Prediction of Grain Formation and Defects during Solidification in Single Crystal Superalloy Castings
| Autor: | Hai Peng Jin, Jia Rong Li, Hong Ji Xie, Shi Zhong Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Mechanics of Materials Mechanical Engineering 0103 physical sciences Metallurgy General Materials Science 02 engineering and technology 021001 nanoscience & nanotechnology 0210 nano-technology Condensed Matter Physics 01 natural sciences Single crystal superalloy |
| Zdroj: | Materials Science Forum. 1035:819-826 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.1035.819 |
| Popis: | Numerical simulation and prediction of grain formation and defects, including the stray grain and high angle orientation deviation during directional solidification process of a single crystal superalloy hollow turbine blade are experimentally conducted by means of commercial software ProCAST and backscattering scanning electron microscope. The results show that the initial nucleation amount at the beginning section of the starter block is 104 of magnitude, and the number of grains decreases gradually with the competitive growth, and the number is about 100 at the spiral of the selector. And the orientation distribution of grains is close to direction, with the orientation deviation between 10° and 15°. Moreover, with the increase of withdrawal rate, the curvature of isoline of liquidus of single crystal blade increases, and the tendency to form stray grains defects increases. The grain with a large deviation from orientation blocks the growth of other grains at the first rotating transition site of the selector, and then gradually grows and solidifies to form the final blade. |
| Databáze: | OpenAIRE |
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