Thermal Aging and the Hall–Petch Relationship of PM-HIP and Wrought Alloy 625
| Autor: | E. Getto, Keyou Mao, Brian Tobie, Esteban Bautista, Michael J. Pavel, David Gandy, Zachary T. Kroll, Alexander L. Bullens, Janelle P. Wharry |
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| Rok vydání: | 2019 |
| Předmět: |
Equiaxed crystals
Materials science Alloy Metallurgy 0211 other engineering and technologies General Engineering 02 engineering and technology Welding engineering.material Nanoindentation 021001 nanoscience & nanotechnology Forging law.invention law Hot isostatic pressing Powder metallurgy engineering General Materials Science 0210 nano-technology 021102 mining & metallurgy Grain boundary strengthening |
| Zdroj: | JOM. 71:2837-2845 |
| ISSN: | 1543-1851 1047-4838 |
| DOI: | 10.1007/s11837-019-03532-6 |
| Popis: | Powder metallurgy with hot isostatic pressing (PM-HIP) is an advanced alloy processing method capable of fabricating complex nuclear reactor components near-net shape, reducing the need for machining and welding. For heat exchangers and steam generators, thermal aging of PM-HIP materials must be comparable or superior to conventional castings or forgings. This study compares thermal aging effects in PM-HIP and wrought alloy 625. Isothermal aging is carried out over 400–800°C for 100 h. Both PM-HIP and wrought materials have equiaxed grains with a uniform orientation distribution. The PM-HIP material has finer grains than the wrought material at all aging conditions. Both PM-HIP and wrought materials have a comparable hardness and modulus measured by nanoindentation. Hardness remains unchanged with aging except the wrought material aged at 800°C, which exhibits softening. Overall, PM-HIP alloy 625 responds comparably to wrought alloy 625 and is superior at 800°C. Results are used to calculate a Hall–Petch coefficient. |
| Databáze: | OpenAIRE |
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