Effects of gas blow velocity on the surface properties of Ti-6Al-4V alloy treated by gas blow IH nitriding

Shogo Takesue, Shoichi Kikuchi, Hiroyuki Akebono, Jun Komotori, Kengo Fukazawa, Yoshitaka Misaka

Research output: Contribution to journalArticle

Abstract

In this study, the effects of gas blow velocity on the surface properties of a Ti-6Al-4V alloy treated by a gas blow induction heating (IH) nitriding system were investigated. The surface microstructure of the treated specimens was characterized using scanning electron microscope and X-ray diffraction. In addition, micro-Vickers hardness and nanohardness were measured and reciprocating wear tests were conducted to evaluate the modified surface layers. The results showed that the nitriding of a specimen was facilitated by using a smaller gas blow nozzle. Incorporating the smaller nozzle resulted in an increase in gas blow velocity, which in turn increased the IH power and the temperature inside a specimen, thus accelerating the nitrogen diffusion. Moreover, nitriding at a lower treatment temperature (973 K) was achieved by increasing gas blow velocity. The specimen nitrided at a lower temperature with a high gas blow velocity exhibited better wear resistance than the untreated specimen. This process also inhibited transformation to an acicular α phase, which involves apparent grain coarsening.

Original languageEnglish
Pages (from-to)288-293
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume81
Issue number5
DOIs
Publication statusPublished - 2017

Fingerprint

induction heating
Induction heating
nitriding
Nitriding
surface properties
Surface properties
Gases
gases
nozzles
Nozzles
Vickers hardness
wear tests
Nanohardness
wear resistance
Coarsening
surface layers
Temperature
electron microscopes
Wear resistance
titanium alloy (TiAl6V4)

Keywords

  • Gas blow velocity
  • Induction heating
  • Microstructure
  • Nitriding
  • Surface modification
  • Titanium alloy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Effects of gas blow velocity on the surface properties of Ti-6Al-4V alloy treated by gas blow IH nitriding. / Takesue, Shogo; Kikuchi, Shoichi; Akebono, Hiroyuki; Komotori, Jun; Fukazawa, Kengo; Misaka, Yoshitaka.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 81, No. 5, 2017, p. 288-293.

Research output: Contribution to journalArticle

Takesue, Shogo ; Kikuchi, Shoichi ; Akebono, Hiroyuki ; Komotori, Jun ; Fukazawa, Kengo ; Misaka, Yoshitaka. / Effects of gas blow velocity on the surface properties of Ti-6Al-4V alloy treated by gas blow IH nitriding. In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 2017 ; Vol. 81, No. 5. pp. 288-293.
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AU - Fukazawa, Kengo

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AB - In this study, the effects of gas blow velocity on the surface properties of a Ti-6Al-4V alloy treated by a gas blow induction heating (IH) nitriding system were investigated. The surface microstructure of the treated specimens was characterized using scanning electron microscope and X-ray diffraction. In addition, micro-Vickers hardness and nanohardness were measured and reciprocating wear tests were conducted to evaluate the modified surface layers. The results showed that the nitriding of a specimen was facilitated by using a smaller gas blow nozzle. Incorporating the smaller nozzle resulted in an increase in gas blow velocity, which in turn increased the IH power and the temperature inside a specimen, thus accelerating the nitrogen diffusion. Moreover, nitriding at a lower treatment temperature (973 K) was achieved by increasing gas blow velocity. The specimen nitrided at a lower temperature with a high gas blow velocity exhibited better wear resistance than the untreated specimen. This process also inhibited transformation to an acicular α phase, which involves apparent grain coarsening.

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