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Mémoire de Maîtrise
DOI
Document
Auteur
Nom complet
Rafael Magalhães Triani
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Carlos, 2018
Directeur
Jury
Casteletti, Luiz Carlos (Président)
Coelho, Reginaldo Teixeira
Lombardi Neto, Amadeu
Titre en portugais
Produção e caracterização de camadas de boretos e carbonetos nos aços AISI 8620, 15B30, 8640 e 52100
Mots-clés en portugais
AISI 15B30
Boretação
Deposição termorreativa
Desgaste adesivo
Resumé en portugais
Os aços AISI 8620, 15B30, 8640 e 52100 são amplamente usados como componentes em rolamentos, engrenagens, pistões e discos de arado, estando sujeitos a constante contato relativo e, consequentemente, sobre diferentes formas de desgaste tribológico. O uso de tratamentos que produzam camadas duras e resistente ao desgaste podem aumentar significativamente o tempo em uso e reduzir custos operacionais. Neste trabalho, tais aços, foram submetidos a tratamentos de Boretação e Deposição termorreativa (TRD) e caracterizados por meio de ensaios de dureza, desgaste microadesivo e difração de raios - X. A dureza das camadas foram determinadas, ocorrendo aumento dessa propriedade para valores de 1650 a 1750 HK0.2 e 2000 a 2400 HK0.2 respectivamente para as camadas de boretos e carbonetos, já em relação ao desgaste microadesivo, as camadas de boretos, VC e NbC formadas apresentaram maior resistência ao desgaste quando comparadas aos seus respectivos substratos protegidos.
Titre en anglais
Production and characterization of boride and carbide layers on AISI 8620, 15B30, 8640 and 52100 steels
Mots-clés en anglais
Adhesive wear
AISI 15B30
Boride
Thermorreactive Deposition
Resumé en anglais
The AISI 8620, 15B30, 8640 and 52100 steels are widely used as components in bearings, gears, pistons and plow discs, being subject to constant relative contact and, consequently, to different forms of tribological wear. The use of treatments that produce hard layers and wear resistant can significantly increase the time in use and reduce operating costs. In this work, these steels were submitted to Boride and Thermorreative Deposition (TRD) treatments and characterized by tests of hardness, microadhesive wear and X - ray diffraction. The hardness of the layers was determined, increasing this property to values of 1650 to 1750 HK0.2 and 2000 to 2400 HK0.2 respectively for the layers of borides and carbides, already in relation to the microadhesive wear, the boride layers, VC and NbC formed presented higher resistance to wear when compared to their respective protected substrates.
 
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Date de Publication
2019-06-05
 
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