Effect of TiN precipitates on austenite grain size in Fe-1.5%Mn-0.12%Ti- Si(<1.1%)-C(0.05 and 0.15%) alloy

Hiroki Ohta, Ryo Inoue, Hideaki Suito

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

In order to clarify the effect of non-uniformly dispersed TiN particles on the inhibition of austenite grain growth at non-steady state, an Fe-1.5%Mn-0.12%Ti-Si(1.1%)-N(20-130ppm)-C(0.05 and 0,15%) alloy with and without Mg deoxidation has been cooled from 1 873 to 1 473K at 50 or 5K-min -1, followed by quenching, The austenite grain size distributions have been measured as functions of C, N and Si contents, Mg deoxidation and cooling rate. It was found that the γ grain growth is inhibited by the uniformly dispersed TiN particles which are found at 0.05% C, The effect of Si (0-1.1 %) content on the γ grain size at given C, N and Ti contents has not been observed. In Mg deoxidation the number of TiN+MgO and TiN particles is about two times larger than that without Mg deoxidation, thus leading to smaller γ grain size. The mean γ grain size, D̄A, decreases with increasing the Zener pinning force at 0.05% C, but is independent of it at 0.15% C. The D̄A value at 50 K'min-1 is lower than that at 5 K-min-1 at 0.05% C, but the D̄A value is independent of the cooing rate at 0.15% C. This is explained by the fact that with decreasing cooling rate the number of uniformly dispersed TiN particles decrease considerably at 0.05% C, but only TiN particles at interdendritic region decrease at 0.15 % C.

Original languageEnglish
Pages (from-to)294-300
Number of pages7
JournalIsij International
Volume48
Issue number3
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Austenite grain size
  • Fe-C alloy
  • Mg deoxidation
  • TiN precipitation
  • Zener pinning force

ASJC Scopus subject areas

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

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