| Full text | |
| Author(s): |
Giovana Giroto
[1]
;
Piter Gargarella
[2]
;
Rudimar Riva
[3]
;
Claudio Shyinti Kiminami
[4]
;
Marcos Fernandes de Carvalho
[5]
;
Conrado Ramos Moreira Afonso
[6]
Total Authors: 6
|
| Affiliation: | [1] Universidade Federal de São Carlos. Departamento de Engenharia de Materiais (DEMa) - Brasil
[2] Universidade Federal de São Carlos. Departamento de Engenharia de Materiais (DEMa) - Brasil
[3] Instituto de Estudos Avançados - Brasil
[4] Universidade Federal de São Carlos. Departamento de Engenharia de Materiais (DEMa) - Brasil
[5] Universidade Federal de São Carlos. Departamento de Engenharia de Materiais (DEMa) - Brasil
[6] Universidade Federal de São Carlos. Departamento de Engenharia de Materiais (DEMa) - Brasil
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 20, p. 836-841, 2018-02-01. |
| Abstract | |
MoS2 powder has been used to form "self-lubricating" composite coatings, which are very useful to increase the lifetime of machines where liquid lubricants cannot be used. In this work, amorphous overspray powder of Fe60Cr8Nb8B24 (at%) alloy was mixed with 5wt.% MoS2 powder and it was used to produce single tracks on AISI 1020 steel substrates by laser cladding. The tracks were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Vickers microhardness. It was observed α-Fe, an Nb-rich intermetallic and MoS2 particles in the tracks, regardless of laser parameter used. DSC analyses proved the presence of amorphous phase for samples produced with parameters 200W/33.3mm/s, 600W/100mm/s, 800W/100mm/s and 800W/150mm/s. The tracks produced with larger power (800W) and higher scanning speeds (100 and 150mm/s) exhibited a better integrity and homogeneity, lower dilution and presence of amorphous phase, being these parameters considered the most appropriate to produce composite coatings of Fe60Cr8Nb8B24 (at%)/5wt% MoS2 containing amorphous phase. Hardness tests showed that the single tracks produced are harder than the substrate, for example, the track produced with 800W/150mm/s exhibits hardness six times higher than the steel substrate, 1200 HV0.3 and 200 HV0.3, respectively. (AU) | |
| FAPESP's process: | 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys |
| Grantee: | Claudio Shyinti Kiminami |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 12/18429-0 - Laser surface treatment of Amorphizable and nanocrystalline iron-based metallic alloys |
| Grantee: | Conrado Ramos Moreira Afonso |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 15/04062-6 - Coatings of fe-based metallic glasses and self-lubricating composites with MoS2 by laser cladding |
| Grantee: | Giovanna Giroto |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 14/13432-9 - Coatings of steel made of wear resistant nanocrystalline and amorphizable iron-based alloys |
| Grantee: | Marcos Fernandes de Carvalho |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |