Numerical Simulation and Optimization of Directional Solidification Process of Single Crystal Superalloy Casting
Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Materials 2014, 7(3), 1625-1639; https://doi.org/10.3390/ma7031625
Received: 17 December 2013
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Revised: 19 February 2014
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Accepted: 21 February 2014
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Published: 28 February 2014
The rapid development of numerical modeling techniques has led to more accurate results in modeling metal solidification processes. In this study, the cellular automaton-finite difference (CA-FD) method was used to simulate the directional solidification (DS) process of single crystal (SX) superalloy blade samples. Experiments were carried out to validate the simulation results. Meanwhile, an intelligent model based on fuzzy control theory was built to optimize the complicate DS process. Several key parameters, such as mushy zone width and temperature difference at the cast-mold interface, were recognized as the input variables. The input variables were functioned with the multivariable fuzzy rule to get the output adjustment of withdrawal rate (v) (a key technological parameter). The multivariable fuzzy rule was built, based on the structure feature of casting, such as the relationship between section area, and the delay time of the temperature change response by changing v, and the professional experience of the operator as well. Then, the fuzzy controlling model coupled with CA-FD method could be used to optimize v in real-time during the manufacturing process. The optimized process was proven to be more flexible and adaptive for a steady and stray-grain free DS process.
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Keywords:
numerical simulation; directional solidification; single crystal superalloy; fuzzy controlling strategy
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MDPI and ACS Style
Zhang, H.; Xu, Q.; Liu, B. Numerical Simulation and Optimization of Directional Solidification Process of Single Crystal Superalloy Casting. Materials 2014, 7, 1625-1639. https://doi.org/10.3390/ma7031625
AMA Style
Zhang H, Xu Q, Liu B. Numerical Simulation and Optimization of Directional Solidification Process of Single Crystal Superalloy Casting. Materials. 2014; 7(3):1625-1639. https://doi.org/10.3390/ma7031625
Chicago/Turabian StyleZhang, Hang, Qingyan Xu, and Baicheng Liu. 2014. "Numerical Simulation and Optimization of Directional Solidification Process of Single Crystal Superalloy Casting" Materials 7, no. 3: 1625-1639. https://doi.org/10.3390/ma7031625
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