Effect of Ni addition and cryogenic hardening on the mechanical and tribological properties of self-lubricating steels produced by MIM |
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Authors: | N. Araya L. E. Vieira José Daniel B. de Mello G. O. Neves C. Binder A. N. Klein |
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Affiliation: | 1. Laboratorio de Materiais, Centro Tecnológico, Universidade Federal de Santa Catarina, Florianópolis, Brazil nicolas.araya@labmat.ufsc.brnicolas.araya.r@gmail.comhttps://orcid.org/0000-0002-6604-1409;4. Departamento de Engenharia Elétrica e Telecomunica??es, Universidade Regional de Blumenau, Blumenau, Brazil https://orcid.org/0000-0002-0841-6903;5. Laboratorio de Materiais, Centro Tecnológico, Universidade Federal de Santa Catarina, Florianópolis, Brazil;6. Laboratorio de Tribología e Materiais, Universidade Federal de Uberlandia, Uberlandia, Brazil https://orcid.org/0000-0001-8912-2132;7. Laboratorio de Materiais, Centro Tecnológico, Universidade Federal de Santa Catarina, Florianópolis, Brazil https://orcid.org/0000-0001-9733-8582;8. Laboratorio de Materiais, Centro Tecnológico, Universidade Federal de Santa Catarina, Florianópolis, Brazil |
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Abstract: | ABSTRACT This paper addresses the relation between mechanical properties and tribological behaviour of self-lubricating steels produced by in-situ dissociation of SiC. Literature shows that an increase in the mechanical strength of these materials lowers their friction coefficient and wear rates. These works have studied steels with mechanical strength up to 800?MPa, but it is unclear if this trend continues with further increments of mechanical strengths. To tackle this question, self-lubricating steels with Ni and Mo were sintered, half of the samples with 8 wt-% Ni were treated cryogenically hardened. Results show that this trend does not escalate with mechanical strength, furthermore, when ductility is low, graphite reservoirs are not easily accessed, and lubrication is incomplete. Also, plastic deformation allows to better distribute the load of the counter body at the surface, which reduces the wear rates of the specimens and the counter bodies. |
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Keywords: | Self-lubricating steels cryogenic hardening Tribology metal injection moulding |
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