A steel given HTMT and tempered at relatively low temperatures to produce a martensitic or martensitetroostite structure has improved fatigue strength, both in air and in corrosive media.
It has been established that the maximum increase in the fatigue strength of steel tempered at low temperatures corresponds to a certain optimum torsional strain during HTMT. For test pieces tested in a corrosive medium, this optimum strain is shifted toward higher values ofφ.
The decrease in the endurance limit at higher values ofφ can be attributed to more intense recrystallization of austenite deformed during HTMT and to the formation of products of non-martensitic transformations in quenched steel.
The beneficial effect of HTMT on the fatigue strength of steel is observed in tests on already corroded test pieces.
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G. V. Karpenko, Strength of Steel in a Corrosive Medium [in Russian], Mashgiz, 1963.
V. I. Pokhmur'skii and G. V. Karpenko, Dopovidi AN URSR, no. 12, 1963.
A. V. Ryabchenkov, Resistance of Steels to Corrosion Fatigue [in Russian], Mashgiz, 1953.
A. P. Gulyaev, “Austenite-Martensite transformation.” In: Heat Treatment of Metals [in Russian], Mashgiz, 1955.
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Pokhmur'skii, V.I., Karpenko, G.V. Effect of thermomechanical treatment at elevated temperatures on the fatigue strength of steel 45 in various working media. Mater Sci 1, 32–34 (1966). https://doi.org/10.1007/BF00714981
- Beneficial Effect
- Elevated Temperature