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The fluidized bed provides a means for exchanging heat between a metal part, the solid particles, and the fluidizing gas and which is viable for quenching. This article briefly considers the design aspects of the gas distributor, plenum, container, immersed cooling tubes and surface air spray cooling system in the quenching fluidized bed. It describes the fundamental factors affecting quenching power of the fluidized beds, namely, particle size, particle material, fluidizing gas composition, fluidizing gas flow rate, bed temperature and pressure, and the arrangement of quenched parts with respect to one another and to the bed. The article discusses the advantages, disadvantages, various applications and processes, including conventional batch quenching, two-step batch quenching, and continuous quenching of fluidized bed quenching, in detail.

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