In-situ synthesis of a carbide reinforced steel matrix surface nanocomposite by laser melt injection technology and subsequent heat treatment

O. Verezub, Z. Kálazi, G. Buza, N. V. Verezub, G. Kaptay

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The concept of in-situ synthesis of composites by laser melt injection technology is introduced, dictated by the minimum size requirement for particles being able to incorporate into liquid metals. The mixture of relatively large Ti and WC particles are blown into the laser melted pool of a low-alloyed steel substrate. Macroscopically, the 1-mm thick melted layer appears to be homogeneous, due to the strong Marangoni convection. Sub-micron-sized (Ti, W)C primary particles are precipitated from liquid steel upon fast cooling and solidification. Upon heat treatment a large number of nano-sized (Fe,W)6C particles precipitated from the oversaturated steel matrix. The microhardness of the composite layer is considerably higher compared to that of the initial steel matrix.

Original languageEnglish
Pages (from-to)3049-3057
Number of pages9
JournalSurface and Coatings Technology
Volume203
Issue number20-21
DOIs
Publication statusPublished - Jul 15 2009

Fingerprint

Steel
carbides
Carbides
Nanocomposites
nanocomposites
heat treatment
Heat treatment
steels
injection
Lasers
synthesis
matrices
lasers
Marangoni convection
composite materials
Composite materials
liquid metals
Liquid metals
Microhardness
microhardness

Keywords

  • Carbide precipitates
  • Heat treatment
  • In-situ laser melt injection
  • Steels
  • Surface nano-composites

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

In-situ synthesis of a carbide reinforced steel matrix surface nanocomposite by laser melt injection technology and subsequent heat treatment. / Verezub, O.; Kálazi, Z.; Buza, G.; Verezub, N. V.; Kaptay, G.

In: Surface and Coatings Technology, Vol. 203, No. 20-21, 15.07.2009, p. 3049-3057.

Research output: Contribution to journalArticle

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