Advanced search
Start date
Betweenand
(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

Full text
Author(s):
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
Affiliation:
[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
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 20, n. 2, p. 836-841, 2017.
Web of Science Citations: 1
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 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