Abstract
We analyzed the growth-rate diagrams for fatigue cracks in the modifications of a cermet alloy of the Ti–Si system in the initial state (the casted alloy) and after thermomechanical treatment. We used beam-like specimens tested under conditions of three-point bending in a corrosive medium (a 3% NaCl aqueous solution). It is established that, for various stress ratios, the parameter K max is more suitable for the description of changes in the growth rate of a fatigue macrocrack in the high-amplitude section of the diagrams than the parameter ΔK. Thermomechanically deformed metal ceramics are more sensitive to the effect of a corrosive medium than a casted alloy. The adverse influence of the medium increases with increase in the range of the stress intensity factor, which distinguishes the behavior of a preliminarily deformed cermet from that of traditional structurally homogeneous metal alloys.
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Vasyliv, B.D., Ivasyshyn, A.D., Ostash, O.P. et al. Kinetics of Corrosion-Fatigue Cracks in Ti–Si Cermet Composite. Materials Science 38, 220–224 (2002). https://doi.org/10.1023/A:1020990103898
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DOI: https://doi.org/10.1023/A:1020990103898