Investigation of Batch Intensive Quenching Processes When Using Hydrodynamic Emitters in Quench Tanks

Abstract

The paper discusses patented in Ukraine a new intensive quenching IQ–2 technology based on film boiling resonance effect [1]. Namely, the paper discusses improving of the batch intensive quenching (IQ) process known as IQ-2 method by the use of hydrodynamic emitters installed in quench tanks. The hydrodynamic emitters produce oscillating waves in the quench media with the frequency of the film boiling process creating a resonance effect. Two- and three-step IQ-2 processes are considered. Specifics of the heat transfer during the IQ-2 process are presented with focusing on the first stage of quenching where film and nucleate boiling processes are taking place. Examples of production IQ-2 equipment and loads processed are also presented. Application of hydrodynamic emitters in the IQ water tanks in addition to currently used propellers is considered in details. It is shown that the proposed new method can fully eliminate the film boiling process resulting in significant reduction of part distortion during quenching. Further evaluation of the proposed method is needed for its implementation in heat treating practice.

FEM modeling and experimental validation of quench-induced distortions of large size steel forgings

“…At this stage, a good correlation between the temperature and displacement fields could be observed, indicating that the shrinking of the block was driven by thermal stresses. T. Lübben, et al (2014) reported that the temperature difference ΔT = (Tmax -Tmin) between the coldest and hottest zones could be correlated to the intensity of thermal stresses [48,49]. Results reported in Figure 13 also reveal that due to high heat removal, the edges were the first elements to experience Ms temperature [19,23] and build a rigid frame composed of hard martensitic layers.…”

Investigation of Transient Nucleate Boiling Processes and Their Practical Use in Heat Treating Industry

“…As a result, customizers face some problems connected with distortion issues because in many cases cooling should be interrupted at proper time to prevent non-uniformity of cooling during quenching as shown Fig. 6 [16,17]. A methodology is developed for testing liquid media as a quenchant and results of testing can be successfully used for recipes development.…”