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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.

Warstwa wierzchnia stopów tytanu OT4-1 i WT22 po azotowaniu w wyładowaniu jarzeniowym.

Sadurski K., Jeziorski L.

Inżynieria Materiałowa

2002

R. XXIII, nr 5

230-234

Artykuł prezentuje wyniki badań nad możliwościami obróbki cieplno-chemicznej tytanu i jego stopów przy temperaturze niższej od temperatury przemiany alotropowej. Ocenie poddano warstwy wierzchnie stopów OT4-1 (Ti-1Al-1Mn) i WT22 (Ti-6Al-5Mo-5V-1Cr-1Fe) uzyskane w wyniku azotowania w wyładowaniu jarzeniowym prądu stałego. Proces azotowania prowadzono przy temperaturach 793 i 843 K, ciśnieniu 1,5 i 0,5 hPa, w czasie 15 i 9 h w atmosferze złożonej z 87,5% obj. N2 oraz 12,5% obj. H2. Wstępną analizę warstwy wierzchniej wykonano w oparciu o badania mikrostruktury przeprowadzone na mikroskopie optycznym oraz skaningowym, wyniki pomiarów mikrotwardości oraz analizy rentgenograficznej. Uzyskano warstwy naazotowane o grubości warstwy wierzchniej sięgającej ponad 100 mikrometrów (stop WT22) oraz ze strefą azotków około 1,4 mikrometra (OT4-1).

This paper presents results of investigations on possibilities of thermomechanical treatment of titanium and its alloys at temperatures lower than allotropic transformation temperature. Surface layers of OT4-1 (Ti-1Al-1Mn) and WT22(Ti-6Al-5Mo-5V-1Cr-1Fe) alloys obtained as result of d.c. glow discharge nitriding were estimated. Nitriding processes were carried out at 793 and 843 K temperatures, 0,5 and 1,5 hPa pressures, for 9 and 15 h in 87,5%vol. N, plus 12,5% vol. H, atmosphere. Preliminary analysis of surface layers was performed on the basis of microstructure investigations conducted on the optical and scanning microscope, results of microhardness measurements and X-ray analysis. Obtained nitrided layers are characterized by surface layer thickness over 100 micrometers (WT22) and nitrides zone about 1,4 micrometer thick (OT4-1).