Rapid oxynitriding of Ti6Al4V alloy by induction heating in air+1

Kazuki Tamura, Shogo Takesue, Tatsuro Morita, Elia Marin, Jun Komotori, Yoshitaka Misaka, Masao Kumagai

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, a rapid oxynitriding technique based on induction-heating was developed for the titanium alloy Ti6Al4V, and its effects on surface characteristics of the alloy were investigated. The surface microstructures of the alloy were characterized by employing a scanning electron microscope, electron back-scatter diffraction, X-ray diffraction and nano-indentation tests. Induction-heating in air for 60 s caused the formation of a hardened layer on the Ti6Al4V alloy surface, which can be attributed to the diffusion of oxygen and nitrogen atoms. When water quenching was performed after heating, transformation to an acicular martensitic ¡A phase occurred, resulting in increased in substrate hardness. However, cracks were initiated at the surface of the oxynitrided alloy. The cracks were eliminated through fine particle bombarding treatment, whereas the hardened layer formed by the oxynitriding treatment remained. The obtained results thus indicate that the oxynitriding technique developed in this study can enhance the wear resistance and tensile strength of the Ti6Al4V alloy within a short period of time.

Original languageEnglish
Pages (from-to)111-117
Number of pages7
JournalMaterials Transactions
Volume62
Issue number1
DOIs
Publication statusPublished - 2021 Jan 1

Keywords

  • Hardness
  • Induction heating
  • Microstructure
  • Oxynitriding
  • Titanium alloy

ASJC Scopus subject areas

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

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