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

43 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

Fingerprint

Powders
Wear of materials
Glass
microstructure
Microstructure
Abrasion
Lasers
glass
Coatings
lasers
Martensite
coatings
Wear resistance
Ferrite
scars
abrasives
martensite
wear resistance
microbalances
Laser cladding

Keywords

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

Cite this

Matthews, D.T.A. ; Ocelík, V. ; Branagan, D. ; de Hosson, J.Th.M. / Laser engineered surfaces from glass forming alloy powder precursors : Microstructure and wear. In: Surface and coatings technology. 2009 ; Vol. 203, No. 13. pp. 1833-1843.
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Laser engineered surfaces from glass forming alloy powder precursors : Microstructure and wear. / Matthews, D.T.A.; Ocelík, V.; Branagan, D.; de Hosson, J.Th.M.

In: Surface and coatings technology, Vol. 203, No. 13, 25.03.2009, p. 1833-1843.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Laser engineered surfaces from glass forming alloy powder precursors

T2 - Microstructure and wear

AU - Matthews, D.T.A.

AU - Ocelík, V.

AU - Branagan, D.

AU - de Hosson, J.Th.M.

PY - 2009/3/25

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N2 - 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.

AB - 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.

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