Casting defects in structural components: Are they all dangerous? A 3D study
Source abstract
Abstract
Abstract The influence of defects parameters (i.e., size, shape and location) on early crack nucleation in an A357-T6 cast aluminium alloy is studied by means of synchrotron in situ fatigue testing and 3D microstructure based FE simulations. An experimental procedure using laboratory tomography is developed to produce specimens containing controlled internal defects. Two types of defects are investigated: natural shrinkages and artificial defects. Results show that is not possible to assert the harmfulness of a defect if only its size (using A parameter) is taken into account. Location is critical: it is observed that ten times smaller surface defects are able to lead to final failure even when a ∅ = 1 mm internal artificial defect is present within the specimen gauge. Regardless the size, location and nature (artificial or shrinkages) of the defect, the shape is also a factor to take into account because the earliest crack nucleation are observed to occur at regions were the Kt values are the highest. For defects of similar nature and size, Kt evaluations give good indication of the defect tendency to early nucleation.
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Fatigue and fracture mechanics · Non-Destructive Testing Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
Show source-provided references
1. Polmear · 2006
2. ASM handbook: casting
3. Casting defects and the fatigue behaviour of an aluminium casting alloy
4. Fatigue life assessment of aluminum alloys with casting defects10.1016/0013-7944(93)90108-5 ↗
5. Odegård J, Pedersen K. Fatigue Properties of an A356 (AlSi7Mg) Aluminium alloy for automotive applications - fatigue life prediction, SAE International, Technical Paper 940811. doi:https://doi.org/10.4271/940811.10.4271/940811 ↗
6. Microstructural effects on high-cycle fatigue-crack initiation in A356.2 casting alloy10.1007/s11661-999-0306-3 ↗
7. Fatigue behavior of A356-T6 aluminum cast alloys. Part I. Effect of casting defects10.1016/S1471-5317(00)00008-0 ↗
8. Experimental study of porosity and its relation to fatigue mechanisms of model Al–Si7–Mg0.3 cast Al alloys10.1016/S0921-5093(01)01225-4 ↗
9. Influence of porosity on the fatigue limit of die cast magnesium and aluminium alloys10.1016/S0142-1123(02)00054-3 ↗
10. The effect of porosity on the fatigue life of cast aluminium-silicon alloys
11. Statistical modeling of microstructure and defect population effects on the fatigue performance of cast A356-T6 automotive components10.1016/j.msea.2006.07.003 ↗
12. Effect of casting imperfections on the fatigue life of 319-F and A356-T6 Al-Si casting alloys10.1016/j.msea.2007.03.112 ↗
13. Effects of microstructure and temperature on fatigue behavior of E319-T7 cast aluminum alloy in very long life cycles10.1016/j.ijfatigue.2005.04.016 ↗
14. High cycle fatigue strength of permanent mold and rheocast aluminum 357 alloy10.1016/j.ijfatigue.2010.01.001 ↗
15. Microtomographic study and finite element analysis of the porosity harmfulness in a cast aluminium alloy10.1016/j.ijfatigue.2011.06.010 ↗
16. Influence of surface and internal casting defects on the fatigue behaviour of A357-T6 cast aluminium alloy10.1016/j.ijfatigue.2015.07.032 ↗
17. Chapter 6 - Gas porosity
18. Chapter 7 - Solidification shrinkage
19. Schijve · 2009
20. Suresh · 2003
21. ASTM Standard E155-10. Standard Reference Radiographs for Inspection of Aluminum and Magnesium Castings; 2010. doi:https://doi.org/10.1520/E0155-10. URL https://www.astm.org/DATABASE.CART/HISTORICAL/E155-10.htm.
22. Effects of defects, inclusions and inhomogeneities on fatigue strength10.1016/0142-1123(94)90001-9 ↗
23. Quantitative evaluation of fatigue strength of metals containing various small defects or cracks10.1016/0013-7944(83)90018-8 ↗
24. Multiaxial fatigue limit criterion for defective materials10.1016/j.engfracmech.2005.06.005 ↗
25. The theory of critical distances: a review of its applications in fatigue10.1016/j.engfracmech.2006.12.004 ↗
26. Comparison between defects and micro-notches in multiaxial fatigue - the size effect and the gradient effect10.1016/j.ijfatigue.2008.09.005 ↗
27. Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy10.1016/j.actamat.2009.04.008 ↗
28. X-ray computed tomography vs. metallography for pore sizing and fatigue of cast Al-alloys10.1016/j.proeng.2010.03.059 ↗
29. Influence of natural defects on the fatigue limit of a cast Al-Si alloy10.1016/j.prostr.2017.11.120 ↗
30. Le VD. Etude de l’influence des hétérogénéités microstructurales sur la tenue en fatigue à grand nombre de cycles des alliages d’aluminium de fonderie. PhD Work, Mécanique-matériaux Paris, ENSAM; 2016. URL .
31. Location, location & size: defects close to surfaces dominate fatigue crack initiation10.1038/srep45239 ↗
32. An overview on the influence of the atmosphere environment on ultra-high-cycle fatigue and ultra-slow fatigue crack propagation10.1016/j.ijfatigue.2005.06.057 ↗
33. Effect of frequency, environment, and temperature on fatigue behavior of E319 cast-aluminum alloy: small-crack propagation10.1007/s11661-008-9630-2 ↗
34. 3D analytical mathematical models of random star-shape particles via a combination of X-ray computed microtomography and spherical harmonic analysis10.1016/j.apt.2016.10.014 ↗
35. Centre Technique des Industies de la Fonderie (CTIF) [accessed 2018]. [link]. URL .
36. Serrano-Munoz · 2014
37. Swiss Light Source (SLS), TOMCAT beamline. [accessed 2018]. [link]. URL .
38. Europenan Synchrotron Radiation Facility (ESRF), ID19 beamline [accessed 2018]. [link]. URL .
39. In situ experiments with x ray tomography: an attractive tool for experimental mechanics10.1007/s11340-010-9333-7 ↗
40. Fiji: an open-source platform for biological-image analysis10.1038/nmeth.2019 ↗
41. AVIZO, FEI’s 3D visualization solutions [accessed 2018]. [link]. URL .
42. The morphological evolution of dendritic microstructures during coarsening10.1016/j.actamat.2005.11.031 ↗
43. Gmsh: A 3-D finite element mesh generator with built-in pre- and post-processing facilities10.1002/nme.2579 ↗
44. ABAQUS-FEA [accessed 2018]. [link]. URL .
45. The influence of porosity on fatigue crack initiation in additively manufactured titanium components10.1038/s41598-017-06504-5 ↗
46. 3D characterization and modeling of low cycle fatigue damage mechanisms at high temperature in a cast aluminum alloy10.1016/j.actamat.2016.10.028 ↗
47. A finite element modelling study of strain localization in the vicinity of near-surface cavities as a cause of subsurface fatigue crack initiation10.1023/A:1016350528652 ↗
48. Effects of pore position in depth on stress/strain concentration and fatigue crack initiation10.1007/s11661-011-0947-x ↗
49. Study of the interaction of a short fatigue crack with grain boundaries in a cast al alloy using x-ray microtomography10.1016/S1359-6454(02)00320-8 ↗