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

Autor(es)

Giroto, Giovana ^[1] ; Gargarella, Piter ^[1] ; Riva, Rudimar ^[2] ; Kiminami, Claudio Shyinti ^[1] ; de Carvalho, Marcos Fernandes ^[1] ; Moreira Afonso, Conrado Ramos ^[1]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 20, n. 2, p. 836-841, 2017.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/13432-9 - Tratamento superficial a laser de ligas metálicas ferrosas amorfizáveis e nanocristalinas
• Beneficiário: Marcos Fernandes de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/04062-6 - Recobrimentos de ligas ferrosas vítreas e compósitos autolubrificantes com MoS2 através de laser cladding
• Beneficiário: Giovanna Giroto
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 12/18429-0 - Tratamento superficial a laser de ligas metálicas à base de ferro amorfizáveis e nanocristalinas
• Beneficiário: Conrado Ramos Moreira Afonso
• Modalidade de apoio: Auxílio à Pesquisa - Regular