Comparative Thermal Aging Effects on PM-HIP and Forged Inconel 690
| Autor: | Keyou Mao, Nathaniel L. Vas, Nathan B. Cain, David Gandy, Alexander L. Bullens, Esteban Bautista, Janelle P. Wharry, Elizabeth H. Jaye |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Metallurgy General Engineering 02 engineering and technology Nanoindentation 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Forging Article Superalloy Grain growth Hot isostatic pressing Powder metallurgy 0103 physical sciences General Materials Science 0210 nano-technology Inconel |
| Zdroj: | JOM (1989) |
| Popis: | This study compares thermal aging effects in Inconel 690 (IN690) produced by forging and powder metallurgy with hot isostatic pressing (PM-HIP). Isothermal aging is carried out over 400-800°C for up to 1000 h and then metallography and nanoindentation are utilized to relate grain microstructure with hardness and yield strength. The PM-HIP IN690 maintains a constant grain size through all aging conditions, while the forged IN690 exhibits limited grain growth at the highest aging temperature and longest aging time. The PM-HIP IN690 exhibits comparable mechanical integrity as the forged material throughout aging: hardness and yield strength are unchanged with 100 h aging, but increase after 1000 h aging at all temperatures. In both the PM-HIP and forged IN690, the Hall-Petch relationship for Ni-based super-alloys predicts yield strength for 0-100 h aged specimens, but underestimates yield strength in the 1000 h aged specimens because of thermally induced precipitation. |
| Databáze: | OpenAIRE |
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