<i>In situ</i> Neutron Diffraction on Ferrite and Pearlite Transformations for a 1.5Mn-1.5Si-0.2C Steel

DOI Web Site Web Site 26 References Open Access
  • Tomota Yo
    Innovative Structural Materials Association Research Center of Structure Materials, National Institute for Materials Science
  • Wang Yan Xu
    Innovative Structural Materials Association Research Center of Structure Materials, National Institute for Materials Science
  • Ohmura Takahito
    Innovative Structural Materials Association Research Center of Structure Materials, National Institute for Materials Science
  • Sekido Nobuaki
    Innovative Structural Materials Association Research Center of Structure Materials, National Institute for Materials Science
  • Harjo Stefanus
    J-PARC Center, Japan Atomic Energy Agency
  • Kawasaki Takuro
    J-PARC Center, Japan Atomic Energy Agency
  • Gong Wu
    Elements Strategy Initiative for Structural Materials, Kyoto University
  • Taniyama Akira
    Innovative Structural Materials Association Advanced Technology Research Laboratories, Nippon Steel Corporation

Bibliographic Information

Other Title
  • 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
  • 1.5Mn-1.5Si-0.2Cコウ ニ オケル フェライト-パーライト ヘンタイ ソノ バ チュウセイシ カイセツ

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Abstract

<p>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.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 106 (5), 262-271, 2020

    The Iron and Steel Institute of Japan

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