Paper Title:
Phase-Field Modelling of Spinodal Decomposition during Ageing and Heating
  Abstract

Despite the tremendous success of phase-field (PF) modelling in predicting many of the experimentally observed microstructures in solids, additional progress is required in order to apply it to predict microstructure evolution in real alloy systems. One way to achieve this is to couple thermodynamic and kinetic databases with PF model. In this work, we present phase-field simulations of spinodal decomposition in Fe-Cr alloy during thermal ageing and anisothermal heating. In the PF method, the local free energy is directly constructed using the CALPHAD method. During isothermal ageing, the morphology of decomposed phases consisted in an interconnected irregular shape for short ageing times, and a further ageing caused the change to a droplet like shape of the decomposed Cr-rich phase. The influence of heating rate on phase transformations is then simulated and compared with experimental results obtained by differential thermal analysis, carried out with heating rates in the range 0.5 °C.min-1 to 15 °C.min-1. The simulation results show that heating rate strongly influences the microstructure morphology.

  Info
Periodical
Solid State Phenomena (Volumes 172-174)
Edited by
Yves Bréchet, Emmanuel Clouet, Alexis Deschamps, Alphonse Finel and Frédéric Soisson
Pages
1072-1077
DOI
10.4028/www.scientific.net/SSP.172-174.1072
Citation
N. Lecoq, J. Lacaze, F. Danoix, R. Patte, "Phase-Field Modelling of Spinodal Decomposition during Ageing and Heating", Solid State Phenomena, Vols. 172-174, pp. 1072-1077, 2011
Online since
June 2011
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$32.00
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