Phase-field Simulation of the Effect of Interphase Boundary Diffusion on Pearlite Transformation in Fe-C System

• Mouri Masato

  Department of Materials Design Innovation Engineering, Graduate School of Engineering, Nagoya University

• Tsukada Yuhki

  Department of Materials Design Innovation Engineering, Graduate School of Engineering, Nagoya University

• Koyama Toshiyuki

  Department of Materials Design Innovation Engineering, Graduate School of Engineering, Nagoya University

Bibliographic Information

Other Title

• Fe-C系のパーライト変態に及ぼす界面拡散の影響のフェーズフィールドシミュレーション
• Fe-Cケイ ノ パーライト ヘンタイ ニ オヨボス カイメン カクサン ノ エイキョウ ノ フェーズフィールドシミュレーション

Abstract

Effect of interphase boundary diffusion of carbon on pearlite transformation in Fe-C system is investigated by phase-field simulations. The model considers volume diffusion in α, γ and θ phases and boundary diffusion at α/γ and γ/θ interfaces. Growth velocity of pearlite at eutectoid composition is simulated under various conditions of interlamellar spacing at 873, 898 and 923 K. The simulation results show that growth velocity has a maximum value (ν) at an interlamellar spacing (λ) at each temperature. The simulated values of ν and λ at different temperatures satisfy the equation νλⁿ=const.; the value of exponent n increases with increasing the value of boundary diffusion coefficient. This result suggests that the value of boundary diffusion coefficient can be estimated from phase-field simulations and experimental value of n. The ratio of volume diffusion flux to boundary diffusion flux (R_v/b) during the formation of pearlite is approximated from the values of volume diffusion coefficient in the γ phase, boundary diffusion coefficient and maximum growth velocity at each temperature. The value of R_v/b is small at 873 and 898 K while it is large at 932 K. It seems that the rate-controlling process of pearlite transformation changes from volume diffusion to interface diffusion with decreasing temperature at 873-932 K.

Journal

• Tetsu-to-Hagane

  Tetsu-to-Hagane 105 (2), 305-313, 2019

  The Iron and Steel Institute of Japan

Keywords

• phase field modeling
• pearlite transformation
• interphase boundary diffusion

Details

• CRID: 1390564238073755392
• NII Article ID: 130007585474
• NII Book ID: AN00151251
• DOI: 10.2355/tetsutohagane.tetsu-2018-081
• ISSN: 18832954
• ISSN: 00211575
• NDL BIB ID: 029495540
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I029495540
• Web Site: https://www.jstage.jst.go.jp/article/tetsutohagane/105/2/105_TETSU-2018-081/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed