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Multidisciplinary optimization of gas-quenching process

  • Heat Treating
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Abstract

Distortion as a result of the quenching process is predominantly due to the thermal gradient and phase transformations within the component. Compared with traditional liquid quenching, the thermal boundary conditions during gas quenching are relatively simple to control. By adjusting the gas-quenching furnace pressure, the flow speed, or the spray nozzle configuration, the heat-transfer coefficients can be designed in terms of both the component geometry and the quenching time. The purpose of this research is to apply the optimization methodology to design the gas-quenching process. The design objective is to minimize the distortion caused by quenching. Constraints on the average surface hardness, and its distribution and residual stress are imposed. The heat-transfer coefficients are used as design variables. DEFORM-HT is used to predict material response during quenching. The response surface method is used to obtain the analytical models of the objective function and constraints in terms of the design variables. Once the response surfaces of the objective and constraints are obtained, they are used to search for the optimum heat-transfer coefficients. This process is then used instead of the finite-element analysis. A one-gear blank case study is used to demonstrate the optimization scheme.

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Authors and Affiliations

  1. Department of Mechanical and Materials Engineering, Wright State University, 45435, Dayton, OH

    Zhickao Li & Ramana V. Grandhi

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  1. Zhickao Li
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  2. Ramana V. Grandhi
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Li, Z., Grandhi, R.V. Multidisciplinary optimization of gas-quenching process. J. of Materi Eng and Perform 14, 136–143 (2005). https://doi.org/10.1361/10599490522257

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  • DOI: https://doi.org/10.1361/10599490522257

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