Laser Remelting of Zirconia Surface: Investigation into Stress Field and Microstructures


Yilbas B. S. , Akhtar S. S. , Matthews A., Karatas C.

MATERIALS AND MANUFACTURING PROCESSES, vol.26, no.10, pp.1277-1287, 2011 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 10
  • Publication Date: 2011
  • Doi Number: 10.1080/10426914.2011.551955
  • Journal Name: MATERIALS AND MANUFACTURING PROCESSES
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1277-1287

Abstract

Investigation into the laser remelting of zirconia surfaces in a nitrogen gas environment is carried out. The thermal stress fields during and after the laser treatment process are predicted numerically. The microstructural and morphological changes in the laser-treated region are examined using optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The residual stresses are determined using the XRD technique. It is found that the residual stress predicted remains high along a depth of 50 mu m below the laser-treated surface. The predictions of residual stress agree well with the XRD data. A fine dendritic structure is formed in the vicinity of the surface, which contributes to the surface hardness. In addition, transformation of t-ZrO(2) to c-ZrO(2) at high temperature is accompanied by the formation of ZrN in the surface vicinity.