Solidification characteristics and segregation behavior of a P-containing Ni–Fe–Cr-based alloy

Solidification characteristics and segregation behavior of a P-containing Ni–Fe–Cr-based alloy Solidification characteristics and segregation behavior of a P-containing Ni–Fe–Cr-based alloy, considered as boiler and turbine materials in 700 °C advanced ultra-supercritical coal-fired power plants, have been investigated by differential thermal analysis and directional solidification quenching technique. Results reveal that P decreases the solidus temperature, but only has negligible influence on liquidus temperature. After P was added, the solidification sequence has no apparent change, but the width of the mushy zone increases and dendritic structures become coarser. Moreover, P increases the amount and changes the morphology of MC carbide. Energy-dispersive spectroscopy analysis reveals that P has obvious influence on the segregation behavior of the constitute elements with equilibrium partition coefficients ( $$k_{i}$$ k i ) far away from unity, whereas has negligible effect on the constituent elements with $$k_{i}$$ k i close to unity and has more influence on the final stage of solidification than at early stage. The distribution profiles reveal that P atoms pile up ahead of the solid/liquid (S/L) interface and strongly segregate to the interdendritic liquid region. The influence of P on solidification characteristics and segregation behavior of Ni–Fe–Cr-based alloy could be attributed to the accumulation of P ahead of the S/L interface during solidification. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Physics A: Materials Science Processing Springer Journals

Solidification characteristics and segregation behavior of a P-containing Ni–Fe–Cr-based alloy

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag GmbH Germany
Subject
Physics; Condensed Matter Physics; Optical and Electronic Materials; Nanotechnology; Characterization and Evaluation of Materials; Surfaces and Interfaces, Thin Films; Operating Procedures, Materials Treatment
ISSN
0947-8396
eISSN
1432-0630
D.O.I.
10.1007/s00339-017-1208-7
Publisher site
See Article on Publisher Site

Abstract

Solidification characteristics and segregation behavior of a P-containing Ni–Fe–Cr-based alloy, considered as boiler and turbine materials in 700 °C advanced ultra-supercritical coal-fired power plants, have been investigated by differential thermal analysis and directional solidification quenching technique. Results reveal that P decreases the solidus temperature, but only has negligible influence on liquidus temperature. After P was added, the solidification sequence has no apparent change, but the width of the mushy zone increases and dendritic structures become coarser. Moreover, P increases the amount and changes the morphology of MC carbide. Energy-dispersive spectroscopy analysis reveals that P has obvious influence on the segregation behavior of the constitute elements with equilibrium partition coefficients ( $$k_{i}$$ k i ) far away from unity, whereas has negligible effect on the constituent elements with $$k_{i}$$ k i close to unity and has more influence on the final stage of solidification than at early stage. The distribution profiles reveal that P atoms pile up ahead of the solid/liquid (S/L) interface and strongly segregate to the interdendritic liquid region. The influence of P on solidification characteristics and segregation behavior of Ni–Fe–Cr-based alloy could be attributed to the accumulation of P ahead of the S/L interface during solidification.

Journal

Applied Physics A: Materials Science ProcessingSpringer Journals

Published: Aug 20, 2017

References

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