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Abstract

An investigation was carried out on the propagation of cracks in coarse-grained bainitic 0·5 Cr-Mo-V material under both load- and displacement-controlled cyclic loading conditions. All tests were performed at 838 K using cyclic frequencies in the range 10⁻³–10⁻⁵ Hz. Crack initiation and propagation were found to occur as a result of the formation, growth, and linkage of grain-boundary creep cavities and wedge cracks, irrespective of cyclic frequency. Notch-tip creep displacements at crack initiation were comparable to those observed in statically loaded specimens, and time-dependent crack propagation rates also agreed well with data obtained in static tests. Time-dependent crack propagation rates were a function of the specimen displacement rates, suggesting that cavity growth occurred by either a plastic or a constrained-diffusion mechanism.

MST/56

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References

HALES

: Fatigue Eng. Mater. Struct., 1980, 3, (4), 339.

PRIEST and

R. H.

ELLISON

E. G.

: Mater. Sci. Eng., 1981, 49, 7.

PLUMBIUDGE

W. J.

, DEAN

M. S.

, and MILLER

D. A.

: Fatigue Eng. Mater. Struct., 1982, 5, (1), 101.

MILLER

D. A.

: Mater. Sci. Eng., 1982, 54, 273.

NEATE

G. J.

: in ‘Advances in life prediction methods’, 123–129; 1983, New York, American Society of Mechanical Engineers.

HAIGH

Jr. R.

and RICHARDS

C. E.

: in Proc. Int. Conf. on ‘Creep and fatigue in elevated temperature applications’, London, 1975, Institution of Mechanical Engineers, paper C159/73.

GOOCH

D. J.

and GRIMES

F. J.

: CEGB report RD/L/N29/74, Central Electricity. Research Laboratories, Leatherhead, 1974.

NEATE

G. J.

: unpublished work, Central Electricity Generating Board (Midlands Region), Nottingham.

SAXENA

and HUDAK

S. J.

: Int. J. Fract., 1978, 14, (5), 453.

10.

GOOCH

D. J.

and KING

B. L.

: in Proc. Int. Conf. on ‘Engineering aspects of creep’, London, 1980, Institution of Mechanical Engineers, paper C200/80.

11.

ARMSTRONG

: CEGB report MID/55D/84/0019/R/MT, Central Electricity Generating Board (Midlands Region), Nottingham, 1984.

12.

SMITH

D. J.

and WEBSTER

G. A.

: in Proc. Int. Conf. on ‘Mechanical behaviour of materials’, 315-322; 1983, Oxford, Pergamon.

13.

RIEDEL

: J. Mech. Phys. Solids, 1981, 29, 35–49.

14.

RIEDEL

and RICE

J. R.

: in ‘Fracture mechanics’, STP 700, 112-130; 1980, Philadelphia, Pa, American Society for Testing and Materials.

15.

AINSWORTH

R. A.

: Int. J. Fract., 1982, 20, 147–159.

16.

MUSICCO

G. G.

: Int. J. Fract., 1982, 19, R41.

17.

DYSON

B. F.

: Met. Sci., 1976, 10, (10), 349–353.

18.

CANE

B. J.

: Acta Metall., 1981, 29, 1581.

Crack growth in bainitic 0.5Cr–Mo–V steel under creep-fatigue conditions

Abstract

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