Wear Resistance of Boron-Modified Supermartensitic Stainless Steel Coatings Produced by High-Velocity Oxygen Fuel Process

Autor(es)

Koga, G. Y. ^[1] ; Zepon, G. ^[1] ; Santos, L. S. ^[1] ; Bolfarini, C. ^[1] ; Kiminami, C. S. ^[1] ; Botta, W. J. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Mat Sci & Engn, Rod Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THERMAL SPRAY TECHNOLOGY; v. 28, n. 8, p. 2003-2014, DEC 2019.
• Citações Web of Science: 0

Resumo

The wear resistance of boron-modified supermartensitic stainless steel coatings produced by high-velocity oxygen fuel (HVOF) was investigated through pinon-disk measurements. It was shown that addition of boron leads to the formation of an interconnected and rigid boride network delimiting the grain boundaries of the martensitic matrix. A very refined structure was formed as result of the high cooling rates imposed to the molten alloy during the HVOF process. The specific wear rates of the HVOF coatings were about tenfold lower than the boron-free supermartensitic stainless steel, lying in the order of 10(-5) mm(3)/N m. The refined boride skeleton along the HVOF coating was found to be effective to reduce the materials' removal from the exposed softer martensitic matrix. While the supermartensitic stainless steel master alloy and the mild steel substrate displayed severe adhesive wear, the HVOF coatings exhibited mild delamination wear at low sliding velocities (10 and 20 cm/s) and abrasive wear at the highest tested velocity (40 cm/s). The studied boron-modified supermartensitic HVOF coatings are an interesting approach to protect the surface of inexpensive steel substrates against wear. (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: 17/09237-4 - Design e produção de aços inoxidáveis modificados com boro conformados por spray de elevada resistência a corrosão e ao desgaste
• Beneficiário: Guilherme Yuuki Koga
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado