| Autor: |
Stephane A. J. Forsik, Tao Wang, Austin D. Dicus, Gian A. Colombo, Ning Zhou, Mario E. Epler |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Superalloys 2020 ISBN: 9783030518332 |
| Popis: |
A new high-γ′ volume fraction Ni-base superalloy for additive manufacturing was developed using a CALPHAD-based approach. Selective laser melting followed by hot isostatic pressing produces a microstructure that is free of microcracks and fusion defects. Post-processing includes a solution-and-age heat treatment to precipitate about 55 vol.% of γ′. Two chemistries with different levels of grain boundary strengthening elements were tested to evaluate the balance between printability and high-temperature properties. After heat treatment, the alloy exhibits 980 MPa yield strength and 1400 MPa ultimate tensile strength at room temperature and maintains that level of yield strength up to 800 °C. Cyclic oxidation tests show good resistance to environmental damage due to the formation of a protective alumina layer. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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