Thermodynamic Calculation and Analysis of Equilibrium Precipitated Phases in Mar-M247 Superalloy
Effects of alloying elements on the equilibrium precipitated phases, incipient and final melting temperature of Mar-M247 superalloy were studied through thermodynamic calculation. The results show that the main phases are γ' precipitates, MC, M<sub>6</sub>C, M<sub>23</sub&g...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Aeronautical Materials
2018-12-01
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| Series: | Journal of Aeronautical Materials |
| Subjects: | |
| Online Access: | http://jam.biam.ac.cn/CN/Y2018/V38/I6/19 |
| Summary: | Effects of alloying elements on the equilibrium precipitated phases, incipient and final melting temperature of Mar-M247 superalloy were studied through thermodynamic calculation. The results show that the main phases are γ' precipitates, MC, M<sub>6</sub>C, M<sub>23</sub>C<sub>6</sub> carbides, μ phases, MB<sub>2</sub> and M<sub>3</sub>B<sub>2</sub> borides. Hf and Ta segregate more seriously mostly during solidification process. Around the composition range, Cr, Mo, Ti and Hf influence the initial melting temperature mostly. Precipitation temperature and precipitation amount of carbides increase linearly with the increase of the C content. Furthermore, Hf, Ti and Ta are contributed to the precipitation of MC carbides, Cr improves the precipitation of M<sub>23</sub>C<sub>6</sub> and W and Mo are beneficial to the precipitation of M<sub>6</sub>C. The precipitation of μ phase is mainly influenced by Mo and W, the precipitation temperature and mass fraction of μ phase increase as the content of Mo and W increase. The precipitation behavior of γ' phase is affected by Al, Ti and Ta contents, and their effects decrease in turn. |
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| ISSN: | 1005-5053 1005-5053 |