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Effect of the pressure in the gas-discharge chamber on the depth of nitrogen diffusion in titanium alloys

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Abstract

Among all the kinds of surface hardening of titanium alloys ion nitriding in a hydrogen-free medium is the most efficient and environmentally safe. The time of nitrogen saturation of titanium alloys by this method is 10–15 times shorter than in conventional nitriding. The acceleration of the diffusion of nitrogen under conditions of a glow discharge makes it possible to conduct the nitriding of (α+β)-titanium alloys at low temperatures that correspond to those of their aging, which had been impossible earlier. Diffusion saturation in ion surface impregnation is a multifactor process, which makes it controllable. One of the main controlling factors of ion nitriding is the pressure of the working gas. A study of the effect of the pressure in the gas-discharge chamber on the depth of nitrogen diffusion in titanium alloys (under conditions of stable existence of the glow discharge) made it possible to determine the dependence of the thickness of the layer and the specific power of the discharge on the nitrogen pressure and to determine the interrelation between the specific power and the saturating capacity of the gas medium.

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  1. T. A. Panaioti
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 32–35, September, 1998.

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Panaioti, T.A. Effect of the pressure in the gas-discharge chamber on the depth of nitrogen diffusion in titanium alloys. Met Sci Heat Treat 40, 381–384 (1998). https://doi.org/10.1007/BF02466245

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