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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Laser Cladding of Fe-based Metallic Glass/MoS2 Self-lubricating Composites: Effect of Power and Scanning Speed

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Giroto, Giovana [1] ; Gargarella, Piter [1] ; Riva, Rudimar [2] ; Kiminami, Claudio Shyinti [1] ; de Carvalho, Marcos Fernandes [1] ; Moreira Afonso, Conrado Ramos [1]
Total Authors: 6
[1] Univ Fed Sao Carlos, Dept Engn Mat DEMa, Rodovia Washington Luis, Km 245, BR-13565905 Sao Carlos, SP - Brazil
[2] Inst Estudos Avancados IEAv, Trevo Coronel Aviador Jose Alberto Albano Amarant, BR-12228001 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 1

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 alpha-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 type: Research Projects - Thematic Grants
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 type: Scholarships in Brazil - Post-Doctorate
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 type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 12/18429-0 - Laser surface treatment of Amorphizable and nanocrystalline iron-based metallic alloys
Grantee:Conrado Ramos Moreira Afonso
Support type: Regular Research Grants