The role of niobium in the retardation of the early stage of austenite recovery in hot-deformed steels

N. Maruyama, R. Uemori, M. Sugiyama

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

The distribution of Nb at an early stage of austenite recovery in hot-deformed HSLA steels was investigated mainly by APFIM. It was confirmed that the onset of austenite recovery is retarded by the solute atoms of microalloying elements randomly dispersed in the austenite matrix. A simple calculation considering the interaction between solute atoms and defects indicates that the different retardation ability for the onset of austenite recovery of Nb, Ti and V is a result of the difference in impurity diffusion coefficients and in solute-defect interactions. AP analysis of a 0.06 at.% Nb steel revealed that not only single solute atoms but also Nb-N and Nb-C pairs exist at the early stage of recovery. These pairs probably play an important role in the retardation of austenite recovery in hot-deformed steels.

Original languageEnglish
Pages (from-to)2-7
Number of pages6
JournalMaterials Science and Engineering A
Volume250
Issue number1
DOIs
Publication statusPublished - Jul 15 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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