Abstract
Immersion quenching in evaporable fluids like oil, polymer solutions, or water is a widely used technique in heat treatment shops because this technique provides higher heat transfer coefficients than the most alternative gas quenching techniques. The disadvantages of immersion quenching in evaporating fluids are the complex heat transfer mechanisms which consist of the three phases, film boiling, nucleate boiling, and convection. Especially the transition from film to nucleate boiling—the rewetting of the sample surface—is a complex process which leads to a strong position dependence of the heat transfer coefficient of the cooled work pieces. In particular, immersion quenching of thin-walled rings can result in large changes of ovality with comparable high scattering. To understand these results, two series of experiments were performed. Rings were quenched in oil in a special quenching tank and the rewetting behavior was documented. Furthermore, bearing races were quenched in a standard tank. Before and after heat treatment, these rings were measured by a coordinate measuring system and the distortion was determined. The investigations have clearly shown that the vapor film can have an important influence on distortion generation during oil quenching. The resulting distortion can principally be explained by the observed rewetting behavior.
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Acknowledgments
The authors gratefully acknowledge the financial support of the German Research Foundation (DFG) within the Collaborative Research Centre SFB 570 “Distortion Engineering” at the University of Bremen.
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Lübben, T., Frerichs, F. Influence of Rewetting Behavior on the Distortion of Bearing Races. J. of Materi Eng and Perform 22, 2323–2330 (2013). https://doi.org/10.1007/s11665-013-0501-7
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DOI: https://doi.org/10.1007/s11665-013-0501-7