| Autor: |
Stephane A. J. Forsik, Gareth G.E. Seward, Ning Zhou, Chris J. Torbet, Tresa M. Pollock, Andrew T. Polonsky, Ryan R. Dehoff, William E Slye, Kira Pusch, Peeyush Nandwana, Michael M. Kirka, Sean P. Murray |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Superalloys 2020 ISBN: 9783030518332 |
| Popis: |
Successful application of selective electron beam melting to a novel CoNi-based superalloy named SB-CoNi-10 is demonstrated. Crack-free as-printed microstructures exhibit excellent ductilities above 30% and ultimate tensile strengths above 1.1 GPa at room temperature in tension. Conventional post-processing consisting of a super-solvus hot isostatic pressing (HIP), a solution heat treatment (SHT), and a low-temperature aging has been applied to remove microstructural inhomogeneities present in the as-printed microstructure. The microstructures of the as-printed and HIP+SHT+Aged alloys have been investigated to determine the effect of post-processing heat treatments on the nanoscale \(\gamma \)/\(\gamma ^{\prime }\) microstructure and the mesoscale grain structure. Tensile tests have been conducted at room temperature and elevated temperatures above 850 \(^{\circ }\)C to investigate mechanical properties in both the as-printed and HIP+SHT+Aged conditions. The high-temperature ductility and strength are strongly affected by the microstructure, with a mostly columnar-grained microstructure in the as-printed condition exhibiting superior ductility to the fully recrystallized microstructure in the HIP+SHT+Aged condition. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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