Effects of Mn, Si and Cr addition on reverse transformation at 1073 K from spheroidized cementite structure in Fe-0.6 mass% C alloy

G. Miyamoto, H. Usuki, Z. D. Li, T. Furuhara

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The effects of addition of Si, Mn and Cr on the kinetics of reverse transformation at 1073 K from the spheroidized cementite structure obtained by heavy tempering of high carbon martensite are investigated. The rate for reverse transformation is the fastest in the Fe-0.6 mass% C binary material, and becomes slower with the addition of Mn, Si and Cr. In particular, the retarding effect of Cr addition is remarkable, and holding times orders of magnitude longer than for other alloys are necessary to complete the reverse transformation. Based on thermodynamics and TEM/EDS analyses, it is supposed that austenite growth is controlled by carbon diffusion in specimens with Si and Mn added, as well as the Fe-0.6 mass% C binary material, while a decrease in the carbon activity gradient with the addition of these elements results in slower reversion kinetics. However, in the Cr-added specimen, Cr diffusion is necessary for austenite growth, yielding extremely sluggish reaction kinetics.

Original languageEnglish
Pages (from-to)4492-4502
Number of pages11
JournalActa Materialia
Volume58
Issue number13
DOIs
Publication statusPublished - 2010 Aug

Keywords

  • Alloying effect
  • Austenitization
  • Partitioning
  • Phase transformation kinetics
  • Steels

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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