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2 Journal of Achievements in Materials and Manufacturing Engineering

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Forecast the formation of nitrides on the surface of titanium alloys during nitriding in a glow discharge

Pastukh I. M., Mashovets N. S., Shalapko Y. I., Kurskaja V. A.

Journal of Achievements in Materials and Manufacturing Engineering

2014

Vol. 62, nr 2

53--62

Purpose: This article is devoted to methods for predicting the results of surface modification of titanium alloys in glow discharge nitriding. With this advantage, it is given to the analytical criteria as the most appropriate for design automation of processes processing. Design/methodology/approach: The methodology is the position that the nitriding process is a combination of several competing processes leading to the formation of both nitrides, nitrogen diffusion into the depth of the surface and to spray it. The main principle of assessing the intensity of each of them is that each elementary process is the most successful in the case when it created for optimal energy conditions. Findings: Developed a system of analytical criteria - relative energy factors, which qualitatively and adequately reflect the real processes of nitriding of titanium alloys in a glow discharge. Compliance with these indicators were tested in experimental treatment of samples resulting in an energy generating process model. Practical implications: The results were primarily used for computer-aided design modification processes, the optimal choice of the technological nitriding mode, the basis for the software control systems equipment for the processing of titanium alloys. Originality/value: The proposed energy model for the nitriding process in a glow discharge has no current analogues in the world.

Behaviour of nitriding layers for condition of small amplitude fretting

Drapak G. M., Shalapko Y. I., Mashovets N. S., Radek N.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 20, nr 1-2

243-246

Purpose: It was explored fretting resistance titanic alloy VT3-1 (Ti-Al6-Cr2-Mo2,5) after low temperature ionic nitriding in unhydrogen environment. Design/methodology/approach: Small amplitude fretting was initiated by the dynamic contact of ball and flat in the regime of the partial slip on edge of spot of contact. A method differs by simplicity and express determination of fretting resistance, namely areas of destruction by action of fretting for part nominally fixed contact - how the functions of cycles of loading. Findings: As a result of fretting the central region of sticking decreasing, and the edge of areas of fretting are increasing. Practical implications: The method of initiation of small amplitude fretting within bounds of preliminary displacement is offered. On the offered method the destruction of titanic alloys is explored at fretting and influencing of ionic nitriding on fretting. By a computation method the work of forces of friction in the area of wear, which in 5..6 times is less for nitriding titanic alloys, is appraised. Originality/value: A method allows defining reactionary power of nitriding layers for small amplitude fretting.