Abstract
Fatigue experiments have been performed on a squeeze-cast Al-Si-Mg-Cu alloy as a function of precrack history. The precracked conditions were that the compact tension specimen was precracked with a relatively long through-thickness crack (about 6 mm) in air, in aqueous 3 pct NaCl solution, and in air followed by hydrogen precharging. It was found that a relatively long through-thickness crack can grow more rapidly than would be predicted by a traditional ΔK involving three stages under either a corrosion fatigue test after precracking in air or a hydrogen precharging experiment followed by fatigue testing in air. The experimental evidence confirms that a hydrogen-assisted damage mechanism is mainly responsible for the rapid growth phenomenon of a relatively long crack in a corrosive environment compared to the result of fatigue testing in air after hydrogen precharging. The amount of hydrogen production in chemical-microstructure interaction processes in a corrosion fatigue experiment and the effectiveness of hydrogen transport to the region ahead of the crack tip determine the degree of hydrogen-assisted fatigue crack growth, which is controlled by the microstructure of the alloy and the chemical attack on a sharp and fresh crack tip.
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References
K.J. Miller: Mater. Sci. Technol., 1993, vol. 9, pp. 453–62.
M.R. Bayoumi: Eng. Fract. Mech., 1993, vol. 45, pp. 297–307.
G.S. Chen and D.J. Duquette: Metall. Trans. A, 1992, vol. 23A, pp. 1563–72.
G.S. Chen and D.J. Duquette: Metall. Trans. A, 1992, vol. 23A, pp. 1551–62.
R.P. Wei, P.S. Pao, R.G. Hart, T.W. Weir, and G.W. Simmons: Metall. Trans. A, 1980, vol. 11A, pp. 151–58.
R.S. Piascik and R.P. Gangloff: Metall. Trans. A, 1991, vol. 22A, pp. 2415–28.
R.E. Ricker and D.J. Duquette: Metall. Trans. A, 1988, vol. 19A, pp. 1775–83.
R.S. Piascik and R.P. Gangloff: Metall. Trans. A, 1993, vol. 24A, pp. 2751–62.
J. Albrecht, I.M. Bernstein, and A.W. Thompson: Metall. Trans. A, 1982, vol. 13A, pp. 811–20.
N. Fat-Halla: J. Mater. Sci., 1989, vol. 24, pp. 2488–92.
O. Modi, M. Saxena, B. Prasad, A. Yegneswaran, and M. Yaidya: J. Mater. Sci., 1992, vol. 27, pp. 3897–3902.
K. Shiozawa, J. Mizutani, S. Nishino, and S. Ebata: 6th Int. Conf. on Mechanical Behaviour of Materials, Kyoto, Japan, 1991, pp. 427–32.
K. Shiozawa and S.M. Sun: Metall. Mater. Trans. A, 1995, vol. 26A, pp. 3049–51.
Z.X. Tong, S. Lin, and C.M. Hsiao: Metall. Trans. A, 1989, vol. 20A, pp. 921–24.
K.S. Chan: Metall. Trans. A, 1993, vol. 24A, pp. 2473–86.
S.M. Sun, K. Shiozawa, J.L. Gu, and N.P. Chen: Metall. Mater. Trans., 1995, vol. 26A, pp. 731–39.
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Shiozawa, K., Sun, S. Corrosion fatigue crack growth behavior of a squeeze-cast Al-Si-Mg-Cu alloy with different precrack histories. Metall Mater Trans A 28, 1471–1477 (1997). https://doi.org/10.1007/s11661-997-0209-0
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DOI: https://doi.org/10.1007/s11661-997-0209-0