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| Modeling and Control of Porosity Defects in Nickel-Based Single Crystal Superalloys: A Review |
| LIU Keli1 , WANG Junsheng 1,2, GUO Yueling2 , YANG Yanhong3 , ZHOU Yizhou3 , YANG Yuansheng3 |
| (1. School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China; 2. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China; 3. Research Department of Superalloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China) |
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Abstract Nickel-based single crystal superalloy is one of the key materials for turbine blades used for current aeroengines. The porosity defect has a significant influence on the reliability and durability of turbine blades. Conventional experimental analysis is often limited by qualitative rules. Recent developments of numerical simulation and threedimensional characterization techniques facilitate to reveal the formation and evolution mechanisms of porosity defects in Ni-based single crystal superalloys and precisely predict their geometrical features, distribution, and volume fraction. Here we review the research progress on the numerical simulation of porosity defects, and discuss the features of current porosity prediction models. To provide possible guidances for multiscale modeling of porosity formation in nickel-based single crystal superalloys, the potential barriers that prevent quantitative prediction and control of porosity defects from casting to final service are proposed.
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2020, 
