Abstract
1. The low-cycle fatigue limit in compression depends on the stress concentration coefficient and the asymmetry factor of the stress cycle. The effect of stress concentrations in reducing the low-cycle fatigue limit is greatest at values of Kt∼2. 2. With a stress concentration coefficient Kt>1.7, quenching and high-temperature tempering of tool steels results in a higher low-cycle fatigue limit than quenching and low-temperature tempering. With a low stress concentration coefficient (Kt≤1.7) the low-cycle fatigue strength is higher after low-temperature tempering. 3. Mechanicothermal treatment, consisting of compression after low-temperature tempering to martensite and subsequent aging at 160–200°C, raises the low-cycle fatigue limit if the steel retains some plasticity in the process of hardening after deformation.
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