Spray quenching processes in heat treatment processes of specimen and components demonstrated its efficiency and potential of direct in-process integration in applications as forging or sheet metal forming. Ensuring local quenching homogeneity and offering a range of quenching intensities, spray-quenching provides optimal solutions to carry out energy-efficient, homogeneous and intensive heat treatment processes. In this contribution, spray quenching of specimen using twin-fluid, flat-spray nozzles is evaluated in order to integrate the heat treatment process within an automated production line of forging or forming components. The quenching strategies firstly aim at providing appropriate microstructures (homogeneous and bainitic) to forged metallic parts of various geometries. Experiments and simulations are carried out to derive optimal cooling strategies. Temperature-dependent heat transfer coefficient (HTC) distributions based on a parameter study of the spray nozzle involving thermography have been evaluated. Transient heat transport simulations where the components are quenched according to local and dynamic HTC distribution using various arrangements of the nozzle field were performed. It is shown that the a priori simulated process parameters provided homogeneous microstructures in the components. The characteristic specimen geometries under investigation range from flat plates to cylindrical parts as e.g. stepped shafts. The possibility to extend spray quenching to more complex-shaped specimen geometries is outlined.
- Fluids Engineering Division
Spray-Quenching for Process-Integrated Heat Treatment of Construction Components
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Bucquet, T, & Fritsching, U. "Spray-Quenching for Process-Integrated Heat Treatment of Construction Components." Proceedings of the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1C, Symposia: Fundamental Issues and Perspectives in Fluid Mechanics; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Gas-Solid Flows: Dedicated to the Memory of Professor Clayton T. Crowe; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes. Chicago, Illinois, USA. August 3–7, 2014. V01CT16A016. ASME. https://doi.org/10.1115/FEDSM2014-21858
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