Brittle coating effects on fatigue cracks behavior in Ti alloys
Source abstract
Abstract
Abstract In order to study the coating effects on fatigue crack initiation mechanism in Ti-alloys, two types of brittle coatings, CrAlN and TiN, were deposited on the surface of TC4 titanium alloy by physical vapor deposition. The tension-tension fatigue tests and the in-situ observations of fatigue crack morphology were performed to study the coating effects on the fatigue crack initiation and propagation in the Ti-6Al-4V alloy. It was found that the 510–530 MPa TC4 fatigue limit is reduced to 315–330 MPa due to the CrAlN coating. The brittle coatings impeded the deformation of the TC4 samples at the beginning stage of fatigue tests, while coating cracking promoted the elongation of the tested samples. Fatigue crack was found to be initiated in the brittle coatings and propagated to the coating-substrate interface, inducing micro-damage of the substrate surface. The fracture surface of coated and uncoated samples was quite different, and the formation of non-propagating fatigue cracks was also observed. The coating cracking-induced low cyclic stress substrate damage model was proposed. This study should be of significance for the coating improvement and provides a theoretical basis for improving fatigue properties of coating materials.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fatigue and fracture mechanics · Metal and Thin Film Mechanics · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. High temperature cyclic pressurization of titanium ducts for use in aircraft pneumatic systems10.1016/j.matdes.2008.08.010 ↗
2. On ‘multi-stage’ fatigue life diagrams and the relevant life-controlling mechanisms in ultrahigh-cycle fatigue10.1046/j.1460-2695.2002.00550.x ↗
3. Effect of WC/C PVD coating on fatigue behaviour of case carburized SAE8620 steel10.1016/j.surfcoat.2010.07.022 ↗
4. Fatigue strength at a number of cycles of thin hard coated steels with quench-hardened substrates10.1016/0257-8972(94)02356-5 ↗
5. Fatigue behaviour of 42Cr Mo4 steel with PVD coatings10.1016/S0142-1123(97)00007-8 ↗
6. Fatigue behavior of a 316L stainless steel coated with a DLC film deposited by PVD magnetron sputter ion plating10.1016/j.msea.2009.09.030 ↗
7. Fatigue behavior of PVD coated Ti–6Al–4V alloy10.1016/j.ijfatigue.2010.11.007 ↗
8. Fatigue fracture behavior of Ti-6Al-4V PVD coated10.1016/j.proeng.2010.03.200 ↗
9. Propensities of crack interior initiation and early growth for very-high-cycle fatigue of high strength steels10.1016/j.ijfatigue.2013.02.023 ↗
10. Very high cycle fatigue of high-strength steels: Crack initiation by FGA formation investigated at artificial defects10.1016/j.prostr.2016.06.141 ↗
11. Factors influencing the mechanism of superlong fatigue failure in steels10.1046/j.1460-2695.1999.00187.x ↗
12. Mechanisms and modeling of subsurface fatigue cracking in metals10.1016/j.engfracmech.2013.05.013 ↗
13. Crack initiation mechanisms of Ti6Al4V in the very high cycle fatigue regime10.1016/j.ijfatigue.2016.04.026 ↗
14. Deformation structure and subsurface fatigue crack generation in austenitic steels at low temperature10.1007/s11661-998-0272-1 ↗
15. Dislocation interactions and crack nucleation in a fatigued near-alpha titanium alloy10.1016/j.ijplas.2018.06.009 ↗
16. Analysis of fatigue properties and failure mechanisms of Ti6Al4V in the very high cycle fatigue regime using ultrasonic technology and 3D laser scanning vibrometry10.1016/j.ultras.2013.03.002 ↗
17. Slip transfer and deformation structures resulting from the low cycle fatigue of near-alpha titanium alloy Ti-6242Si10.1016/j.ijplas.2017.09.012 ↗
18. The formation of subsurface non-defect fatigue crack origins10.1016/j.ijfatigue.2005.06.060 ↗
19. Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy10.1111/ffe.12562 ↗
20. Effect of grain size on fatigue-crack growth in 2524 aluminium alloy10.1016/j.ijfatigue.2015.11.011 ↗
21. Microstructural effects on the fatigue crack growth resistance of a stainless steel CA6NM weld10.1016/j.engfracmech.2013.11.013 ↗
22. The effect of grain size on fatigue crack propagation in commercial pure titanium investigated by acoustic emission10.1007/s11665-015-1545-7 ↗
23. Fatigue crack propagation behaviour of steels with different microstructures10.1016/j.msea.2012.04.103 ↗
24. Plastic strain amplitude dependent surface path of microstructurally short fatigue cracks in face-centred cubic metals10.1016/S0921-5093(99)00060-X ↗
25. Probabilistic fatigue S-N curves including the super-long life regime of a railway axle steel10.1016/j.ijfatigue.2009.04.016 ↗
26. Deformation of thin films on solid substrates10.1080/14786435808243240 ↗
27. Interaction of an edge dislocation with a thin-film-covered crack10.1016/S0020-7683(99)00238-3 ↗
28. Interaction of a screw dislocation with a thin-film-covered mode III crack10.1016/1359-6454(96)00066-3 ↗
29. The interaction of dislocations and boundaries10.1016/0001-6160(69)90037-6 ↗
30. Fatigue crack propagation behaviour derived from S-N data in very high cycle regime10.1046/j.1460-2695.2002.00547.x ↗
31. Quantitative evaluation of effects of non-metallic inclusions on fatigue strength of high strength steels. I: basic fatigue mechanism and evaluation of correlation between the fatigue fracture stress and the size and location of non-metallic inclusions10.1016/0142-1123(89)90054-6 ↗
32. In-situ stress gradient evolution and texture-dependent fracture of brittle ceramic thin films under external load10.1016/j.ceramint.2018.01.265 ↗
33. Fracture toughness measurement on TiN hard coatings using internal energy induced cracking10.1016/j.surfcoat.2013.11.010 ↗
34. A theoretical model of semi-elliptic surface crack growth10.1016/j.cja.2014.04.012 ↗
35. A numerical analysis on the interaction of twin coplanar flaws10.1016/S0013-7944(03)00040-7 ↗
36. Modeling of fatigue crack growth from a notch10.1016/j.ijplas.2006.10.010 ↗