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 language | English |
|---|---|
| Pages (from-to) | 1833-1843 |
| Number of pages | 11 |
| Journal | Surface and coatings technology |
| Volume | 203 |
| Issue number | 13 |
| Early online date | 19 Jan 2009 |
| DOIs | |
| Publication status | Published - 25 Mar 2009 |
| Externally published | Yes |
Fingerprint
Keywords
- Laser
- Metallic glass
- Microscopy
- Nanosteel
- Wear resistance
Cite this
}
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 journal › Article › Academic › peer-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
Y1 - 2009/3/25
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.
KW - Laser
KW - Metallic glass
KW - Microscopy
KW - Nanosteel
KW - Wear resistance
U2 - 10.1016/j.surfcoat.2009.01.015
DO - 10.1016/j.surfcoat.2009.01.015
M3 - Article
AN - SCOPUS:60949109641
VL - 203
SP - 1833
EP - 1843
JO - Surface and coatings technology
JF - Surface and coatings technology
SN - 0257-8972
IS - 13
ER -