The growth rates of grain boundary cavities during slow–fast fatigue are calculated by assessing the rates of four growth mechanisms. It is shown that cavity growth can take place providing the strain rate during tension is below a critical value. Also at sufficiently low strain rates cavities can grow to a large size before the life of a fast–fast test is achieved. The paper suggests that a better understanding of cavity nucleation is desirable.
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References
1.
WARINGJ.: Metall. Trans. 1977, 8A, 711.
2.
WARINGJ., TOMKINSB., and SUMNERG.: in STP 520 ‘Fatigue at elevated temperatures’, (ed.CardenA. E., McEvilyA. J., and C.H.), 123; 1973, Philadelphia, Pa, American Society for Testing and Materials.
3.
SIDEYD., COLLINSA. L. W., and D. M. R. ‘minim in Proc. 3rd Int. Conf. on ‘Mechanical behaviour of materials’, (ed. MillerK. J. and SmithR. F.), 141; 1979, Oxford, Pergamon.
COFFINL. F.: in Proc. 2nd Int. Conf. on ‘Mechanical behaviour of materials’,866; 1976, Metals Park, Ohio, American Society for Metals.
6.
STROHA. N.: Adv. Phys., 1957, 6, 418.
7.
BEEREW.: in‘Cavities and cracks in creep and fatigue’, (ed.GittusJ.), 1; 1981, London, Applied Science.
8.
KNOWLESG.: to be published.
9.
BEEREW. and ROBERTSG.: Acta Metall., 1982, 30, 571.
10.
MILLERD.: personal communication.
11.
GOODSS. A and NIXW. D.: Acta Metall., 1978, 26, 739.
12.
DYSONB. F. and RODGERSM. J.: inProc. 4th Int. Conf. on ‘Fracture’, (ed. TaplinD. M. R.), Vol. 2, 621; 1977, Waterloo, Ontario, Canada, University of Waterloo Press.
13.
PAVINICHW. and RAJIt.: Metall. Trans., 1977, 8A, 1917.
14.
SMITHA. F. and GIBBSG. B.: Met. Sci., 1968, 2, 47.
