The high fatigue strength of N26KhT1 metastable austenitic steel is caused not only by strengthening as a result of phase strain hardening and aging but also by the instability of the Fe−Ni−Ti austenite.
An increase in grain size leads to a reduction in the fatigue limit of N26KhT1 and 40G18Yu3F steels. The fatigue limit of 40G18Yu3F stable dispersion hardening steel is more sensitive to a change in grain size.
The straight-line relationship of the fatigue strength of N26KhT1 and 40G18Yu3F steels to grain size, described by the Hall-Petch equation, has a break, which is caused by a change in the character of failure in the transition from the fine- to the coarse-grained condition of the steel.
The low-cycle fatigue strength of N26KhT1 steel is practically independent of grain size.
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Shchedrin, E.I., Sagaradze, V.V. & Malyshev, K.A. Influence of grain size and γ-phase stability on the fatigue limit of high-strength austenitic steels. Met Sci Heat Treat 23, 354–359 (1981). https://doi.org/10.1007/BF00700551
- Grain Size
- Strain Hardening
- Fatigue Strength