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  • 1.
    Aranke, Omkar
    et al.
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Algenaid, Wael
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Awe, Samuel
    R and D Department, Automotive Components Floby AB, Floby, 52151, Sweden.
    Joshi, Shrikant V.
    University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Coatings for automotive gray cast iron brake discs: A review2019In: Coatings, ISSN 2079-6412, Vol. 9, no 9, article id 552Article in journal (Refereed)
    Abstract [en]

    Gray cast iron (GCI) is a popular automotive brake disc material by virtue of its high melting point as well as excellent heat storage and damping capability. GCI is also attractive because of its good castability and machinability, combined with its cost-effectiveness. Although several lightweight alloys have been explored as alternatives in an attempt to achieve weight reduction, their widespread use has been limited by low melting point and high inherent costs. Therefore, GCI is still the preferred material for brake discs due to its robust performance. However, poor corrosion resistance and excessive wear of brake disc material during service continue to be areas of concern, with the latter leading to brake emissions in the form of dust and particulate matter that have adverse effects on human health. With the exhaust emission norms becoming increasingly stringent, it is important to address the problem of brake disc wear without compromising the braking performance of the material. Surface treatment of GCI brake discs in the form of a suitable coating represents a promising solution to this problem. This paper reviews the different coating technologies and materials that have been traditionally used and examines the prospects of some emergent thermal spray technologies, along with the industrial implications of adopting them for brake disc applications. © 2019 by the authors.

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  • 2.
    Nordström, Michael
    et al.
    Saab Automobile AB.
    Järvstråt, Niklas
    University West, Department of Engineering Science, Division of Production Engineering.
    An appearance-based measure of surface defects2009In: International Journal of Material Forming, Vol. 2, no 2, p. 83-91Article in journal (Refereed)
  • 3.
    Tricarico, Luigi
    et al.
    DMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy.
    Ancona, Antonio
    University West, Department of Engineering Science, Division of Production Systems. CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy.
    Palumbo, Gianfranco
    DMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy.
    Sorgente, Donato
    NR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy; Università degli Studi della Basilicata, School of Engineering, Via Ateneo Lucano, 10, Potenza, 85100, Italy .
    Corizzo, Ottavio
    DMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy.
    Spina, Roberto
    DMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy.
    Lugara, Pietro Mario
    CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy; Università degli Studi e Politecnico di Bari, Dipartimento di Fisica, Via Amendola 173, Bari, 70126, Italy .
    Numerical and experimental investigation of the discrete spot laser hardening of a graphite-coated hypereutectoid steel using a fibre laser2019In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 104, no 1-4, p. 1393-1402Article in journal (Refereed)
    Abstract [en]

    The single-pulse laser hardening of a hypereutectoid steel coated by a graphite layer was investigated using a numerical/experimental approach. Experimental tests were conducted on coated samples using a fibre laser source and without any gas shielding aiming to explore the effect of laser power, pulse energy and defocusing distance on the dimensions of the hardened region. The process operating window of the discrete spot laser hardening using the graphite layer was determined through a finite element model and compared with previous results obtained on uncoated samples. For the same laser power and interaction times, an enlargement of the hardened region was found when using the graphite coating, especially when operating at the lowest laser energy level. The process operating window remains similar in shape to the one of the uncoated steel but moves towards larger hardened diameters and much larger defocusing distances. Once the maximum temperature has been fixed, a linear relationship between the hardened diameter and the defocusing distance exists. No obvious surface oxidation occurs since the graphite coating acts as a protective layer. © 2019, Springer-Verlag London Ltd., part of Springer Nature.

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