Conclusions
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1.
Carbonitriding at 800°C and heat treatment of flat blades of supershears and guillotines from steel 40Kh with subsequent grinding of the faces to a specific depth provides self-sharpening of the blades in operation.
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2.
In order to provide a self-sharpening regime after the creation of the diffusion layer on the faces of a blade and a hardening heat treatment, a part of the layer of the “soft” face is ground off to a hardness much lower than that of the surface of the “hard” face.
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3.
The structural strength of the blades is provided by optimum regimes of carbonitriding, quenching; and double tempering and raising the toughness of the “soft” face by a partial removal of the surface “hard” layer.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 16–19, June, 1999.
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Karpov, L.P. Use of carbonitriding for self-sharpening of tools in service. Met Sci Heat Treat 41, 250–252 (1999). https://doi.org/10.1007/BF02468238
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DOI: https://doi.org/10.1007/BF02468238