Effect of the Nitrogen Diffusion Layer Formed by Gas Blow Induction Heating Nitriding on Wear Resistance and Fatigue Properties of Titanium Alloy

Abstract

Abstract:The effect of the nitrogen diffusion layer formed by gas blow induction heating nitriding on the wear resistance and the fatigue properties of a titanium alloy was investigated. The nitrogen diffusion layer deteriorated the wear resistance of a titanium alloy. This is probably because hard abrasive particles worn from the diffusion layer accelerates the wear of the material. In contrast, the diffusion layer improved the fatigue properties of a titanium alloy. This is due to the high hardness of the diffusion layer, and because the layer and the substrate share the same elastic modulus, the surface stress concentration is inhibited.

Equipment and Technology for Combined Ion–Plasma Strengthening of Cutting Tools

“…This prevents plastic and elastic deformations of the tool surface as well as brittle rupture of the deposited coating [8][9][10]. The combined strengthening of cutting tools based on the vacuum arc, which includes pre-nitriding and deposition of the wear-resistant coating, can be carried out in the same vacuum chamber [11,12]. The tools are immersed in nitrogen plasma and heated up to an effective temperature of thermodiffusion 500-800 • C by ions accelerated from the plasma by a negative bias voltage applied to the tools.…”