Laser engineered surfaces from glass forming alloy powder precursors: Microstructure and wear

D.T.A. Matthews, V. Ocelík, D. Branagan, J.Th.M. de Hosson*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

44 Citations (Scopus)

Abstract

Fe-based metallic glass forming powders have been deposited on mild steel substrates using high power laser cladding. Coatings microstructures have been analysed by scanning- and transmission-electron microscopy and at varying substrate dilutions, have been found to comprise a 100 to 500 nm interdendritic austenitic phase and a dendritic dual-phase of ferrite/martensite. The application of double layer coatings has shown microstructural refinement. This leads to a needle-like microstructure resulting in a nanoindentation tested hardness increase from ~ 11 GPa up to almost 15 GPa. The layers have been subjected to both dry sliding wear and 3-body microscale abrasive wear testing. The dry sliding results show the layers to exhibit excellent wear resistance - particularly at high speed (50 cm s- 1) with wear rate values of ~ 1 × 10- 8 mm3/Nm being recorded for the double layer coatings. The single layer coatings reveal a micro-wear mechanism connected with the slip between the ferrite and martensite in the dendritic dual-phase. Microscale abrasive wear testing also reveals that the layers have a good wear resistance, with wear scars exhibiting characteristic material removal by micro-chipping. There is no preferential abrasion of any one phase, nor are track over-lap areas, cracks or pores found to result in varying wear scar dimensions.

Original languageEnglish
Pages (from-to)1833-1843
Number of pages11
JournalSurface and coatings technology
Volume203
Issue number13
Early online date19 Jan 2009
DOIs
Publication statusPublished - 25 Mar 2009
Externally publishedYes

Keywords

  • Laser
  • Metallic glass
  • Microscopy
  • Nanosteel
  • Wear resistance

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