Transformation from ferrite to austenite during/after solidification in peritectic steel systems: An x-ray imaging study

Hideyuki YASUDA, Kohei MORISHITA, Masato YOSHIYA, Taka NARUMI

Research output: Contribution to journalReview articlepeer-review

Abstract

X-ray transmission imaging with X-ray diffractometry and time-resolved tomography with three-dimensional X-ray diffraction microscopy have been used to observe solidification and transformation in carbon steel and other Fe-based alloys. The imaging techniques showed a massive-like transformation, in which multiple austenite grains were produced in a single δ grain through a solid-solid transformation. The critical velocity from the diffusion-controlled growth of the γ phase to the massive-like transformation was as low as 5 μm/s. X-ray imaging indicated that the δ phase transforms massively to the γ phase in the conventional solidification processes, such as continuous casting. The massive-like transformation and multiple γ grains that were produced in the transformation were related to the subsequent microstructure evolution and casting defect formation. Solidification model including the massive-like transformation is expected to improve our understanding the solidification and the related phenomena in the peritectic steel systems.

Original languageEnglish
Pages (from-to)2755-2764
Number of pages10
Journalisij international
Volume60
Issue number12
DOIs
Publication statusPublished - Dec 15 2020

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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