CO2 laser gas assisted nitriding of Ti-6Al-4V alloy


Yibas B. S. , Karatas C., Uslan U., KELEŞ Ö. , Usta I. Y. , Ahsan M.

APPLIED SURFACE SCIENCE, cilt.252, sa.24, ss.8557-8564, 2006 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 252 Konu: 24
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.apsusc.2005.11.076
  • Dergi Adı: APPLIED SURFACE SCIENCE
  • Sayfa Sayıları: ss.8557-8564

Özet

Laser gas assisted nitriding of Ti-6Al-4V alloy is carried out and nitride compounds formed and their concentration in the surface vicinity are examined. SEM, XRD and XPS are accommodated to examine the nitride layer characteristics. Microhardness across the nitride layer is measured. Temperature field and nitrogen distribution due to laser irradiation pulse is predicted. It is found that the nitride layer appears like golden color; however, it becomes dark gold color once the laser power irradiation is increased. The delta-TiN and epsilon-TiN are dominant phases in the surface vicinity. The needle like dendrite structure replace with the feathery like structure in the surface region due to high nitrogen concentration. No porous or microcracks are observed in the nitrided layer, except at high power irradiation, in this case, elongated cracks are observed in the surface region where the nitrogen concentration is considerably high. (c) 2005 Elsevier B.V. All rights reserved.