1.5Mn-1.5Si-0.2C 鋼におけるフェライト-パーライト変態その場中性子回折

Translated title of the contribution: In situ neutron diffraction on ferrite and pearlite transformations for a 1.5Mn-1.5Si-0.2C steel

Yo Tomota, Yan Xu Wang, Takahito Ohmura, Nobuaki Sekido, Stefanus Harjo, Takuro Kawasaki, Wu Gong, Akira Taniyama

Research output: Contribution to journalArticle

Abstract

The phase transformation behavior from austenite upon cooling in a 1.5Mn-1.5Si-0.2C steel was in situ monitored using dilatometry, X-ray and neutron diffractions. The starting temperature of ferrite transformation was in good agreement between dilatometry and neutron diffraction, whereas much higher in X-ray diffraction. Such a discrepancy in transformation temperature is attributed to the change in chemical composition near the surface of a specimen heated to elevated temperatures in a helium gas atmosphere for X-ray diffraction. In situ neutron diffraction enables us to investigate the changes in lattice constants of ferrite and austenite, which are affected by not only thermal contraction but also transformation strains, thermal misfit strains and carbon enrichment in austenite. Pearlite transformation started after carbon enrichment in austenite reached approximately 0.7 mass% and contributed to diffraction line broadening.

Translated title of the contributionIn situ neutron diffraction on ferrite and pearlite transformations for a 1.5Mn-1.5Si-0.2C steel
Original languageJapanese
Pages (from-to)262-271
Number of pages10
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume106
Issue number5
DOIs
Publication statusPublished - 2020 May 1

ASJC Scopus subject areas

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

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