The Effect of Deformation on Structure and Properties of Surface Diffusion Layers Formed in Iron Alloys under Alloying by Nitrogen and Carbon

A new method of gas nitriding is presented, which produces obtaining high-quality diffusion layers that meet the requirements of the use for various purposes, including aviation ones. Peculiar properties of highly alloyed martensitic steel nitriding after stadial thermo-gas-cyclic nitrogenization under partially dissociated ammonia with air additives have been examined. The results of metallographic studies, diagnostic leach, tests for wear resistance, impact hardness and corrosion stability, depending on the test mode are presented.

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Structure and Properties of Nickel Aluminide Layers on INCONEL 100

Materials Science Forum ◽

10.4028/www.scientific.net/msf.636-637.1011 ◽

2010 ◽

Vol 636-637 ◽

pp. 1011-1018 ◽

Cited By ~ 3

Author(s):

R. Sitek ◽

H. Matysiak ◽

Julia Ferenc-Dominik ◽

Krzysztof Jan Kurzydlowski

Keyword(s):

Nickel Aluminide ◽

Chemical Vapour ◽

Microstructural Characterization ◽

Hydrogen Atmosphere ◽

Aluminium Chloride ◽

Structure And Properties ◽

X Ray Diffraction ◽

Diffusion Layers ◽

Scratch Tests

The paper presents the results of investigations into the structure and properties of Ni-Al diffusion layers produced on INCONEL 100 by Chemical Vapour Deposition (CVD). The process was carried out in aluminium chloride (AlCl3) mixed with hydrogen atmosphere. The as-deposited layers were subjected to thermal treatment in vacuum to optimize their adhesion, hardness and temperature-resistance. Microstructural characterization of the coatings was carried out by scanning electron microscopy (SEM) The chemical composition was measured via EDS and the phase content was investigated by X-ray diffraction XRD. The resistance to high temperature of the coatings at atmospheric pressure was tested by applying 24-hours cycles at 950 °C. Scratch-tests provided data on the microhardness and adhesion of the coatings. The results indicate that the layers produced on the INCONEL 100 exhibit a very good adhesion combined with exceptional corrosion resistance at high temperatures.

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The Fatigue Properties of Mild Steel with Surface Diffusion Coatings of Nickel-Iron and Nickel-Cobalt-Iron Alloys

Transactions of the IMF ◽

10.1080/00202967.1983.11870637 ◽

1983 ◽

Vol 61 (1) ◽

pp. 50-56

Author(s):

G.M.C. Lee ◽

W.J.D. Jones

Keyword(s):

Mild Steel ◽

Surface Diffusion ◽

Iron Alloys ◽

Fatigue Properties ◽

Nickel Iron ◽

Diffusion Coatings ◽

Nickel Cobalt ◽

Cobalt Iron

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The Effect of Plastic Deformation on Nitrogen Diffusion in α-Fe

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.309-310.155 ◽

2011 ◽

Vol 309-310 ◽

pp. 155-160

Author(s):

Lesya Demchenko ◽

Sergey I. Sidorenko

Keyword(s):

Electron Microscopy ◽

Plastic Deformation ◽

Surface Diffusion ◽

Nitrogen Diffusion ◽

X Ray ◽

Microhardness Test ◽

Preliminary Plastic Deformation ◽

Diffusion Layers ◽

Ammonia Medium

The surface diffusion layers formed in preliminary deformed (350 %) -Fe after nitriding at 853 K in ammonia medium were studied by means of metallography, electron microscopy, microhardness test and X-ray powder diffractometry. The preliminary plastic deformation (PPD) effects non-monotonously on the structure, microhardness and thickness of nitride - and -phases layers formed in -Fe. The narrow intervals of deformations of 3-8 % and 20-30 % were found in which the accelerated formation of nitride - and -phases occurs.

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