Nitriding of High Speed Steel for Improvement of Tools Resistance

The article is devoted to the study of the gas nitriding process, which makes it possible to obtain high-quality diffusion layers in high-speed steel M2 on the basis of an internal nitriding zone without a brittle nitride zone. The results of studies of the nitrided steel phase composition with a change of the saturating atmosphere during dilution of ammonia by hydrogen are presented. An increase in the resistance of the nitrided tool when drilling structural steel is shown, which is associated with the dispersion hardening of the internal nitriding zone with tungsten nitrides.

Investigation of the Fine Structure of 5 VMC Niobium Alloy Samples After Internal Nitriding

The paper considers the possibility of studying the fine structure of samples made of niobium alloy 5 VMC (grade 5B2MC-2), which underwent internal nitriding by X-ray diffraction analysis.The calculation of the dislocation density, which represents one of the parameters of the fine structure using various techniques, is shown. Its influence on the possible modes of internal nitriding is considered.

Investigation of the nitride phase in a heat-resistant alloy of the Ni – Co – W – Ti system, hardened by internal nitration

In a high-temperature alloy of the Ni – Co – Cr – W – Ti system grade VZh171, using X-ray spectral analysis, scanning and transmission electron microscopy, the composition of the particles of the hardening phase — nitrides after internal nitriding and subsequent heat treatment was studied. It was found that the particles differ on it chemical composition: the main constituent element, titanium or chromium, is proportionally replaced by other alloy components. The nitride compositions near the surface and in the center of the sample differ in the titanium to chromium ratio. After annealing, this difference is smaller, and the chromium content also decreases. It was found that the nitrides formed during nitriding are compounds in which the main forming element, titanium or chromium, is proportionally replaced by other alloy components. The nitride compositions near the surface and in the center of the sample differ in the titanium to chromium ratio. After annealing, this difference is smaller, and the chromium content also decreases.