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    Volume 5, Issue 4 (December 2016)

    Special Issue Paper

    Production and Characterization of Boride Coatings on Flame-Sprayed Martensitic Stainless Steel

    (Received 6 November 2015; accepted 29 January 2016)

    Published Online: 15 December 2016

    CODEN: MPCACD

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    Abstract

    Thermal spray is a process with many industrial applications in surface protection against wear and corrosion. The benefits of these processes include increased component life and decreased equipment downtime. However, sometimes an even greater wear resistance is required for optimal results. In such cases, a secondary treatment may be performed to produce a duplex coating. The objective of this work is to evaluate the wear resistance of a borided flame-sprayed duplex coating using an AISI 410 martensitic stainless steel alloy and a flame-spray process. The boriding treatment was performed at 950°C with 2- and 4-h treatment time in liquid borax in which 10 wt. % of aluminum was added. Optical microscopy, scanning electron microscopy, energy-dispersive x-ray spectroscopy, x-ray diffraction, and Vickers micro-hardness were used to analyze the samples. Micro-adhesive wear tests were performed to evaluate the wear resistance of the coatings using the fixed-ball method. The duplex coating exhibited superior wear resistance and hardness. The flame-sprayed coating layer exhibited a base hardness of about 450 HV, which was increased four times to about 1950 HV by including the boriding treatment. The thickness of the borided layer was approximately 50 μm.


    Author Information:

    Mariani, F. E.
    Universidade de São Paulo/Escola de Engenharia de São Carlos, Departamento de Engenharia de Materiais, Sao Paulo,

    Takeya, G. S.
    Universidade de São Paulo/Escola de Engenharia de São Carlos, Departamento de Engenharia de Materiais, Sao Paulo,

    Lombardi, Amadeu N.
    Universidade Tecnológica Federal do Paraná, Departamento de Engenharia Mecânica, Londrina, Parana

    Totten, G. E.
    Portland State Univ., Dept. of Mechanical and Materials Engineering, Portland, Oregon

    Casteletti, L. C.
    Universidade de São Paulo/Escola de Engenharia de São Carlos, Departamento de Engenharia de Materiais, Sao Paulo,


    Stock #: MPC20150065

    ISSN:2165-3992

    DOI: 10.1520/MPC20150065

    Author
    Title Production and Characterization of Boride Coatings on Flame-Sprayed Martensitic Stainless Steel
    Symposium ,
    Committee B08