Abstract
The objective of this work is to evaluate the damage induced below and above the fatigue limit (Δσ t =360 MPa) in pressure vessel steels, such as SA508. Fatigue damage was induced in samples taken from an SA508 steel plate by various loading histories in order to examine the influence of prior cyclic loading below the fatigue limit. Cell-to-cell misorientation differences were measured by the selected area diffraction (SAD) method. Surface cracking was also studied by the replication method. Small cracks were observed after precycling both below and above the fatigue limit. It was, however, found that fatigue test bars had a longer lifetime after precycling below the fatigue limit, while precycling above the fatigue limit caused other specimens to fail even when subsequently cycled below the fatigue limit. Cell-to-cell misorientation usually increases with accumulation of fatigue damage, but it was found that the misorientations measured after precycling below the fatigue limit decreased again at the beginning of the subsequent cycling above the fatigue limit. It should be noted that the misorientation at failure was always about 4 to 5 deg, regardless of loading histories. Misorientation showed good correlation with the fatigue lifetime of the samples.
Similar content being viewed by others
References
Criteria of the ASME Boiler and Pressure Vessel Code for Design by Analysis in Section III and VIII, Division 2, ASME, Fairfield, NJ, pp. 1–23.
Y.G. Nakagawa, H. Yoshizawa, and M.E. Lapides:Metall. Trans. A, 1990, vol. 21A, pp. 1769–73.
C. Fukuoka, H. Yoshizawa, Y.G. Nakagawa, and M.E. Lapides:Metall. Trans. A, 1993, vol. 24A, pp. 2209–16.
M.E. Lapides, Y.G. Nakagawa, C. Fukuoka, and Y. Yoshida:The 1994 Pressure Vessels and Piping Conf., Minneapolis, MN, June 19–23, 1994, PVP-vol. 283, pp. 23–28.
C. Fukuoka and Y.G. Nakagawa:Scr. Metall., 1996, vol. 34, no. 9, pp. 1497–1502.
T. Mura and Y. Nakasone:J. Appl. Mech., 1990, vol. 57, pp. 1–6.
K.J. Miller:Fundamentals of Deformation and Fracture, Eshelby Memorial Symp. Sheffield, April 2–5, 1984, B.A. Bilby, K.J. Miller, and J.R. Willis, eds., University Press: Cambridge, pp. 477–99.
K.J. Miller:Fatigue Eng. Mater. Struct., 1982, vol. 5(3), pp. 223–32.
J.A. Bennett:Proc. Am. Soc. Test. Mater., 1946, vol. 46, pp. 693–714.
F.E. Richart and N.M. Newmark:Proc. Am. Soc. Test. Mater., 1948, vol. 48, pp. 767–800.
S.M. Marco and W.L. Starkey:Trans. Am. Soc. Mech. Eng., 1954, vol. 76, pp. 627–32.
M. Goto, H. Nishitani, Y. Yanagawa, and H. Miyagawa:Nihon Kikaigakkai Ronbunshyu, A, 1989, vol. 55 (511), pp. 453–59.
G.M. Sinclair:Proc. ASTM, 1952, vol. 52, pp. 743–58.
H. Nishitani and T. Ikenaga:Kikai no Kenkyuu (Res. Mech.), 1975, vol. 27(8), pp. 995–1000.
F.-L. Liang and C. Laird:Mater. Sci. Eng. A, 1989, vol. A117, pp. 103–13.
T.H. Courtney:Mechanical Behavior of Material, McGraw-Hill, New York, NY, pp. 570–80.
D. Kuhlmann-Wilsdorf and C. Laird:Mater. Sci. Eng., 1977, vol. 27, pp. 137–56.
D. Hull and D.J. Bacon:Introduction to Dislocations, 3rd ed., International Series on Materials Science and Technology, Pergamon Press, Elmsford, NY, vol. 37, pp. 189–96.
R.W. Hertzberg:Deformation and Fracture Mechanics of Engineering Materials, 3rd ed., John Wiley & Sons, Inc. p. 504.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fukuoka, C., Nakagawa, Y.G., Lance, J.J. et al. Conditioning monitoring by microstructural evaluation of cumulative fatigue damage. Metall Mater Trans A 27, 3841–3851 (1996). https://doi.org/10.1007/BF02595633
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02595633