Time-resolved and in-situ observation of δ-γ transformation during unidirectional solidification in Fe-C alloys

Tomohiro Nishimura, Kohei Morishita, Masato Yoshiya, Tomoya Nagira, Hideyuki Yasuda

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Synopsis: Time-resolved and in-situ observations using synchrotron radiation X-rays successfully proved that the massive-like transformation, in which the γ phase was produced through the solid - solid transformation and the partition of substitute elements such as Mn and Si at the δ/γ interface could be negligibly small, was selected in the unidirectional solidification of 0.3 mass%C steel at a pulling rate of 50 μm/s. The massive-like transformation produced fine γ grains in the vicinity of the front of δ/γ interface. The coarse γ grains also grew behind the fine γ grains along the temperature gradient. Distance between the δ/γ front and the advancing front of coarse γ grains was as short as 200 μm. Namely, the fine γ grains disappeared within 10 s by the growth of coarsen γ grains along the temperature gradient. In addition, the observation of the δ/γ interface confirmed that a transition from the diffusion-controlled γ growth to the massive-like growth of γ phase occurred at a growth rate of 5 μm/s. Thus, the massive-like transformation is dominantly selected in the carbon steel during conventional solidification processes.

Original languageEnglish
Pages (from-to)168-176
Number of pages9
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume105
Issue number2
DOIs
Publication statusPublished - Feb 1 2019

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solidification
Solidification
Thermal gradients
Carbon steel
temperature gradients
carbon steels
pulling
Synchrotron radiation
partitions
synchrotron radiation
steels
substitutes
X rays
x rays

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Time-resolved and in-situ observation of δ-γ transformation during unidirectional solidification in Fe-C alloys. / Nishimura, Tomohiro; Morishita, Kohei; Yoshiya, Masato; Nagira, Tomoya; Yasuda, Hideyuki.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 105, No. 2, 01.02.2019, p. 168-176.

Research output: Contribution to journalArticle

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AB - Synopsis: Time-resolved and in-situ observations using synchrotron radiation X-rays successfully proved that the massive-like transformation, in which the γ phase was produced through the solid - solid transformation and the partition of substitute elements such as Mn and Si at the δ/γ interface could be negligibly small, was selected in the unidirectional solidification of 0.3 mass%C steel at a pulling rate of 50 μm/s. The massive-like transformation produced fine γ grains in the vicinity of the front of δ/γ interface. The coarse γ grains also grew behind the fine γ grains along the temperature gradient. Distance between the δ/γ front and the advancing front of coarse γ grains was as short as 200 μm. Namely, the fine γ grains disappeared within 10 s by the growth of coarsen γ grains along the temperature gradient. In addition, the observation of the δ/γ interface confirmed that a transition from the diffusion-controlled γ growth to the massive-like growth of γ phase occurred at a growth rate of 5 μm/s. Thus, the massive-like transformation is dominantly selected in the carbon steel during conventional solidification processes.

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