Abstract
Self-lubrication anti-wear composite coatings were fabricated on 304 stainless steel by laser cladding with the mixture of Ni60 and hBN powders. The composite coatings were heated at 600℃ for 1 h and 2 h to study the effects of heat treatment on mechanical properties of the coatings. The microstructure, microhardness, nano-indentation and tribological properties of the different coatings were analyzed. Results indicate that the microhardness of the coatings and the hardness of γ-(Ni,Fe) solid solution without heat treatment are 641.1 HV0.5 and 5.09 GPa, respectively. The microhardness of the coatings and the nano-hardness of γ-(Ni,Fe) solid solution after heat treatment for 1 h and 2 h are 701.2 HV0.5, 7.20 GPa and 652.4 HV0.5, 3.77 GPa, respectively. Compared with the coatings without heat treatment and heat-treated for 2 h, the composite coating after heat treatment for 1 h presents excellent anti-wear and friction reduction properties, for which the friction coefficient and wear volume loss are 0.4 and 0.0130 mm3. Wear surface of Si3N4 counter-ball is smooth without obvious plastic deformation. The main wear mechanism is slightly abrasive wear.
| Original language | English |
|---|---|
| Pages (from-to) | 229-235 |
| Number of pages | 7 |
| Journal | Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment |
| Volume | 36 |
| Issue number | 12 |
| Publication status | Published - 25 Dec 2015 |
| Externally published | Yes |
Keywords
- Anti-wear and friction reduction
- Laser cladding
- Nano-indentation
- Post heat treatment