Grain boundary oxidation and fatigue crack growth at elevated temperatures |
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Authors: | H.W. Liu Y. Oshida |
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Affiliation: | 3. Department of Civil Engineering, University of Zabol, Zabol, Iran |
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Abstract: | Fatigue crack growth rate at elevated temperatures can be accelerated by grain boundary oxidation. Grain boundary oxidation kinetics and statistical distribution of grain boundary oxide penetration depth were studied.At a constant ΔK-level and at a constant test temperature, fatigue crack growth rate, da/dN, is a function of cyclic frequency, ν. A fatigue crack growth model of intermittent micro-ruptures of grain boundary oxide is constructed. The model is consustent with the experimental observations that, in the low frequency region, da/dN is inversely proportional to ν, and fatigue crack growth is intergranular. |
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