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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References
Liao J H, Bor H Y, Wei C N, et al. Influence of microstructure and its evolution on the mechanical behavior of modified MAR-M247 fine-grain superalloys at 871 °C. Materials Science and Engineering A, 2012, 539: 93–100.
Zhang J, Wang L, Wang D, et al. Recent progress in research and development of nickel-based single crystal superalloys. Acta Metallurgica Sinica, 2019, 55(9): 1077–1094. (In Chinese)
Wei C N, Bor H Y, Chang L. The effects of carbon content on the microstructure and elevated temperature tensile strength of a nickel-base superalloy. Materials Science and Engineering A, 2010, 527: 3741–3747.
Qi H Y, Yang J S, Yang X G, et al. Low-cycle fatigue behavior of a directionally solidified Ni-based superalloy subjected to gas hot corrosion pre-exposure. Rare Metals, 2019, 38(3): 227–232.
Liu L, Huang T, Xiong Y, et al. Grain refinement of superalloy K4169 by addition of refiners: Cast structure and refinement mechanisms. Materials Science and Engineering A, 2005, 394: 1–8.
Zhang Y B, Yang X L, Tang A. Corrosion behavior of nickel-based 718 alloy determined by in situ electrochemical methods at different partial pressures of H2S in 25wt% NaCl solution at 150 °C. Rare Metals, 2019, 38(9): 855–863.
Xu Z X, Su X L, Xu Q Y, et al. Numerical simulation on vacuum solution heat treatment and gas quenching process of a low rhenium-containing Ni-based single crystal turbine blade. China Foundry, 2016, 13(6): 402–413.
Xu Q Y, Yang C, Yan X W, et al. Development of numerical simulation in nickel-based superalloy turbine blade directional solidification. Acta Metallurgica Sinica, 2019, 55(9): 1175–1184. (In Chinese)
Tian J W, Bu K, Song J H, et al. Optimization of investment casting process parameters to reduce warpage of turbine blade platform in DD6 alloy. China Foundry, 2017, 14(6): 469–477.
Shen Y, Zheng G, Feng C M. Research progress of investment casting technology. Journal of Netshape Forming Engineering, 2019, 11(1): 54–62.
Li Z L, Xiong J C, Xu Q Y, et al. Deformation and recrystallization of single crestal nickel-based superalloys during investment casting. Journal of Materials Processing Technology, 2014, 217: 1–12.
Pattnaik S, Karunakar D B, Jha P K. Developments in investment casting process-A review. Journal of Material Processing Technology, 2012, 212: 2332–2348.
Sabau A S. Alloy shrinkage factors for the investment casting process. Metallurgical and Materials Transactions B, 2006, 37: 131–140.
Lamm M, Singer R F. The effect of casting conditions on the high-cycle fatigue properties of the single-crystal nickel-base superalloy PWA 1483. Metallurgical and Materials Transactions A, 2007, 38(6): 1177–1183.
Liu Y H, Kang M D, Wu Y, et al. Effects of microporosity and precipitates on the cracking behavior in polycrystalline superalloy Inconel 718. Materials Characterization, 2017, 132: 175–186.
Jiang R, Bull D J, Evangelou A, et al. Strain accumulation and fatigue crack initiation at pores and carbides in a SX superalloy at room temperature. International Journal of Fatigue, 2018, 114: 22–33.
Chen Q Z, Jones N, Knowles D M. The microstructures of base/modified RR2072 SX superalloys and their effects on creep properties at elevated temperatures. Acta Materialia, 2002, 50(5): 1095–1112.
Niu J P, Yin D M, Wang L, et al. Investment casting technology for the turbine blade. Special Casting & Nonferrous Alloys, 2019, 39(11): 1226–1229. (In Chinese)
Herlach D M, Eckler K, Karma A, et al. Grain refinement through fragmentation of dendrites in undercooled melts. Materials Science and Engineering A, 2001, 304–306: 20–25.
Fernández M C, Založnik M, Combeau H, et al. Thermosolutal convection and macrosegregation during directional solidification of TiAl alloys in centrifugal casting. International Journal of Heat and Mass Transfer, 2020, 154: 119698.
Sun Z Z, Hu H, Chen X. Numerical optimization of gating system parameters for a magnesium alloy casting with multiple performance characteristics. Journal of Materials Processing Technology, 2008, 199: 256–264.
Jie Z Q, Zhang J, Huang T W. Effects of grain refinement on cast structure and tensile properties of superalloy K4169 at high pouring temperature. China Foundry, 2016, 13(2): 101–106.
Wang Y, Wu S P, Xue X, et al. The formation mechanism and criterion of linear segregation in ZL205A alloy. Transactions of Nonferrous Metals Society of China, 2014, 24(11): 3632–3638.
Liu M F, Yao Z H, Dong J X. Application status of numerical simulation in precision forming of block casting turbine. Journal of Netshape Forming Engineering, 2021, 13(1): 35–43.
Wang Y, Wu S P, Niu L J, et al. Optimization of low-pressure die casting process parameters for reduction of shrinkage porosity in ZL205A alloy casting using Taguchi method. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2014, 228(11): 1508–1514.
Wei Y P, Yu B, Yang Q Z, et al. Numerical simulation and experimental validation on fabrication of nickel-based superalloy Kagome lattice sandwich structures. China Foundry, 2020, 17(1): 21–28.
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Ye Wang Male, Ph.D. His research interests mainly focus on numerical simulation of heat and mass transfer and defect predication during the mould filling and solidification process of metal melt. E-mail: ohenry1980@163.com
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Hao, X., Liu, Gh., Wang, Y. et al. Optimization of investment casting process for K477 superalloy aero-engine turbine nozzle by simulation and experiment. China Foundry 19, 351–358 (2022). https://doi.org/10.1007/s41230-022-1092-4
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DOI: https://doi.org/10.1007/s41230-022-1092-4