Kinetics of reverse transformation from pearlite to austenite in an Fe-0.6 mass pct C alloy and the effects of alloying elements

Zhao Dong Li, Goro Miyamoto, Zhi Gang Yang, Tadashi Furuhara

研究成果: Article査読

33 被引用数 (Scopus)

抄録

Substitutional alloying effects on reversion kinetics from pearlite structure at 1073 K (800 °C) in an Fe-0.6 mass pct C binary alloy and Fe-0.6C-1 or 2 mass pct M (M = Mn, Si, Cr) ternary alloys were studied. Reverse transformation in the Fe-0.6C binary alloy at 1073 K (800 °C) was finished after holding for approximately 5.5 seconds. The reversion kinetics was accelerated slightly by the addition of Mn but retarded by the addition of Si or Cr. The difference of acceleration effects by the addition of the 1 and 2 mass pct Mn is small, whereas the retardation effect becomes more significant by increasing the amount of addition of Si or Cr. It is clarified from the thermodynamic viewpoint of carbon diffusion that austenite can grow without partitioning of Mn or Si in the Mn- or Si-added alloys. On the one hand, austenite growth is controlled by the carbon diffusion, whereas the addition of them affects carbon activity gradient, resulting in changes in reversion kinetics. On the other hand, thermodynamic calculation implies that the long-range diffusion of Cr is necessary for austenite growth in the Cr-added alloys. It is proposed that austenite growth from pearlite in the Cr-added alloys is controlled by the diffusion of Cr along austenite/pearlite interface.

本文言語English
ページ(範囲)1586-1596
ページ数11
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
42
6
DOI
出版ステータスPublished - 2011 6

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金

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