Interface Energies of Hetero- and Homo-Phase Boundaries and Their Impact on δ-γ Massive-Like Phase Transformations in Carbon Steel

• Yoshiya Masato

  Department of Adaptive Machine Systems, Osaka University Nanostructures Research Laboratory, Japan Fine Ceramics Center

• Nakajima Kenta

  Department of Adaptive Machine Systems, Osaka University

• Watanabe Manabu

  Department of Adaptive Machine Systems, Osaka University

• Ueshima Nobufumi

  Department of Adaptive Machine Systems, Osaka University

• Nagira Tomoya

  Department of Adaptive Machine Systems, Osaka University

• Yasuda Hideyuki

  Department of Adaptive Machine Systems, Osaka University Department of Materials Science and Engineering, Kyoto University

書誌事項

タイトル別名

• Interface Energies of Hetero- and Homo-Phase Boundaries and Their Impact on δ-γ Massive-Like Phase Transformations in Carbon Steel

抄録

Systematic atomistic simulations of homo- and hetero-phase boundaries have been carried out to quantify interphase boundary energies in iron including δ-phase and γ-phase grain boundaries and δ/γ, δ/liquid and γ/liquid interfaces. Due to structural mismatch between body centered cubic (BCC) and face centered cubic (FCC) structures of the δ and γ phases, the minimum interface energy of the δ/γ interface is as high as 0.41 J/m², much higher than the minimum interface energies of the δ/δ and γ/γ homo-phase interfaces, which are zero, suggesting that the high interface energy is one of the key factors that lead to the massive-like phase transformation from the δ phase to the γ phase observed by in situ radiography. Although the minimum δ/γ interface energy is not significantly higher than the δ/liquid interface energy that determines the δ nucleation upon solidification, it is yet high enough for the small entropy change upon the phase transformation to inhibit γ nucleation at a given critical radius until more than one orders of magnitude higher undercooling is achieved according to the classical theory of homogeneous nucleation.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 56 (9), 1461-1466, 2015

  公益社団法人 日本金属学会

キーワード

• carbon steel
• nucleation
• phase transformation
• grain boundaries
• atomistic simulation
• interface energy

詳細情報

• CRID: 1390282679229858304
• NII論文ID: 130005094795
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.ma201568
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 026709454
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026709454
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/56/9/56_MA201568/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可