Effects of tempering and Y2O3 content on the microstructure and wear characteristics of a Laser Metal Deposition (LMD) composite coating on a titanium alloy

J. N. Li, T. G. Zhai, Y. B. Zhang, K. G. Liu, P. Liu, Y. S. Huo, C. C. Jiang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Laser melting via laser metal deposition (LMD) of a Stellite SF12-TiC-Y2O3 mixed powder composite coating onto a TA1 Ti-alloy substrate formed nanocrystals reinforced hard composite coating, which increased the wear resistance of the substrate greatly. Experimental results indicated that lots of the nanocrystalline/amorphous phases were produced in such coating. After the tempering process, an uniform and fine compact composite coating was obtained, and the microhardness increased accordingly. When an excess of Y2O3 content was added in the pre-placed coating a great number of the crystals disappeared, resulting in the formation of microcracks. The tempering is able to remove the accumulation of the residual stress in a certain extent, improving the plastic and toughness properties of such LMD coating, leading to an improvement of wear resistance.

Original languageEnglish
Pages (from-to)379-387
Number of pages9
JournalLasers in Engineering
Volume35
Issue number5-6
StatePublished - 2016

Bibliographical note

Funding Information:
This project is supported by National Natural Science Foundation of China (Grant No. 51505257).

Publisher Copyright:
©2016 Old City Publishing, Inc.

Keywords

  • Amorphous
  • CO laser
  • Coefficient of friction (COF)
  • Composite coating
  • Laser metal deposition (LMD)
  • Nanocrystalline
  • Residual stress
  • Stellite
  • Tempering
  • Titanium alloy
  • Wear
  • YO

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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