In two WASPALOY specimens, the orientations of grains that initiated fatigue cracks and adjacent ograins were measured using electron backscattered diffraction patterns (EBSP). Crystallographic relationships were found for crack initiating regions that resulted in slip transmission across areas larger than the initiating grain, and the initiating grain was usually larger than average. A similar evaluation of control areas on each specimen found that there was much less likelihood of slip transmission across grain boundaries. Schmid factors (SFs) were also evaluated. It is concluded that the reason that fatigue cracks formed at these locations was due to the lower stress required for slip initiation in these clusters of grains oriented for slip transmission across grain boundaries. Many of the cracks initiated within grain boundaries. A detailed crystallographic analysis of the adjacent grains suggests criteria for intergranular (IG) crack initiation.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Lin M.-R., Fine M.E., Mura T. (1986) Acta Metall. 43: 619-28
Basinski Z.S., Basinski S.J. (1984) Scripta Metall. 18: 851-56
Davidson D.L., Campbell J.B. (1989) Metallography 22: 107-15
Suresh S. (1998) Fatigue in Materials 2nd ed. Cambridge University Press: Cambridge, United Kingdom, pp. 132-64
Petch N.J. (1953) J. Iron Steel Inst. 174, 25
Li J.C.M., Chou Y.T. (1970) Metall. Trans. 1: 1145-59
Brown C.W., King J.E., Hicks M.A. (1984) Metall. Sci. 18: 374-80
Kim W.H., Laird C. (1978) Acta Metall. 26: 789-99
P. Neumann and A. Tonnessen: Strength of Metals and Alloys, P.O. Kettenun et al., eds., Pergamon Press, Oxford, United Kingdom, 1988, vol. 1, pp. 743-48.
Randle V., Engler O. (2000) Introduction to Texture Analysis: Macrotexture, Microtexture and Orientation Mapping. Taylor and Francis, London
D. Cullity: Elements of X-ray Diffraction, Addison-Wesley, Reading MA, 1956, ch. 2, pp. 29-77.
Shen Z., Wagoner R.H., Clark W.A.T. (1988) Acta Metall. 36: 3231-42
Lee T.C., Robertson I.E., Birnbaum H.K. (1990) Metall. Trans. A 21A: 2437-46
Davis K.G., Teghtsoonian E., Lu A. (1966) Acta Metall. 14: 1677-84
Misra A., Gibala R. (1999) Metall. Mater. Trans. A, 30A: 991-1001
Mackenzie J.K. (1964) Acta Metall. 12: 223-25
M. Oja, K.S. Ravi Chandran, and R.G. Tryon: Acta Mater., in press.
Metals Handbook, ASM, Metals Park, OH, 1961, vol. 1, p. 485.
Zhao Y., Tryon R.G. (2004) Comp. Meth. Appl. Mech. Eng. 193: 3919-34
Toh S.-F., Rainforth W.M. (1996) Mater. Sci. Technol. 12: 1007-14
D. Hull and D.J. Bacon: Introduction to Dislocations, Butterworth-Heinemann, 2001, p. 97.
Author information
Authors and Affiliations
Corresponding author
Additional information
This article is based on a presentation given in the symposium entitled “Deformation and Fracture from Nano to Macro: A Symposium Honoring W.W. Gerberich’s 70th Birthday,” which occurred during the TMS Annual Meeting, March 12–16, 2006, in San Antonio, Texas, and was sponsored by the Mechanical Behavior of Materials and Nanomechanical Behavior Committees of TMS.
Rights and permissions
About this article
Cite this article
Davidson, D.L., Tryon, R.G., Oja, M. et al. Fatigue Crack Initiation In WASPALOY at 20 °C. Metall Mater Trans A 38, 2214–2225 (2007). https://doi.org/10.1007/s11661-007-9178-6
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11661-007-9178-6