Conclusions
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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.
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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.
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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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Literature Cited
E. Zhmikhorskii, “Fatigue strength of tool steels in compression,” Metal. i Term. Obrabotka Metal., No. 10 (1962).
D. A. Kal'ner et al., GOSINTI, No. 5-68-690/42, Moscow (1968).
H. Neuber, Stress Concentrations [Russian translation], Gostekhizdat, Moscow (1947).
N. N. Afanas'ev, Statistical Theory of Fatigue Strength of Metals [in Russian], Izd. AN UkrSSR (1953).
Additional information
Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 47–51, April, 1972.
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Smirnov, E.V., Pirusskii, M.V. The fatigue limit in compression of several tool steels. Met Sci Heat Treat 14, 334–336 (1972). https://doi.org/10.1007/BF00657024
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DOI: https://doi.org/10.1007/BF00657024