Microstructure evolution of laser clad layers of W-C-Co alloy powders

Yongqiang Yang, Hau Chung Man

Research output: Journal article publicationJournal articleAcademic researchpeer-review

51 Citations (Scopus)


Clad layers using high power carbon dioxide laser and various powder compositions of W, C, Co and WC on carbon steel substrate have been investigated. Microstructures of the clad layers are greatly affected by the processing parameters: powder size; powder type; shielding gas; degree of dilution; and geometry of the clad layer. Clad layers with large WC particles in a eutectic matrix and a high hardness, or with a mostly eutectic structure and low hardness, can be made for applications of cutting tools or wear resistant surfaces, respectively. Microstructure such as: (1) WC, Co3W3C, and a binary eutectic mixture of Co3W3C and α-(Fe,Co); (2) Co3W3C and a binary eutectic mixture of Co3W3C and α'-(Fe,Co); (3) a binary eutectic mixture of Co3W3C and α'-(Fe,Co) have been produced in the clad layer.
Original languageEnglish
Pages (from-to)130-136
Number of pages7
JournalSurface and Coatings Technology
Issue number2-3
Publication statusPublished - 1 Oct 2000


  • Laser cladding
  • Microstructure evolution
  • W-C-Co alloy powders

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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