High Modulus Steel Produced by Cold Spray Additive Manufacturing

Autor(es)

Otani, Lucas B. ; Schonemann, Lars ; Karpuschewski, Bernhard ; Baron, Christian ; Springer, Hauke ; Bolfarini, Claudemiro ; Uhlenwinkel, Volker

• Tipo de documento: Artigo Científico
• Fonte: METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE; v. 53, n. 3, p. 10-pg., 2022-04-06.

Resumo

For the first time a high modulus steel (HMS) was produced by the powder-based cold spray additive manufacturing technique. The advantage of such technique is the lower thermal input leading to lower oxidation levels and higher deposition rates compared to laser additive manufacturing techniques. The objective of this work is to explore the possibilities and main challenges when using the powder-based cold spray additive manufacturing process to produce high modulus steels, which represent a novel concept for lightweight design, based here on TiB2 dispersed in a ferritic matrix. The deposits were obtained by cold spraying of the HMS powder onto aluminum substrates. The results showed that the deposit presented an extremely high hardness of more than 670 HV due to high deformation levels of the matrix and refined microstructure. A non-equilibrium microstructure in the deposit was obtained, and after heat treatment the titanium diborides precipitated along the grain/subgrain boundaries. The average hardness of the material in this condition was 338 HV. The bonding between particles was not perfect, and the oxygen content of the deposit was relatively high (0.21 wt pct), leading to the conclusion that further studies must consider improving the gas velocity associated to controlling the oxygen content. (AU)

• Processo FAPESP: 18/12638-3 - Processamento e caracterização de aços de baixa densidade através da conformação por spray em escala semi-industrial
• Beneficiário: Lucas Barcelos Otani
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 17/14805-1 - Efeito da adição de Al e C nas propriedades mecânicas de aços de baixa densidade conformados por spray
• Beneficiário: Lucas Barcelos Otani
• Modalidade de apoio: Bolsas no Brasil - Doutorado