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Determination of Wetting Behavior, Spread Activation Energy, and Quench Severity of Bioquenchants

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Abstract

An investigation was conducted to study the suitability of vegetable oils such as sunflower, coconut, groundnut, castor, cashewnut shell (CNS), and palm oils as quench media (bioquenchants) for industrial heat treatment by assessing their wetting behavior and severity of quenching. The relaxation of contact angle was sharp during the initial stages, and it became gradual as the system approached equilibrium. The equilibrium contact angle decreased with increase in the temperature of the substrate and decrease in the viscosity of the quench medium. A comparison of the relaxation of the contact angle at various temperatures indicated the significant difference in spreading of oils having varying viscosity. The spread activation energy was determined using the Arrhenius type of equation. Oils with higher viscosity resulted in lower cooling rates. The quench severity of various oil media was determined by estimating heat-transfer coefficients using the lumped capacitance method. Activation energy for spreading determined using the wetting behavior of oils at various temperatures was in good agreement with the severity of quenching assessed by cooling curve analysis. A high quench severity is associated with oils having low spread activation energy.

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Authors and Affiliations

  1. Department of Metallurgical & Materials Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, 575 025, India

    K. Narayan Prabhu (Assistant Professor) & Peter Fernandes (Research Scholar)

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  1. K. Narayan Prabhu
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  2. Peter Fernandes
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Correspondence to K. Narayan Prabhu.

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Manuscript submitted December 23, 2006.

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Prabhu, K., Fernandes, P. Determination of Wetting Behavior, Spread Activation Energy, and Quench Severity of Bioquenchants. Metall Mater Trans B 38, 631–640 (2007). https://doi.org/10.1007/s11663-007-9060-3

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  • DOI: https://doi.org/10.1007/s11663-007-9060-3

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