Improved fatigue strength of additively manufactured Ti6Al4V by surface post processing
•Surface post processes are needed for PBF Ti6Al4V to achieve high fatigue strength.•Centrifugal finishing of L-PBF Ti6Al4V gave the highest fatigue strength.•Laser polished material had reduced fatigue strength although low surface roughness. A major challenge for additively manufactured structural...
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| Published in | International journal of fatigue Vol. 134; pp. 105497 - 12 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Kidlington
Elsevier Ltd
01.05.2020
Elsevier BV |
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| Online Access | Get full text |
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| Abstract | •Surface post processes are needed for PBF Ti6Al4V to achieve high fatigue strength.•Centrifugal finishing of L-PBF Ti6Al4V gave the highest fatigue strength.•Laser polished material had reduced fatigue strength although low surface roughness.
A major challenge for additively manufactured structural parts is the low fatigue strength connected to rough as-built surfaces. In this study, Ti6Al4V manufactured with laser powder bed fusion (L-PBF) and electron beam powder bed fusion (E-PBF) have been subjected to five surface processing methods, shot peening, laser shock peening, centrifugal finishing, laser polishing and linishing, in order to increase the fatigue strength. Shot peened and centrifugal finished L-PBF material achieved comparable fatigue strength to machined material. Moreover, the surface roughness alone was found to be an insufficient indicator on the fatigue strength since subsurface defects were hidden below smooth surfaces. |
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| AbstractList | A major challenge for additively manufactured structural parts is the low fatigue strength connected to rough as-built surfaces. In this study, Ti6Al4V manufactured with laser powder bed fusion (L-PBF) and electron beam powder bed fusion (E-PBF) have been subjected to five surface processing methods, shot peening, laser shock peening, centrifugal finishing, laser polishing and linishing, in order to increase the fatigue strength. Shot peened and centrifugal finished L-PBF material achieved comparable fatigue strength to machined material. Moreover, the surface roughness alone was found to be an insufficient indicator on the fatigue strength since subsurface defects were hidden below smooth surfaces. •Surface post processes are needed for PBF Ti6Al4V to achieve high fatigue strength.•Centrifugal finishing of L-PBF Ti6Al4V gave the highest fatigue strength.•Laser polished material had reduced fatigue strength although low surface roughness. A major challenge for additively manufactured structural parts is the low fatigue strength connected to rough as-built surfaces. In this study, Ti6Al4V manufactured with laser powder bed fusion (L-PBF) and electron beam powder bed fusion (E-PBF) have been subjected to five surface processing methods, shot peening, laser shock peening, centrifugal finishing, laser polishing and linishing, in order to increase the fatigue strength. Shot peened and centrifugal finished L-PBF material achieved comparable fatigue strength to machined material. Moreover, the surface roughness alone was found to be an insufficient indicator on the fatigue strength since subsurface defects were hidden below smooth surfaces. |
| ArticleNumber | 105497 |
| Author | Ansell, H. Newton, L. Basu, D. Moverare, J.J. Kahlin, M. Kerwin, A. Smith, B. |
| Author_xml | – sequence: 1 givenname: M. surname: Kahlin fullname: Kahlin, M. email: magnus.kahlin@saabgroup.com organization: Saab AB, Aeronautics, SE-58188 Linköping, Sweden – sequence: 2 givenname: H. surname: Ansell fullname: Ansell, H. organization: Saab AB, Aeronautics, SE-58188 Linköping, Sweden – sequence: 3 givenname: D. surname: Basu fullname: Basu, D. organization: Manufacturing Technology Centre, Coventry CV7 9JU, UK – sequence: 4 givenname: A. surname: Kerwin fullname: Kerwin, A. organization: Manufacturing Technology Centre, Coventry CV7 9JU, UK – sequence: 5 givenname: L. surname: Newton fullname: Newton, L. organization: Manufacturing Metrology Team, University of Nottingham, Nottingham NG7 2RD, UK – sequence: 6 givenname: B. surname: Smith fullname: Smith, B. organization: Manufacturing Technology Centre, Coventry CV7 9JU, UK – sequence: 7 givenname: J.J. surname: Moverare fullname: Moverare, J.J. organization: Division of Engineering Materials, Linköping University, SE-581 83 Linköping, Sweden |
| BackLink | https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-164853$$DView record from Swedish Publication Index |
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| Snippet | •Surface post processes are needed for PBF Ti6Al4V to achieve high fatigue strength.•Centrifugal finishing of L-PBF Ti6Al4V gave the highest fatigue... A major challenge for additively manufactured structural parts is the low fatigue strength connected to rough as-built surfaces. In this study, Ti6Al4V... |
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| StartPage | 105497 |
| SubjectTerms | Additive manufacturing Electron beams Fatigue Fatigue strength Heat treating Laser beams Laser shock processing Lasers Materials fatigue Post processes Powder beds Rapid prototyping Shot peening Surface roughness Ti6Al4V Titanium base alloys |
| Title | Improved fatigue strength of additively manufactured Ti6Al4V by surface post processing |
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