Gamma prime stability and its influence on tensile behavior of a wrought superalloy with different Fe contents
| Autor: | Jian Ting Guo, Yong An Guo, Chang Shuai Wang, Lanzhang Zhou |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Ostwald ripening Materials science Mechanical Engineering Alloy Kinetics Metallurgy 02 engineering and technology Activation energy engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Superalloy symbols.namesake Mechanics of Materials Phase (matter) 0103 physical sciences Thermal Ultimate tensile strength engineering symbols General Materials Science 0210 nano-technology |
| Zdroj: | Journal of Materials Research. 31:1361-1371 |
| ISSN: | 2044-5326 0884-2914 |
| Popis: | Gamma prime (γ′) stability and its influence on tensile behavior of a newly developed wrought superalloy with various Fe contents was studied both experimentally and thermodynamically. The results show that the γ′-solvus temperature is higher and γ–γ′ lattice mismatch is bigger in the alloy with the lower Fe content. During long-term thermal exposure at 650–750 °C, the coarsening behavior of γ′ precipitates follows Ostwald ripening kinetics and the lower Fe content can decrease the coarsening rate of γ′ precipitates due to the increase of the activation energy for γ′ coarsening. Moreover, the lower Fe content can retard the transformation from γ′ to η phase. The tensile properties of the alloys with different Fe contents are almost same after standard heat treatment. However, after thermal exposure, the decrease of tensile strength in the alloy with lower Fe content is less than that of the alloys with higher Fe content due to the improvement of γ′ stability. |
| Databáze: | OpenAIRE |
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