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

研究成果: Article査読

抄録

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.

本文言語English
ページ(範囲)288-293
ページ数6
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
81
5
DOI
出版ステータスPublished - 2017

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金
  • 材料化学

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