Influencing Factors of Heat Transfer Coefficient in Air and Gas Quenching

    Volume 8, Issue 4 (April 2011)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 4 April 2011

    Page Count: 9


    Xiao, Bowang
    Center for Heat Treating Excellence (CHTE), Worcester Polytechnic Institute, Worcester, MA

    Wang, Gang
    Center for Heat Treating Excellence (CHTE), Worcester Polytechnic Institute, Worcester, MA

    Sisson, Richard D.
    Center for Heat Treating Excellence (CHTE), Worcester Polytechnic Institute, Worcester, MA

    Rong, Yiming
    Center for Heat Treating Excellence (CHTE), Worcester Polytechnic Institute, Worcester, MA

    (Received 21 September 2010; accepted 10 March 2011)

    Abstract

    Cooling rates of work pieces in heat treating processes heavily depend on the interfacial heat transfer coefficient (HTC) between work pieces and quenchants. Because the HTC plays an important role in the resulted distortion, residual stress, and mechanical property distributions, understanding how the HTC varies with respect to various influencing factors is of importance for an optimal quenching process. In this paper, the influencing factors such as air/gas velocity, pressure, temperature, gas mixture and part orientation, air/gas temperature, air humidity, surface roughness, oxide, and material to the variation of HTC are studied experimentally by using the Center for Heat Treating Excellence quenching system and theoretically by using empirical equations.


    Paper ID: JAI103403

    DOI: 10.1520/JAI103403

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    Author
    Title Influencing Factors of Heat Transfer Coefficient in Air and Gas Quenching
    Symposium 18th IFHTSE Congress, 2010-07-26
    Committee D20