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| ANELASTIC RELAXATION, CYCLIC CREEP AND STRESS RUPTURE OF PARTICLE STRENGTHENED SUPERALLOYS |
| by ZHUANG Yi (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) (Manuscript received 14 April; 1982) |
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Cite this article:
by ZHUANG Yi (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) (Manuscript received 14 April; 1982). ANELASTIC RELAXATION, CYCLIC CREEP AND STRESS RUPTURE OF PARTICLE STRENGTHENED SUPERALLOYS. Acta Metall Sin, 1983, 19(4): 26-38.
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Abstract The cyclic creep and stress rupture behaviour of two representative particle strengthcncd alloys, an oxide dispersion strengthened nickel-base alloy and a nickel-base supcralloy strengthened by γ' precipitates, has been studied. It was found that the minimum creep rate decreases with increasing frcquency and the rupture life generally increases with increasing frequency in the load cycled and the frequency range of 0.05-6 cycles/h at 760℃. For the supcraIloy strengthened by γ' precipitates, however, the rupture lives decreased at the highest frequencies used, apparently due to frequency induced increase in degree of planar slip.An analysis was made of the plastic and anelastic strains that occur during the on-load and off-load periods, and of dislocation structures during cyclic creep. The observed behaviour and thc apparent material strengthening during cyclic loading was found not to bc attributable to a cyclic strain hardening effect but rather to the effects of anclastic strain that is accumulated during the on-load period and recovered during the off-load period. Using a phenomenological model based on the anelastic mechanism, a cyclic creep deceleration or creep/fatigue deceleration factor was derived. It shows reasonable agreement with the expcrimentally observed behaviour.
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Received: 18 April 1983
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