High-cycle fatigue behavior of a laser powder bed fusion additive manufactured Ti-6Al-4V titanium: Effect of pores and tested volume size
Source abstract
Abstract
This work is focused on the effect of natural defect on the fatigue resistance of a laser powder bed fusion additively manufactured Ti-6Al-4V titanium. To reveal the fatigue strength variability and its sensitivity to the defect size, push-pull fatigue tests have been undertaken on specimens with different sizes of highly loaded volume of material. In order to easily vary the size of the highly loaded volume, specimens containing different numbers of surface hemispherical shape holes of 600 μm in diameter have been tested. This method also allowed to test small volume which triggered crack initiation from microstructural features. The fatigue damage mechanisms observed and the average natural defect size measured on the failure surfaces depend on the size of the highly stressed region. A higher fatigue strength is observed for smaller stressed volumes and defect free regions. To reduce the impact lack-of-fusion on fatigue and increase the probability of triggering crack initiation from a microstructural feature, the specimens were built in the horizontal direction. For specimens where fatigue cracks initiated at natural discontinuities, the results reported in a Kitagawa-Takahashi diagram revealed a critical defect size (√area ) in the range of 30 μm. In addition, a probabilistic approach based on the weakest link theory is proposed. The model describes a probabilistic Kitagawa-Takahashi diagram accounting for the size of both the highly stressed volume and the natural defect.
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Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · Additive Manufacturing and 3D Printing Technologies · Welding Techniques and Residual Stresses
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (42)
Show source-provided references
1. Mechanical properties and microstructural features of direct laser-deposited ti-6al-4v10.1007/s11837-015-1308-9 ↗
2. A comparison of the tensile, fatigue, and fracture behavior of ti–6al–4v and 15–5 PH stainless steel parts made by selective laser melting10.1007/s00170-013-5106-7 ↗
3. Ductility of a ti-6al-4v alloy produced by selective laser melting of prealloyed powders10.1108/13552541011083371 ↗
4. Interpretation of the fatigue anisotropy of additively manufactured ta6v alloys via a fracture mechanics approach10.1016/j.engfracmech.2019.03.048 ↗
5. Fatigue life of additively manufactured ti–6al–4v in the very high cycle fatigue regime10.1016/j.ijfatigue.2016.05.018 ↗
6. Fatigue performance of additive manufactured TiAl6v4 using electron and laser beam melting10.1016/j.ijfatigue.2016.05.001 ↗
7. Anisotropy and heterogeneity of microstructure and mechanical properties in metal additive manufacturing: A critical review10.1016/j.matdes.2017.11.021 ↗
8. Multiaxial fatigue behavior of wrought and additive manufactured ti-6al-4v including surface finish effect10.1016/j.ijfatigue.2017.03.044 ↗
9. Torsional fatigue behavior of wrought and additive manufactured ti-6al-4v by powder bed fusion including surface finish effect10.1016/j.ijfatigue.2017.03.002 ↗
10. Effects of defects in laser additive manufactured ti-6al-4v on fatigue properties10.1016/j.phpro.2014.08.120 ↗
11. Wycisk E, Siddique S, Herzog D, Walther F, Emmelmann C. Fatigue performance of laser additive manufactured ti-6al-4v in very high cycle fatigue regime up to 10 9 cycles. Front Mater 2. cited By 40. doi:10.3389/fmats.2015.00072. URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991536462&doi=10.3389%2ffmats.2015.00072&partnerID=40&md5=d11ac275cd8b18807a6e67376fbf9302.
12. Comparative study of fatigue properties of ti-6al-4v specimens built by electron beam melting (ebm) and selective laser melting (slm)10.1016/j.matchar.2018.03.028 ↗
13. Numerical modelling of surface roughness effect on the fatigue behavior of ti-6al-4v obtained by additive manufacturing10.1016/j.ijfatigue.2019.02.014 ↗
14. A review of the fatigue properties of additively manufactured ti-6al-4v10.1007/s11837-017-2728-5 ↗
15. Effect of test piece length on the fatigue strength of steel in air10.1007/BF00714989 ↗
16. Defect tolerant design of automotive components10.1016/S0142-1123(96)00079-5 ↗
17. Sif and threshold for small cracks at small notches under torsion10.1046/j.1460-2695.2000.00260.x ↗
18. Probabilistic modeling of fatigue life distribution and size effect of components with random defects10.1016/j.ijfatigue.2019.05.005 ↗
19. Experimental investigation of the size effect in high cycle fatigue: Role of the defect population in cast aluminium alloys10.1016/j.ijfatigue.2019.105222 ↗
20. Hcf of aa7050 alloy containing surface defects: Study of the statistical size effect10.1016/j.ijfatigue.2018.01.012 ↗
21. A new approach to correlate the defect population with the fatigue life of selective laser melted ti-6al-4v alloy10.1016/j.ijfatigue.2020.105584 ↗
22. Kitagawa TSH. Applicability of fracture mechanics to very small cracks. In: ASM Proceedings of 2nd international conference on mechanical Metalspark, Ohio; 1976. p. 627–31.
23. A. International, ASTM F3001-14, Standard Specification for Additive Manufacturing Titanium-6 Aluminum-4 Vanadium ELI (Extra Low Interstitial) with Powder Bed FusionCited By 5.
24. Fatigue and fracture mechanics, vol. 29. ASTM Special Technical Publication// STP. ASTM; 1999. https://books.google.fr/books?id=Vqkrnp825HQC.
25. Effect of mean stress on the fatigue strength of high-strength steels containing small defects or nonmetallic inclusions10.1299/kikaia.56.1074 ↗
26. A competition between the contour and hatching zones on the high cycle fatigue behaviour of a 316l stainless steel: Analyzed using x-ray computed tomography10.1016/j.msea.2019.04.101 ↗
27. Xu Z, Liu A, Wang X. The influence of building direction on the fatigue crack propagation behavior of ti6al4v alloy produced by selective laser melting. Mater Sci Eng A 767. doi: 10.1016/j.msea.2019.138409. cited By 0. https://www.scopus.com/inward/record.uri?eid=2-s2.0-85072222975&doi=10.1016%2fj.msea.2019.138409&partnerID=40&md5=6fc753c1c2439bb3db5f70088d1fc896.
28. Characterization of bending vibration fatigue of slm fabricated ti-6al-4v10.1016/j.ijfatigue.2017.02.005 ↗
29. On the use of critical distance theories for the prediction of the high cycle fatigue limit stress in notched ti-6al-4v10.1016/j.ijfatigue.2004.06.002 ↗
30. ASTM International. West Conshohocken, PA: Standard Test Method for Measurement of Fatigue Crack Growth Rates; 2015.
31. Sonsino C, Kaufmann H, Grubišic V. Transferability of material data for the example of a randomly loaded forged truck stub axle. SAE Technical Papers. doi: 10.4271/970708. Cited By 25. https://www.scopus.com/inward/record.uri?eid=2-s2.0-85072464298&doi=10.4271%2f970708&partnerID=40&md5=9df9be19598d8f876daa635eb5da9f82.
32. Characterization of bending vibration fatigue of wbd fabricated ti-6al-4v10.1016/j.ijfatigue.2017.03.045 ↗
33. Microstructural characterization and comparison of ti-6al-4v manufactured with different additive manufacturing processes10.1016/j.matchar.2018.02.003 ↗
34. Murakami · 2002
35. Size effect in fatigue based on the extreme value distribution of defects10.1016/j.msea.2013.11.045 ↗
36. A Statistical Theory of the Strength of Materials
37. A statistical distribution function of wide applicability10.1115/1.4010337 ↗
38. Freudenthal A. In: Liebowitz H, editor. Fracture, vol. 2; 1968. p. 591–619. doi: 10.1016/j.engfracmech.2019.03.048.10.1016/j.engfracmech.2019.03.048 ↗
39. Abramowitz · 1965
40. Fatigue crack growth and thresholds at ultrasonic frequencies10.1016/j.ijfatigue.2005.06.058 ↗
41. Physically short crack propagation in metals during high cycle fatigue10.1016/j.ijfatigue.2009.03.002 ↗
42. Notch fatigue and crack growth resistance of ti-6al-4v eli additively manufactured via selective laser melting: A critical distance approach to defect sensitivity10.1016/j.ijfatigue.2018.12.020 ↗