Volume 8, Issue 4 (April 2011)

    Effect of Cooling Rate During Quenching on the Toughness of High Speed Steels

    (Received 14 October 2010; accepted 18 March 2011)

    Published Online: 2011

    CODEN: JAIOAD

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    Abstract

    High speed steels are usually employed in cutting tools and forming dies. Heat treatment is an important step during the tool manufacturing process, being responsible for most of the final properties, mainly hardness and toughness. In this context, an especial interest relies on the effect of hardening variables on mechanical properties and tool performance. The present paper aimed to study the effect of cooling rate during the quenching process of standard designation AISI M2 high speed steel, under typical industrial conditions. The experiments were carried out in an industrial vacuum furnace, with high pressure nitrogen quenching. Several cooling rates were obtained by variation of the nitrogen pressure and by the use of test specimens with different dimensions. Toughness results were mainly evaluated through static bend test. Low cooling rates were shown to decrease material toughness and large parts presented a decrease in mechanical properties from surface to core regions. Carbide precipitation on grain boundaries are pointed as the main explanation for all these effects.


    Author Information:

    Gonçalves, Cristiane Sales
    Materials Engineer, Technical Adviser, Villares Metals S.A.Department of Metallurgical and Materials Engineering, Polytechnic School–University of São Paulo, Sumaré, SP

    Slaviero, André Luiz
    Materials Engineer, Department of Metallurgical and Materials Engineering, Polytechnic School–University of São Paulo, São Paulo, SP

    Mesquita, Rafael Agnelli
    Department of Industrial Engineering, UNINOVE, São Paulo, SP

    Tschiptschin, André Paulo
    Department of Metallurgical and Materials Engineering, Polytechnic School–University of São Paulo, São Paulo, SP

    Haddad, Paulo de Tarso
    Supervisor of Technical Adviser, Metallurgical and Materials EngineeringVillares Metals S.A., Sumaré, SP


    Stock #: JAI103483

    ISSN: 1546-962X

    DOI: 10.1520/JAI103483

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    Author
    Title Effect of Cooling Rate During Quenching on the Toughness of High Speed Steels
    Symposium 18th IFHTSE Congress, 2010-07-26
    Committee A01