Phase Transformations in ε-/γ'-Iron Nitride Compound Layers in the Temperature Range of 613 K - 693 K

Tatiana Liapina; Andreas Leineweber; Eric Jan Mittemeijer

doi:10.4028/www.scientific.net/DDF.237-240.1147

Paper Titles

Nitrogen-Induced Formation of Nano-Structured Precipitations in the Ti-W-C-N System
p.1121

Mechanisms of Diffusion and Dissociation of E-Centers in Silicon
p.1129

MD Simulation Study of B1-B2 Phase Transition of KCl under High Pressure: Effects of Defects
p.1135

Auger Electron Spectroscopical Investigation of Interfacial Segregation in the Cu-Bi System
p.1141

Phase Transformations in ε-/γ'-Iron Nitride Compound Layers in the Temperature Range of 613 K - 693 K
p.1147

Characterization of TiAlSi Coating Deposited by Arc-PVD Method on TiAlCrNb Intermetallic Base Alloy
p.1153

Refinement in the Mathematical and Numerical Treatment of the Internal Oxidation of Alloys
p.1157

In Situ Observation of Electromigration in Gold Nanowires
p.1163

Monte Carlo Simulation of Diffusion with Uniform Sinks and Sources for Vacancies
p.1168

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Phase Transformations in ε-/γ'-Iron Nitride Compound Layers in the Temperature Range of 613 K - 693 K

Abstract:

ε/γ'-iron nitride (ε-Fe3N1+x, γ'-Fe4N) compound layers with thicknesses of about 10 µm were grown on pure α-Fe by gas nitriding at 823 K followed by quenching and were annealed at different temperatures in the range of 613 K – 693 K for different periods of time. These heat treatments led to a redistribution of nitrogen within the compound layer as well as between the compound layer and the adjacent ferrite, inducing thickness changes of the ε- and γ'-layers. The changes were analysed by light microscopy, electron probe microanalysis and X-ray diffraction. Models to describe and interpret the phase transformations in the ε/γ'-iron nitride compound layers as a function of time and temperature are discussed.