Conclusions
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1.
A change from creep at moderate temperatures to high-temperature creep is accompanied by equalization of the defect density Δρ/ρ in the volume and in surface layers of polycrystalline metals resulting from microdiscontinuities. In this case Δρ/ρ varies with the applied stress, while the character of accumulation of defects in the process of creep changes.
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2.
The characteristics of high-temperature creep of polycrystalline materials are evidently due to a considerable extent to the activation of healing of microcracks in presurface layers at elevated temperatures.
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Literature cited
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Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 24–26, December, 1980
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Betekhtin, V.I., Kadomtsev, A.G. & Petrov, A.I. Microfracture of metals during high-temperature creep. Met Sci Heat Treat 22, 879–881 (1980). https://doi.org/10.1007/BF00779396
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DOI: https://doi.org/10.1007/BF00779396