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High Nitrogen Concentration in Fe-Cr-Ni Alloys

Published online by Cambridge University Press:  15 February 2011

James C. Rawers ,
Nev A. Gokcen  and
Robert D. Pehlke
James C. Rawers
Affiliation:
U.S. Bureau of Mines, 1450 Queen Avenue, SW, Albany OR 97321.
Nev A. Gokcen
Affiliation:
U.S. Bureau of Mines, 1450 Queen Avenue, SW, Albany OR 97321.
Robert D. Pehlke
Affiliation:
University of Michigan, Dept. Materials Science, Univ. Michigan, Ann Arbor MI, 48104.
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Abstract

Increasing the nitrogen concentration in iron and iron alloys significantly improves their mechanical properties. A recent technique for melting in a hot-isostatic pressure furnace using nitrogen as the pressurizing gas has been developed by U.S. Bureau of Mines researchers for making massive nitrogen additions to iron (up to 1.6 weight percent nitrogen) and iron-chromium-nickel alloys (up to 6.6 weight percent nitrogen). The total nitrogen concentration measured at atmospheric pressure and room temperature was determined to be the equilibrium nitrogen concentration in the molten alloy. Statistical correlations were derived to explain the effects of melt pressure and alloy composition on the resulting nitrogen concentration. Nitrogen concentrations measured in solidified alloys made by high pressure melting techniques at lower pressures are consistent with previous published data. Computer generated phase diagrams for high nitrogen-chromium concentrations are also consistent with nitride microstructure observed after high-pressure melting. Extension of existing atmospheric nitrogen concentration data to higher pressure nitrogen concentrations shows Sievert's law (nitrogen concentration is proportional to the square root of the nitrogen melt pressure) to be valid for pure iron. However, substantial deviations from Sievert's law are observed for higher alloy compositions. Statistical fits of thermodynamic concentration data to the high-pressure melt nitrogen data requires evaluating element concentration terms, interaction effect terms, pressure terms, and pressure-composition effects terms. Examination of the nitrogen concentration data suggests several methods of correlation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 251: Symposium S – Pressure Effects on Materials Processing and Design , 1991 , 71
Copyright
Copyright © Materials Research Society 1992

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