Solubility of nitrogen in ferrite; the Fe–N phase diagram

Autor:	Sai Ramudu Meka, Eric J. Mittemeijer, Bastian Rheingans, Jendrik Stein, R. E. Schacherl, Minsu Jung
Rok vydání:	2013
Předmět:	Materials science Diagram Beta ferrite Metals and Alloys chemistry.chemical_element Thermodynamics Condensed Matter Physics Nitrogen Local equilibrium chemistry Ferrite (iron) Phase (matter) Materials Chemistry Physical and Theoretical Chemistry Solubility Phase diagram
Zdroj:	International Journal of Materials Research. 104:1053-1065
ISSN:	2195-8556 1862-5282
DOI:	10.3139/146.110968
Popis:	To accurately define important phase boundaries in the iron–nitrogen (temperature–composition) phase diagram as well as the (temperature–potential) Lehrer diagram, the solubility of nitrogen in ferrite was determined as a function of the nitriding potential (which defines the chemical potential of nitrogen) and the temperature. To this end, thin iron foils were homogeneously nitrided in flowing gas mixtures composed of ammonia and hydrogen. Phase identification was performed by means of X-ray diffraction analysis. Further, from the data obtained, the absorption function and the enthalpy for dissolution of nitrogen into ferrite and the enthalpy of the reaction occurring at the α/(α + γ′)-phase boundary were determined. The data obtained were corrected for the occurrence of a stationary state instead of a local equilibrium at the surface of the specimens. It followed that parts of the phase boundaries in the Lehrer diagram do not represent equilibrium states but rather stationary states.
Databáze:	OpenAIRE
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