Microstructural Stability During Creep Exposure of 9Cr-1Mo Steel Treated at Different Normalization Temperatures
| Autor: | Debalay Chakrabarti, Pranabananda Modak, Arya Chatterjee, Kaustav Barat, Rahul Mitra |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Normalization (statistics) Materials science Misorientation Mechanical Engineering 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Creep strain Creep Mechanics of Materials Martensite 0103 physical sciences General Materials Science Tempering Composite material 0210 nano-technology Electron backscatter diffraction |
| Zdroj: | Journal of Materials Engineering and Performance. 28:3076-3093 |
| ISSN: | 1544-1024 1059-9495 |
| Popis: | A modified 9Cr-1Mo steel has been exposed to three separate austenitization temperatures, i.e., at 950, 1025, and 1100 °C for normalization. After subsequent tempering at 750 °C, the normalized and tempered samples were creep-tested at temperatures of 550, 600, and 650 °C. The creep strength of the investigated samples was evaluated in terms of minimum creep strain rate and time to rupture. The effects of microstructure, precipitate and boundary misorientation on the creep behavior of the samples have been studied with TEM and EBSD analyses. Further, the evolution of crystallographic texture after creep tests has also been studied. The presence of an intermediate size of martensitic microstructural units (i.e., prior-austenite grain, martensitic packets, etc.) and combination of fine coherent and incoherent Nb(C,N) precipitates has provided superior creep strength for the samples normalized at 1025 °C, when these are subsequently subjected to low-temperature (i.e., 550 °C) and high-temperature (i.e., 650 °C) creep tests, as compared to other conditions of normalizing heat treatment. |
| Databáze: | OpenAIRE |
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