Metallurgical and Materials Transactions A

, Volume 33, Issue 8, pp 2593–2598

Low-temperature extension of the lehrer diagram and the iron-nitrogen phase diagram

  • E. H. Du Marchie van Voorthuysen
  • D. O. Boerma
  • N. C. Chechenin
Article

DOI: 10.1007/s11661-002-0380-2

Cite this article as:
van Voorthuysen, E.H.D.M., Boerma, D.O. & Chechenin, N.C. Metall and Mat Trans A (2002) 33: 2593. doi:10.1007/s11661-002-0380-2

Abstract

Iron layers are nitrided in mixtures of ammonia and hydrogen at low temperatures, using a thin nickel caplayer as a catalyst. In the coordinate field of inverse temperature vs nitriding potential, we determined the boundaries between areas in which the α, γ′, or ε phases are in thermal equilibrium. Using these data, the Fe-N phase diagram is extended from 350 °C to 240 °C and extrapolated down to 200 °C. The α, γ′, and ε phases probably coexist in a triple point in the Lehrer diagram around 214 °C.

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2002

Authors and Affiliations

  • E. H. Du Marchie van Voorthuysen
    • 1
  • D. O. Boerma
    • 1
  • N. C. Chechenin
    • 1
    • 2
  1. 1.the Research Group Nuclear Solid State Physics, Materials Science Center MSCUniversity of GroningenGroningenThe Netherlands
  2. 2.the Institute of Nuclear PhysicsMoscow State UniversityMoscowRussia