Solute cluster-induced precipitation and resultant surface hardening during nitriding of Fe–Al–V alloys

Goro Miyamoto, Yasuhiro Tateyama, Tokuteru Uesugi, Yuichiro Hayasaka, Tadashi Furuhara

Research output: Contribution to journalArticlepeer-review

Abstract

The small amount (0.1 at%) of V addition to Fe–Al alloys promotes AlN precipitation during nitriding and results in substantial surface hardening, in contrast to the normal sluggish precipitation kinetics of AlN during nitriding of Fe–Al binary alloys. The addition of V to Fe–Al alloys can increase the surface hardness to a greater extent than the addition of Ti. First-principles calculations of the interaction energy between an Al atom and an N–s cluster (s = V, Ti, Cr, or Al) show that a V–N cluster has an attractive interaction with an Al atom, and this interaction is stronger than that between a Ti–N cluster and an Al atom, in good agreement with the greater hardening induced by V addition than by Ti addition. These experiments and calculations indicate that solute clusters not only contribute directly to the hardening but also induce alloy nitride precipitation.

Original languageEnglish
Article number114121
JournalScripta Materialia
Volume203
DOIs
Publication statusPublished - 2021 Oct

Keywords

  • Clustering
  • Element interaction
  • Nitriding
  • Precipitation
  • Steel

ASJC Scopus subject areas

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

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