Effects of ferrite growth rate on interphase boundary precipitation in V microalloyed steels

Toshio Murakami, Hitoshi Hatano, Goro Miyamoto, Tadashi Furuhara

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The interphase boundary precipitation behavior of vanadium carbide during isothermal ferrite transformation, which is the important phenomena for the hot forged medium carbon steels, was investigated and modeled. It was found that the intersheet spacing of interphase boundary precipitation of VC decreased with a decrease of ferrite growth rate during isothermal transformation. As a major factor affecting such an interphase boundary precipitation behavior, it was deduced that the vanadium segregation on migrating austenite/ferrite interphse boundary is quite important to understand the repeated precipitation of VC. In numerical simulation of VC precipitation, the influence of the vanadium concentration on the precipitation behavior at austenite/ferrite interface during isothermal transformation was examined based on a time-dependent solute drag model incorporated with parabolic growth rate. It was found that the change of the intersheet spacing during ferrite growth can be simulated by the newly proposed model for interphase boundary precipitation of alloy carbide.

Original languageEnglish
Pages (from-to)616-625
Number of pages10
JournalIsij International
Volume52
Issue number4
DOIs
Publication statusPublished - 2012

Keywords

  • Interphase boundary precipitation
  • Medium carbon steel
  • Vanadium carbide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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