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Abstract

The effect of fluidised bed parameters on quenching efficiency was examined on two steels for various section sizes. Heat transfer coefficients were determined and the microstructure of some sections was examined. It was found that the heat removal rate by the fluidised bed lies between those of air and oil quenching and a martensitic structure was observed in quenched sections. The fluidising velocity affects greatly the heat transfer coefficient h between the bed and the cooled section. The value of h increases with the velocity to a maximum and then decreases. Higher values of h are obtained in beds of fine particles and wide particle size distribution. The bed/cooled section diameter ratio has an important effect on the heat removal rate. The treated section should be immersed well below the bed surface.

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Effect of fluidised bed parameters on quenching of steel sections

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