Microstructure Characterization of Nickel Matrix Composite Reinforced with Tungsten Carbide Particles and Produced by Laser Cladding

Josef Domitner*, Zahra Silvayeh, Ricardo Henrique Buzolin, Sabine Krisam, Klaus Achterhold, Erwin Povoden-Karadeniz, Christof Sommitsch, Peter Mayr

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Detailed experimental characterization of a laser-clad metal matrix composite (MMC) consisting of hard tungsten carbide particles embedded in a comparatively soft nickel-based matrix is provided. Special focus of the investigations is placed on the relationship between the microstructure of the as-deposited reinforcing particles and their hardness. Therefore, thermally induced dissolution of carbides caused by laser metal deposition (LMD) processing is studied. The as-received powder blend mainly consists of fused spherical particles of ditungsten carbides (W 2C, W 2C 1−x) and monotungsten carbides (WC, WC 1−x). Dissolution of large particles at the matrix/particle interfaces and fragmentation or even complete dissolution of small particles due to the high process temperature of LMD is observed. Primary W 2C/W 2C 1−x phases are partially dissoluted, and layers of secondary WC/Ni xW yC phases are formed at the matrix/particle interfaces. As these surface layers are less hard than the as-received particles, the local hardness gradually decreases from the inner region of the particles across the surface layer toward the matrix, which is supposed to improve bonding of the particles inside the matrix. The hardness depends on the grain size and on the crystal structure of the carbides. Even when the crystal structures are identical, particles consisting of fine grains have considerably higher hardness than particles consisting of coarse grains.

Original languageEnglish
Article number2200463
Number of pages12
JournalAdvanced Engineering Materials
Volume24
DOIs
Publication statusPublished - 2022

Keywords

  • hardfacing
  • laser cladding
  • laser metal deposition
  • LMD
  • metal matrix composites
  • MMC
  • nickel alloy
  • tungsten carbides
  • wear resistance

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Fields of Expertise

  • Mobility & Production

Fingerprint

Dive into the research topics of 'Microstructure Characterization of Nickel Matrix Composite Reinforced with Tungsten Carbide Particles and Produced by Laser Cladding'. Together they form a unique fingerprint.

Cite this