Home >> Surface Engineering, Volume 15, Number 5

New possibilities for controlling gas nitriding process by simulation of growth kinetics of nitride layers

Authors: Maldzinski, L.1; Liliental, W.1; Tymowski, G.1; Tacikowski, J.2

Source: Surface Engineering, Volume 15, Number 5, October 1999 , pp. 377-384(8)

Publisher: Maney Publishing

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Abstract:

This paper presents results of computerised simulations of the gas nitriding process, demonstrating the influence of the nitriding potential of NH3–H2 atmosphere on the composition and growth kinetics of ?? and ? nitride layers on pure iron. For the simulation, the recently developed KN–T phase diagram and growth kinetics models for both phases were utilised, as well as the latest results of experimental research. Simulation results indicate optimum possibilities of process control for the formation of layers of predictable phase composition, thickness of particular zones, and surface nitrogen concentrations. Also included are data on growth kinetics of the nitride layer (?/?? and ? zones) on alloy steels. The role of nitride forming and other alloying elements in process kinetics is discussed.

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708499101516740

Affiliations: 1: Nitrex Metal Inc., 3474 Poirier Boulevard, St Laurent, Quebec H4R 2J5, Canada 2: The Instytut Mechaniki Precyzyjnej, ul. Duchnicka 3, 00–967 Warszawa, Skr. poczt. 17, Poland

Publication date: 1999-10-01

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