Influence of surface and internal casting defects on the fatigue behaviour of A357-T6 cast aluminium alloy
Source abstract
Abstract
Abstract The influence of internal casting defects on the fatigue properties of A357-T6 alloy has been studied. Specimens with artificial casting defects ( ∅ eq ≈ 2 mm) placed at the surface or in the bulk have been produced. A reference S–N curve has been obtained for the material containing only natural defects (microshrinkages). Cycling has been performed in air or under vacuum. In spite of their relatively large size, the internal artificial defects do not induce a reduction of the fatigue life compared to the reference material. When the artificial defects are placed at the surface, a decrease is observed when the specimens are cycled in air but it disappears again when cycling is performed in vacuum conditions. The detrimental effect of the casting defects is discussed in relation to their ability to initiate a crack growing in vacuum or not. It can be concluded that the increased fatigue lives observed for internal defects are the consequence of slower crack initiation and propagation mechanism occurring in vacuum.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Fatigue and fracture mechanics · Aluminum Alloys Composites Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. Casting defects and the fatigue behaviour of an aluminium casting alloy10.1111/j.1460-2695.1990.tb00594.x ↗
2. Ødegård J, Pedersen K. Fatigue properties of an A356 (AlSi7Mg) aluminium alloy for automotive applications – fatigue life prediction, SAE InternationalTechnical Paper 940811. http://dx.doi.org/10.4271/940811.10.4271/940811 ↗
3. Fatigue performance of a cast aluminium alloy Al–7Si–Mg with surface defects10.1023/A:1004560510632 ↗
4. Effect of solidification cooling rate on the fatigue life of A356.2-T6 cast aluminium alloy10.1046/j.1460-2695.2000.00299.x ↗
5. Fatigue behavior of A356-T6 aluminum cast alloys. Part I. Effect of casting defects10.1016/S1471-5317(00)00008-0 ↗
6. 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 ↗
7. Effect of microstructure on fatigue behaviour of cast Al–7Si–Mg alloy10.1179/026708301101510023 ↗
8. Scatter in fatigue life due to effects of porosity in cast A356-T6 aluminum–silicon alloys10.1007/s11661-003-0153-6 ↗
9. The effect of porosity on the fatigue life of cast aluminium–silicon alloys10.1111/j.1460-2695.2004.00780.x ↗
10. Effect of casting imperfections on the fatigue life of 319-F and A356-T6 Al–Si casting alloys10.1016/j.msea.2007.03.112 ↗
11. Effect of friction stir processing on fatigue behavior of an investment cast Al–7Si–0.6Mg alloy10.1016/j.actamat.2009.10.015 ↗
12. In situ characterization of fatigue damage evolution in a cast al alloy via nonlinear ultrasonic measurements10.1016/j.actamat.2009.11.055 ↗
13. High cycle fatigue strength of permanent mold and rheocast aluminum 357 alloy10.1016/j.ijfatigue.2010.01.001 ↗
14. On the mechanism of fatigue failure in the superlong life regime (N>107 cycles). Part 1: influence of hydrogen trapped by inclusions10.1046/j.1460-2695.2000.00328.x ↗
15. Stepwise S–N curve and fish-eye failure in gigacycle fatigue10.1046/j.1460-2695.1999.00206.x ↗
16. Demonstration of an endurance limit in cast 319 aluminum10.1007/s11661-003-0206-x ↗
17. A probabilistic model of fatigue strength controlled by porosity population in a 319-type cast aluminum alloy: Part I. Model development10.1007/s11661-006-9070-9 ↗
18. Support for an environmental effect on fatigue mechanisms in the long life regime10.1016/j.ijfatigue.2004.01.005 ↗
19. Observation of micromechanisms of fatigue crack propagation in 2024 aluminium
20. Mechanisms of formation of ductile fatigue striations
21. Stage II intrinsic fatigue crack propagation10.1016/0956-716X(91)90139-R ↗
22. Influence of environment on small fatigue crack growth
23. Petit J, Henaff G, Sarrazin-Baudoux C. Mechanisms and modeling of near-threshold fatigue crack propagation. In: Newman JC, Piascik RS. editors., Fatigue crack growth thresholds, endurance limits and design, ASTM STP 1372; 2000, pp. 3–30.10.1520/STP13423S ↗
24. Some critical aspects of low rate fatigue crack propagation in metallic materials10.1016/j.ijfatigue.2009.10.013 ↗
25. Recent progress in understanding environment assisted fatigue crack growth10.1007/BF00053522 ↗
26. On fatigue crack propagation enhancement by a gaseous atmosphere: experimental and theoretical aspects10.1016/0956-7151(95)00002-D ↗
27. A logical framework for the analysis of enhancement of fatigue crack propagation by the ambient atmosphere10.1007/BF02538900 ↗
28. 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 ↗
29. Serrano-Munoz I. Influence of casting defects on the fatigue behaviour of an A357-T6 aerospace alloy, Ph.D. thesis, INSA de Lyon (2014). .
30. ASM-International, Casting design and performance. Materials Park (OH): ASM International; 2009.
31. Quantitative evaluation of fatigue strength of metals containing various small defects or cracks10.1016/0013-7944(83)90018-8 ↗
32. Pluvinage · 2003
33. Fatigue and fatigue crack growth of aluminium alloys at very high numbers of cycles10.1016/S0142-1123(01)00167-0 ↗
34. Coupled influence of microstructure and atmosphere environment on fatigue crack path in new generation Al alloys10.1016/j.engfracmech.2010.04.027 ↗
35. Effects of pore position in depth on stress/strain concentration and fatigue crack initiation10.1007/s11661-011-0947-x ↗
36. A finite element10.1023/A:1016350528652 ↗