Improvement of the Tribological Characteristics of AISI 8620, 8640 and 52100 Steels through Thermo-Reactive Treatments

Rafael  Magalhães Triani; Fábio  Edson Mariani; Lucas  Fuscaldi De Assis Gomes; Pedro  Gabriel Bonella De Oliveira; George  Edward Totten; Luiz  Carlos Casteletti

doi:10.3390/lubricants7080063

Lubricants (Jul 2019)

Improvement of the Tribological Characteristics of AISI 8620, 8640 and 52100 Steels through Thermo-Reactive Treatments

Rafael Magalhães Triani,
Fábio Edson Mariani,
Lucas Fuscaldi De Assis Gomes,
Pedro Gabriel Bonella De Oliveira,
George Edward Totten,
Luiz Carlos Casteletti

Affiliations

Rafael Magalhães Triani: Materials Engineering Department, São Carlos School of Engineering, University of São Paulo, São Carlos 13563-120, Brazil
Fábio Edson Mariani: Materials Engineering Department, São Carlos School of Engineering, University of São Paulo, São Carlos 13563-120, Brazil
Lucas Fuscaldi De Assis Gomes: Materials Engineering Department, São Carlos School of Engineering, University of São Paulo, São Carlos 13563-120, Brazil
Pedro Gabriel Bonella De Oliveira: Materials Engineering Department, São Carlos School of Engineering, University of São Paulo, São Carlos 13563-120, Brazil
George Edward Totten: Department of Mechanical and Materials Engineering, Portland State University, Portland, OR 97201, USA
Luiz Carlos Casteletti: Materials Engineering Department, São Carlos School of Engineering, University of São Paulo, São Carlos 13563-120, Brazil

DOI: https://doi.org/10.3390/lubricants7080063
Journal volume & issue: Vol. 7, no. 8
p. 63

Abstract

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The production of vanadium and niobium carbides (VC and NbC) layers on AISI 8620, 8640, and 52100 steels may increase hardness and wear resistance of substrates. Thermochemical treatments were performed at 1000 °C for 2 and 4 h. The characterization of the treated samples was carried out by means of Knoop microhardness tests, “calotest” type microadhesive wear test, layer adhesion test according to VDI 3198 standard, and X-ray diffraction. Compact and uniform layers of VC and NbC were obtained in all treatments, with hardness up to 2500 HK and microadhesive wear resistance far superior to that of the substrates, indicating the great efficiency of these treatments for tribological applications.

Published in Lubricants

ISSN: 2075-4442 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science
Website: http://www.mdpi.com/journal/lubricants

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