Conclusions
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1.
Heavily loaded dies used for cold forging at very high specific pressures (300 kg/mm2) are best made of steels 2 and 4.
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2.
The heat treatment of parts working at high pressures should be conducted in such a way as to keep the residual austenite between 5–15% and the hardness not less than HRC 62.
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3.
Wear and tear is reduced when the tempering temperature is raised; the fatigue strength during compression (at high pressures) is sharply reduced at tempering between 200 and 500°.
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References
E. Zmihorski, “Prace Instytuton Mechaniki,” 1958, No. 24.
E. Zmihorski, “Stal szybkotnaca,” PWT, Warszawa, 1958.
E. Zmikhorski, “Prace Instytutu Mechaniki Precyzyinei,” 1960, No. 27.
E. Zmihorski, “Metal Treatment,” 1960, No. 175.
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Zmihorski, E. Fatigue strength during compression of tool steels. Met Sci Heat Treat 4, 424–426 (1962). https://doi.org/10.1007/BF00820031
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DOI: https://doi.org/10.1007/BF00820031