| Title： | Optimization of investment casting process for K477 superalloy aero-engine turbine nozzle by simulation and experiment | |
| Author： | Xin Hao1, 2, Guo-huai Liu3, *Ye Wang4, Shi-ping Wu5, and Zhao-dong Wang3 | |
| Address： | 1. AECC South Industry Company Limited, Zhuzhou 412002, Hunan, China; 2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China; 4. School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150001, China; 5. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | |
| Key words： | nickel-based superalloy; investment casting; shrinkage porosity; simulation; optimization | |
| CLC Nmuber： | TG146.1+5 | |
| Document Code： | A | |
| Article ID： | ||
| Abstract： |
In order to reduce the shrinkage porosity of nickel-based superalloy castings in the investment casting process, the effects of different gating systems on mold filling, solidification process, and prediction of shrinkage porosity of aero-engine turbine nozzle castings were investigated by simulation and experimental methods. Results show that the design of the vertical runner would cause greater turbulence of the melt in the riser during the mold filling process, and the outer runner is not necessary. With the decrease in number of runners, the hot spot moves down towards the casting, and the shrinkage and porosity defects are formed in the casting below the riser. In the original designs, a certain tendency of shrinkage and porosity defect is found in the vanes, inner rings, and outer rings of the castings by both simulation prediction and experiment. Finally, based on the processing optimization, the aero-engine turbine nozzle casting with no shrinkage and porosity defects is obtained.
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