Conclusions
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1.
The very high residual compressive stresses that occur in the process of SPD lower the resistance to small plastic deformations during bending, and therefore the slight reduction of the residual stresses that occurs during postdeformation tempering leads to an increase of σprop and σT. This is evidently true for SPD samples with different structures (ferrite-pearlite, sorbite, bainite, martensite).
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2.
For sorbitic steels the resistance to small plastic deformations, work of crack propagation, microdistortion, and macrostresses after SPD and tempering change less than for steels with a martensitic structure. Thus, for steels with a sorbitic structure the increase of the fatigue strength during postdeformation tempering is negligible.
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3.
The increase in the fatigue strength of steels with a martensitic structure during tempering after SPD depends to a considerable extent on the changes in the substructure, especially the evenness and additional reduction of microdistortion (because of which the early manifestation of the microyield effect is prevented), and also the increase in the resistance to small plastic deformations due to the reduction of residual macrostresses.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 31–34, April, 1979.
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Balter, M.A., Kurits, E.A. & Lyubchenko, A.P. Effect of tempering after roller burnishing on the physicomechanical properties of steel. Met Sci Heat Treat 21, 282–286 (1979). https://doi.org/10.1007/BF00775109
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DOI: https://doi.org/10.1007/BF00775109