Structure-phase composition and properties of mechanically alloyed high-nitrogen powder steels

The structure and properties of the Fe-21% Cr-N and Fe-18% Cr-7% Ni-0.8% Mn-0.5% C-N powder systems mechanically alloyed in nitrogen atmosphere and steels sintered from the powders in dissociated ammonia at t = 1170°C have been investigated. The thermodynamic calculations of the phase compositions o...

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Bibliographic Details
Published in:Russian journal of non-ferrous metals 2012-07, Vol.53 (4), p.321-329
Main Authors: Antsiferov, V. N., Gorbachyov, I. I., Oglezneva, S. A., Popov, V. V.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Chromium
Materials Science
Mathematical analysis
Metallic Materials
Nonferrous metals
Phase composition
Powder Production Processes and Properties
Steels
Structural steels
Thermodynamics
Wear resistance
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Summary:The structure and properties of the Fe-21% Cr-N and Fe-18% Cr-7% Ni-0.8% Mn-0.5% C-N powder systems mechanically alloyed in nitrogen atmosphere and steels sintered from the powders in dissociated ammonia at t = 1170°C have been investigated. The thermodynamic calculations of the phase compositions of the steels are carried on the basis of searching the Gibbs integral energy minimum for the system. In comparing the obtained experimental data with the results of thermodynamic calculations for the Fe-Cr-C-N and Fe-Cr-N systems, it is found that the equilibrium phase composition is not reached. The resulted steels contain increased nitrogen quantity (1.6 to 2.1%) distributed in austenite and/or nitrides. The steels have high strength, wear and corrosion resistance.
ISSN:1067-8212
1934-970X
DOI:10.3103/S1067821212030030