Prediction of Carbon Partitioning and Austenite Stability via Non-equilibrium Thermodynamics in Quench and Partition (Q&P) Steel

Amit K. Behera*, G. B. Olson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Thermodynamics-based predictive modeling for phase characteristics after the quench and partition (Q&P) process is key to the design of new alloys and processing cycles with the best combination of mechanical properties. The austenite carbon content influences its phase stability during mechanical deformation and thus determines the improvement to total elongation from transformation-induced plasticity. The current article describes a carbon partition model based on para-equilibrium simulations with the addition of a temperature-dependent effective stored energy model that predicts carbon enrichment in austenite after Q&P processing. A retained austenite stability model is also proposed that uses the predicted carbon in austenite to quantify the austenite stability in terms of the Ms σ temperature. The developed models were calibrated and subsequently validated using measurements from advanced characterization techniques such as local electrode atom probe tomography, synchrotron-based x-ray diffraction and uniaxial tensile tests at varying test temperatures.

Original languageEnglish (US)
Pages (from-to)1375-1385
Number of pages11
JournalJOM
Volume71
Issue number4
DOIs
StatePublished - Apr 15 2019

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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