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Interface conditions during mixed-mode phase transformations in metals.

Richard M Huizenga1, Cornelis Bos1,2, Jilt Sietsma1

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Area of Science:

  • Materials Science and Engineering
  • Metallurgy
  • Computational Materials Science

Background:

  • Phase transformations, such as ferrite to austenite, are critical in determining the properties of low-carbon steels.
  • Understanding and modeling these transformations is essential for controlling material behavior during heat treatment.

Purpose of the Study:

  • To develop and validate a fast, three-dimensional computational model for ferrite to austenite phase transformation in low-carbon steel.
  • To investigate the influence of parent microstructure, nucleation, and growth kinetics on the transformation process.

Main Methods:

  • Formulation of a three-dimensional phase transformation model incorporating parent microstructure, nucleation, and growth.
  • Calculation of interface velocity using a mixed-mode growth model during the austenite transformation phase.
  • Comparison of simulated transformation kinetics with experimental data for an Fe-C-Mn steel under varying cooling rates.

Main Results:

  • The developed model effectively predicts the phase transformation kinetics of low-carbon steel.
  • The model demonstrates good agreement with experimental results across different cooling rates.
  • The mixed-mode growth character of the ferrite to austenite transformation was successfully identified and simulated.

Conclusions:

  • The computational model provides a reliable tool for simulating ferrite to austenite phase transformations in low-carbon steels.
  • The findings highlight the importance of mixed-mode growth in controlling transformation kinetics.
  • The model's accuracy suggests its utility in optimizing heat treatment processes for steel manufacturing.