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Assessment of the Phase Equilibria among γ-Fe/ Fe2Nb/ Ni3Nb Phases in Fe-Ni-Nb Ternary System at Elevated Temperatures

Published online by Cambridge University Press:  15 March 2011

Y. Hasebe ,
K. Hashimoto ,
T. Matsuo  and
M. Takeyama
Y. Hasebe
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Japan
K. Hashimoto
Affiliation:
Materials Design Technology Co., Tokyo, Japan
T. Matsuo
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Japan Consortium of the Japan Research and Development Center for Metals (JRCM), Tokyo, Japan
M. Takeyama
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Japan Consortium of the Japan Research and Development Center for Metals (JRCM), Tokyo, Japan
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Abstract

Phase equilibria among γ-Fe, ε-Fe2Nb Laves and δ-Ni3Nb phases in Fe-Ni-Nb ternary system at 1473 K and 1373 K were experimentally examined, and also assessed by calculation in order to calculate the phase equilibria among these phases at 973 K. A ternary compound with hP24 structure with its limited composition range of Fe-21.5Nb- (56.8-59.8) Ni exists between Fe2Nb and Ni3Nb phase regions at both temperatures. Including the hP24 phase, the calculated isotherms at both temperatures are in good agreement with experimental ones. By using the optimized interaction parameters among the three elements in each phase, the isothermal section calculated at 973 K revealed a γ-Fe+ Fe2Nb + Ni3Nb three-phase coexisting region extended to Fe-rich composition of 80 at. % Fe. This suggests a possibility to develop austenitic heatresistant steels strengthened by both intermetallics phases.

Keywords

phase equilibriasteelmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n05-07
Copyright
Copyright © Materials Research Society 2011

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References

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