Effect of Si on precipitation behavior of Nb-Laves phase and amount of Nb in solid solution at elevated temperature in high purity 17%Cr-0.5%Nb steels

Yasushi Kato, Masatoshi Ito, Yoshimine Kato, Osamu Furukimi

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27 Citations (Scopus)

Abstract

The effect of Si was investigated on the precipitation behavior and the amount of Nb in solid solution at temperature ranging from 1073 to 1173 K in high purity 17Cr-0.5Nb steels. Adding Si promoted the precipitation of the Nb Laves phase and then decreased the solubility of Nb in steels. The Nb Laves phase which was composed of Fe, Cr and Nb could be expressed as (Fe, Cr) 2Nb in a 0.002 mass% Si steel. On the other hand, in a 0.5 mass% Si steel the Nb Laves phase which was composed of Fe, Si, Cr and Nb could be expressed as (Fe, Si, Cr)2Nb. Based on calculations from the experimental results assuming the Laves phase is Fe2Nb, the standard free energy change of the Fe2Nb precipitation reaction was about -61kJ/mol for a 0.002 mass% Si steel.

Original languageEnglish
Pages (from-to)1531-1535
Number of pages5
JournalMaterials Transactions
Volume51
Issue number9
DOIs
Publication statusPublished - Sep 2010

All Science Journal Classification (ASJC) codes

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

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