Creep behaviour and life assessment of a cast nickel – base superalloy MAR – M247
| Autor: | Vaclav Sklenicka, Karel Hrbáček, Jiri Dvorak, Petr Král, Marie Kvapilová |
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| Rok vydání: | 2019 |
| Předmět: |
Technology
Materials science 0211 other engineering and technologies Nickel base Chemicals: Manufacture use etc TP1-1185 02 engineering and technology creep deformation mechanisms life assessment mar-m247 superalloy General Materials Science Physical and Theoretical Chemistry 021102 mining & metallurgy Materials processing Chemical technology Metallurgy TP200-248 021001 nanoscience & nanotechnology Condensed Matter Physics Superalloy 81.05.bx Creep Deformation mechanism Mechanics of Materials Life assessment 0210 nano-technology |
| Zdroj: | High Temperature Materials and Processes, Vol 38, Iss 2019, Pp 590-600 (2019) |
| ISSN: | 2191-0324 0334-6455 |
| Popis: | The cast nickel-base MAR-M247 superalloy has been widely used for high-temperature components. In this work, the creep behaviour of two alternates of MAR-M247 superalloy with different grain size processed at different temperatures of casting are compared. Under the creep testing conditions used in this study, only negligible differences of creep behaviour of the alternate alloys were found and the evaluated creep characteristics correspond to the power-law or dislocation creep. The microstructure of the alloys consists of a 𝛾 matrix with a eutectic, 𝛾' strengthening cubic precipitates, and M6C and M23C6 carbides. Increasing the temperature induces the dissolution of some M23C6 carbides. Fractures of both variants of alloys exhibit a more ductile character at higher temperatures, while at lower temperature a mixture of brittle and ductile fracture modes was observed, which changes the creep fracture ductility. |
| Databáze: | OpenAIRE |
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