Study of phase transformations in heat treatment of HVOF thermally sprayed WC-17Co coating

Sh Khameneh Asl, M. Heydarzadeh Sohi, K. Hokamoto, M. Matsuda, R. Tomoshige, M. Nishida

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

In this work, WC-17Co powder was thermally sprayed onto mild steel using HVOF spray technique. The coated specimen was heat treated at 1100°C in a vacuum chamber and was then studied by using transmission electron microscopy (TEM). Post heat treatment resulted in recrystallization of the amorphous phase, formed during thermal spraying, into low carbon eta phase like Co 6W6C TEM results of the heat treated specimens showed that these new nucleated eta phases had very clear crystallographic structure without any crystalline defects. Heat treatment could also transform high carbon carbides like WC and W2C in the as sprayed samples to high carbon eta phases like Co3W3C. High density of dislocations and staking faults noticed in TEM of these phases might be an indication of possible shear mechanism in formation of these carbides.

Original languageEnglish
Pages (from-to)161-166
Number of pages6
JournalMaterials Science Forum
Volume566
Publication statusPublished - Jan 29 2008
Externally publishedYes
Event2nd International Symposium on Explosion, Shock Wave and Hypervelocity Phenomena, ESHP-2 - Kumamoto, Japan
Duration: Mar 6 2007Mar 9 2007

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Asl, S. K., Sohi, M. H., Hokamoto, K., Matsuda, M., Tomoshige, R., & Nishida, M. (2008). Study of phase transformations in heat treatment of HVOF thermally sprayed WC-17Co coating. Materials Science Forum, 566, 161-166.