Creep resistance and material degradation of a candidate Ni–Mo–Cr corrosion resistant alloy
| Autor: | Massey de los Reyes, Guangzhou Yuan, Sachin L. Shrestha, Debes Bhattacharyya, Elizabeth Budzakoska-Testone, Zhijun J. Li, Michael Drew, Lyndon Edwards |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Misorientation Mechanical Engineering Metallurgy Diffusion creep Fracture mechanics 02 engineering and technology Intergranular corrosion 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Creep Mechanics of Materials 0103 physical sciences General Materials Science Grain boundary 0210 nano-technology Grain Boundary Sliding Electron backscatter diffraction |
| Zdroj: | Materials Science and Engineering: A. 674:64-75 |
| ISSN: | 0921-5093 |
| Popis: | This study investigated the creep deformation properties of GH3535, a Ni–Mo–Cr corrosion resistant structural alloy being considered for use in future Gen IV molten salt nuclear reactors (MSR) operating at around 700 °C. Creep testing of the alloy was conducted at 650–750 °C under applied stresses between 85–380 MPa. From the creep rupture results the long term creep strain and rupture life of the alloy were estimated by applying the Dorn Shepard and Larson Miller time-temperature parameters and the alloy's allowable ASME design stresses at the MSR's operating temperature were evaluated. The material's microstructural degradation at creep rupture was characterised using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The microstructural study revealed that the material failure was due to wedge cracking at triple grain boundary points and cavitation at coarse secondary grain boundary precipitates, nucleated and grown during high temperature exposure, leading to intergranular crack propagation. EBSD local misorientation maps clearly show that the root cause of cavitation and crack propagation was due to large strain localisation at the grain boundaries and triple points instigated by grain boundary sliding during creep deformation. This caused the grain boundary decohesion and subsequent material failure. |
| Databáze: | OpenAIRE |
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