Corrosion fatigue is an important topic in the evaluation of the structural integrity of railway axles. In fact, several recent axle failures have been attributed to the presence of corrosion pits and axle surface corrosion. Despite the importance of this issue, existing EN standards do not precisely quantify the effect that corrosion or corrosion-fatigue might have on the fatigue strength of a railway axle. Consequently, there is a need to have a better understanding of this problem.
In this paper, two main lines of research have been adopted with a view to investigating the issues regarding the corrosion fatigue properties of AlN steel. The first line of research assesses the morphology and the statistical distribution of corrosion defects present on the surface of retired axles together with the detrimental effect of the defects detected on the in-air fatigue strength of AlN steel. The second line of research examines the fatigue properties of AlN steel in the presence of artificial rainwater. The results of the analysis show that the corrosion typically found on axles is significant from a point of view of fatigue properties and that the fatigue life of AlN steel is strongly affected by the presence of a mildly corrosive substance like rainwater. Fatigue test results are consistent with the fatigue strength reduction outlined in the BASS technical recommendations.
SnellJ. R.Key issues in the application of unified railway axle standards. Proc. Instn Mech. Engrs, Part F:J. Rail and Rapid Transit,2004, 218, 279–282.
2.
BerettaS.GhidiniA.LombardoF.Fracture mechanics and scale effects in the fatigue of railway axles. Eng. Fract. Mech., 2005, 72, 195–208.
3.
ZerbstU.VormwaldM.AnderschC.MädlerK.PfuffM.The development of a damage tolerance concept for railway components and its demonstration for a railway axle. Eng. Fract. Mech., 2005, 72, 209–239.
4.
HoddinottD. S.Railway axle failure investigations and fatigue crack growth monitoring of an axle. Proc. Instn Mech. Engrs, Part F:J. Rail and Rapid Transit,2004, 218, 283–292.
5.
Transportation Safety Board of Canada. Main track derailment: Canadian national train no. G-894-31-14. Railway Investigation Report R01Q0010, 2001.
6.
AkidR.MillerK. J.Short fatigue crack growth behaviour of a low carbon steel under corrosion fatigue conditions. Fatigue Fract. Eng. Mater. Struct., 1991, 14, 637–649.
7.
MillerK. J.Material science perspective of metal fatigue resistance. Mat. Sci. Technol., 1993, 9, 453–462.
8.
SchijveJ.Fatigue of structures and materials, 2004 (Kluwer Academic Publishers, New York, USA).
9.
RagabA.AlawiH.SoreinK.Corrosion fatigue of steel in various aqueous environments. Fatigue Fract. Eng. Mater. Struct., 1989, 12, 469–479.
10.
BR BASS 503. Design guide for the calculation of stresses in driving axles. Railway Companies of 1996, Issue C, 1996.
11.
BR BASS 504. Design guide for the calculation of stresses in non-driving axles. Railway Companies of 1996, Issue C, 1996.
LonsdaleC. P.StoneD. H.North American axle failure experience. Proc. Instn Mech. Engrs, Part F:J. Rail and Rapid Transit,2004, 218, 293–298.
17.
KowakaM.Introduction to life prediction of industrial plant materials: application of the extreme value statistical method for corrosion analysis, 1994 (Allerton Press, Inc., New York).
18.
ESIS P11-02. Technical recommendations for the extreme value analysis of data on large nonmetallic inclusions in steels. European Structural Integrity Society, 2002.
19.
ASTM 2283-03. Practice for extreme value analysis of nonmetallic inclusions in steel and other microstructural features. American Society for Testing of Materials, 2003.
20.
ColesS.An introduction to statistical modelling of extreme values, 2001 (Springer-Verlag, London, UK).
21.
MurakamiY.Analysis of stress intensity factors of modes I, II, and III for inclined surface cracks of arbitrary shape. Eng. Fract. Mech.1985, 22, 101–114.
22.
MurakamiY.EndoM.Effects of Defects, Inclusions and inhomogeneities on fatigue strength. Int. J. Fatigue1994, 16, 163–182.
23.
ZhouS.TurnbullA.Influence of pitting on the fatigue life of a turbine blade steel. Fatigue Fract. Eng. Mater. Struct., 1999, 22, 1083–1093.
24.
DolleyE. J.LeeB.WeiR. P.The effect of pitting corrosion on fatigue life. Fatigue Fract. Eng. Mater. Struct., 2000, 23, 555–560.
25.
MurakamiY.ToriyamaT.CoudertE. M.Instructions for a new method of inclusion rating and correlation with the fatigue limit. J. Test. Eval., 1994, 22, 318–326.
26.
BerettaS.CarboniM.CantiniS.GhidiniA.Application of fatigue crack growth algorithms to railway axles and comparison of two steel grades. Proc. Instn Mech. Engrs, Part F:J. Rail and Rapid Transit2004, 218, 317–326.
27.
KitagawaH.TakahashiS.Application of fracture mechanics to very small cracks or the cracks in the early stage. In Proceedings of the 2nd International Conference on Mechanical Behaviour of Materials, Boston, 1976, pp. 627–631.
28.
MurakamiY.Metal fatigue: effects of small defects and nonmetallic inclusions, 2002 (Elsevier, Oxford).
29.
BerettaS.Propagation of short cracks in a high strength steel for railway axles. In Proceedings of the 14th European Conference on Fracture, Krakow, Poland, 2002, pp. 217–224.
30.
El-HaddadM. H.SmithK. N.TopperT. H.Fatigue crack propagation of short crack. ASME Trans. J. Eng. Mater. Technol., 1979, 101, 42–46.
31.
ChenY. Y.TzengH. J.WeiL. I.WangL. H.OungJ. C.ShihH. C.Corrosion resistance and mechanical properties of low alloy steels under atmospheric conditions. Corros. Sci., 2005, 47, 1001–1021.
32.
BrunoroG.FrignaniA.ColledanA.ChiavariC.Organic films for protection of copper and bronze against acid rain corrosion. Corros. Sci., 2003, 45, 2219–2231.
33.
IshiharaS.SakaS.NanZ.Y.GoshimaT.SunadaS.Prediction of corrosion fatigue lives of aluminium alloy on the basis of corrosion pit growth law. Fatigue Fract. Eng. Mater. Struct., 2006, 29, 472–480.
34.
ASTM E739–91. Practice for statistical analysis of linear or linearized stress-life (S-N) and strain-life (-N) fatigue data. Amer. Soc. Test. Mater., 1991, 3(1), 645–651.
35.
FisherG.GrubisicV.Bemessung von Radsatzwellen - Einflussgrssen und Vorgehen bei der Auslegung. Bericht FB-226, LBF, Darmstadt, 2005.
36.
BerettaS.MurakamiY.Statistical analysis of defects for fatigue strength prediction and quality control of materials. Fatigue Fract. Eng Mater. Struct., 1998, 21, 1049–1065.
37.
MurakamiY.BerettaS.Small defects and inhomogeneities in fatigue strength: Experiments, models and statistical implications. Extremes,1999, 2, 1–25.
38.
BerettaS.AndersonC.MurakamiY.Extreme value models for the assessment of steels containing multiple types of inclusion. Acta Materialia,2006, 54, 2277–2289.
