Grain Boundary Nucleation of Proeutectoid Ferrite in an Fe-C-Ni Alloy.

• Enomoto M.

  Department of Materials Science, Ibaraki University

• Kobayashi Y.

  student at Ibaraki University

抄録

The nucleation kinetics of proeutectoid ferrite at austenite grain boundaries were studied in an Fe-C-Ni alloy by observing ferrite particles on fracture facets along prior austenite grain boundaries. Whereas a large scatter in the ferrite particle numbers was observed among grain boundary facets, the average particle number appeared to increase with isothermal holding time. The particle number measured on the polished surface of specimens applying Schwartz-Saltykov analysis also increased with holding time. Diffusion-controlled growth of a ferrite nucleus was simulated incorporating Gibbs-Thomson capillary effect to indicate that the time for a nucleus to grow to a detectable size was insignificantly small. These results seem to show that ferrite nucleation occurred in a sizable time range and continuous nucleation, rather than site saturation (instantaneous nucleation), may account better for ferrite nucleation kinetics at temperatures of measurement. The difference in ferrite particle numbers between the two methods of measurement is discussed in terms of the possible omission of small particles and non-sphericity of ferrite particles etc.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 39 (6), 600-606, 1999

  一般社団法人 日本鉄鋼協会

キーワード

• ferrous alloy
• ferrite transformation
• nucleation
• stereological analysis
• grain boundary

詳細情報

• CRID: 1390282681429990400
• NII論文ID: 10002463536
• NII書誌ID: AA10680712
• DOI: 10.2355/isijinternational.39.600
• COI: 1:CAS:528:DyaK1MXltFanu74%3D
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/39/6/39_6_600/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可