Effect of microstructural anisotropy on fracture toughness of hot rolled 13Cr ODS steel – the role of primary and secondary cracking
| Autor: | Hans-Werner Viehrig, Eberhard Altstadt, Jan Hoffmann, C. Heintze, A. Das, Frank Bergner |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
Materials science fracture behaviour Fractography 02 engineering and technology anisotropy 01 natural sciences fractography delamination Fracture toughness 0103 physical sciences General Materials Science Texture (crystalline) bimodal microstructure Anisotropy secondary cracking 010302 applied physics Metallurgy Delamination ODS-steel Fracture mechanics 021001 nanoscience & nanotechnology Microstructure Nuclear Energy and Engineering Fracture (geology) 0210 nano-technology |
| Zdroj: | Journal of Nuclear Materials 491(2017), 83-93 |
| Popis: | ODS steels have been known to exhibit anisotropic fracture behaviour and form secondary cracks. In this work, the factors responsible for the anisotropic fracture behaviour have been investigated using scanning electron microscopy and electron backscatter microscopy. Fracture toughness of hot rolled 13Cr ODS steel was determined using unloading compliance method for L-T and T-L orientations at various temperatures. L-T orientation had higher fracture toughness than T-L orientation and also contained more pronounced secondary cracking. Secondary cracks appeared at lower loads than primary cracks in both orientations. Primary crack propagation was found to be preferentially through fine grains in a bimodal microstructure. Grains were aligned and elongated the most towards rolling direction followed by T and S directions resulting in fracture anisotropy. Crystallographic texture and preferential alignment of Ti enriched particles parallel to rolling direction also contributed towards fracture anisotropy. |
| Databáze: | OpenAIRE |
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