

  1. IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal

    D. G. Nunes, L. Quintino & I. Pires

  2. Institute of Materials Science and Welding, Graz University of Technology, Kopernikusgasse 24/I, 8010, Graz, Austria

    P. S. Effertz & N. Enzinger

  3. pewag austria GmbH, Mariazeller Straβe 143, 8605, Kapfenberg, Austria

    F. Fuchs

Authors
  1. D. G. Nunes
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  2. P. S. Effertz
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  3. L. Quintino
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  4. I. Pires
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  5. F. Fuchs
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  6. N. Enzinger
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Correspondence to D. G. Nunes.

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Nunes, D.G., Effertz, P.S., Quintino, L. et al. Residual stresses in 18CrNiMo7-6 linear friction welded high strength steel chains. Int J Adv Manuf Technol 96, 3703–3710 (2018). https://doi.org/10.1007/s00170-018-1850-z

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  • DOI: https://doi.org/10.1007/s00170-018-1850-z

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