Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue (VHCF) regime up to 10<sup>9</sup> cycles
Additive manufacturing technologies are in the process of establishing themselves as an alternative production technology to conventional manufacturing such as casting or milling. Especially laser additive manufacturing (LAM) enables the production of metallic parts with mechanical properties compar...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2015-12-01
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| Series: | Frontiers in Materials |
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| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fmats.2015.00072/full |
| _version_ | 1818620331972100096 |
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| author | Eric eWycisk Shafaqat eSiddique Dirk eHerzog Frank eWalther Claus eEmmelmann |
| author_facet | Eric eWycisk Shafaqat eSiddique Dirk eHerzog Frank eWalther Claus eEmmelmann |
| author_sort | Eric eWycisk |
| collection | DOAJ |
| description | Additive manufacturing technologies are in the process of establishing themselves as an alternative production technology to conventional manufacturing such as casting or milling. Especially laser additive manufacturing (LAM) enables the production of metallic parts with mechanical properties comparable to conventionally manufactured components. Due to the high geometrical freedom in LAM the technology enables the production of ultra-light weight designs and therefore gains increasing importance in aircraft and space industry. The high quality standards of these industries demand predictability of material properties for static and dynamic load cases. However, fatigue properties especially in the very high cycle fatigue regime until 10<sup>9</sup> cycles have not been sufficiently determined yet. Therefore this paper presents an analysis of fatigue properties of laser additive manufactured Ti-6Al-4V under cyclic tension-tension until 10<sup>7</sup> cycles and tension-compression load until 10<sup>9</sup> cycles.For the analysis of laser additive manufactured titanium alloy Ti-6Al-4V Woehler fatigue tests under tension-tension and tension-compression were carried out in the high cycle and very high cycle fatigue regime. Specimens in stress-relieved as well as hot-isostatic-pressed conditions were analyzed regarding crack initiation site, mean stress sensitivity and overall fatigue performance. The determined fatigue properties show values in the range of conventionally manufactured Ti-6Al-4V with particularly good performance for hot-isostatic-pressed additive-manufactured material. For all conditions the results show no conventional fatigue limit but a constant increase in fatigue life with decreasing loads. No effects of test frequency on life span could be determined. However, independently of testing principle, a shift of crack initiation from surface to internal initiation could be observed with increasing cycles to failure. |
| first_indexed | 2024-12-16T17:51:41Z |
| format | Article |
| id | doaj.art-03f691865fa440f6ae87fc394de90d0b |
| institution | Directory Open Access Journal |
| issn | 2296-8016 |
| language | English |
| last_indexed | 2024-12-16T17:51:41Z |
| publishDate | 2015-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Materials |
| spelling | doaj.art-03f691865fa440f6ae87fc394de90d0b2022-12-21T22:22:17ZengFrontiers Media S.A.Frontiers in Materials2296-80162015-12-01210.3389/fmats.2015.00072165358Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue (VHCF) regime up to 10<sup>9</sup> cyclesEric eWycisk0Shafaqat eSiddique1Dirk eHerzog2Frank eWalther3Claus eEmmelmann4Hamburg University of TechnologyTU Dortmund UniversityHamburg University of TechnologyTU Dortmund UniversityHamburg University of TechnologyAdditive manufacturing technologies are in the process of establishing themselves as an alternative production technology to conventional manufacturing such as casting or milling. Especially laser additive manufacturing (LAM) enables the production of metallic parts with mechanical properties comparable to conventionally manufactured components. Due to the high geometrical freedom in LAM the technology enables the production of ultra-light weight designs and therefore gains increasing importance in aircraft and space industry. The high quality standards of these industries demand predictability of material properties for static and dynamic load cases. However, fatigue properties especially in the very high cycle fatigue regime until 10<sup>9</sup> cycles have not been sufficiently determined yet. Therefore this paper presents an analysis of fatigue properties of laser additive manufactured Ti-6Al-4V under cyclic tension-tension until 10<sup>7</sup> cycles and tension-compression load until 10<sup>9</sup> cycles.For the analysis of laser additive manufactured titanium alloy Ti-6Al-4V Woehler fatigue tests under tension-tension and tension-compression were carried out in the high cycle and very high cycle fatigue regime. Specimens in stress-relieved as well as hot-isostatic-pressed conditions were analyzed regarding crack initiation site, mean stress sensitivity and overall fatigue performance. The determined fatigue properties show values in the range of conventionally manufactured Ti-6Al-4V with particularly good performance for hot-isostatic-pressed additive-manufactured material. For all conditions the results show no conventional fatigue limit but a constant increase in fatigue life with decreasing loads. No effects of test frequency on life span could be determined. However, independently of testing principle, a shift of crack initiation from surface to internal initiation could be observed with increasing cycles to failure.http://journal.frontiersin.org/Journal/10.3389/fmats.2015.00072/full3D printingTitanium alloyTi-6Al-4VVery high cycle fatigue (VHCF)Selective laser meltingLaser additive manufacturing |
| spellingShingle | Eric eWycisk Shafaqat eSiddique Dirk eHerzog Frank eWalther Claus eEmmelmann Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue (VHCF) regime up to 10<sup>9</sup> cycles Frontiers in Materials 3D printing Titanium alloy Ti-6Al-4V Very high cycle fatigue (VHCF) Selective laser melting Laser additive manufacturing |
| title | Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue (VHCF) regime up to 10<sup>9</sup> cycles |
| title_full | Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue (VHCF) regime up to 10<sup>9</sup> cycles |
| title_fullStr | Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue (VHCF) regime up to 10<sup>9</sup> cycles |
| title_full_unstemmed | Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue (VHCF) regime up to 10<sup>9</sup> cycles |
| title_short | Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue (VHCF) regime up to 10<sup>9</sup> cycles |
| title_sort | fatigue performance of laser additive manufactured ti 6al 4v in very high cycle fatigue vhcf regime up to 10 lt sup gt 9 lt sup gt cycles |
| topic | 3D printing Titanium alloy Ti-6Al-4V Very high cycle fatigue (VHCF) Selective laser melting Laser additive manufacturing |
| url | http://journal.frontiersin.org/Journal/10.3389/fmats.2015.00072/full |
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