Effect of solution treatment on microstructure and tensile properties of a U720LI Ni-based superalloy
| Autor: | Yu Sun, Zhao Li, Zhipeng Wan, Lianxi Hu, Tao Wang, Yong Zhang |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Coalescence (physics) Materials science 02 engineering and technology Intergranular corrosion 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Surfaces Coatings and Films Superalloy Brittleness 0103 physical sciences Ultimate tensile strength Composite material 0210 nano-technology Ductility Instrumentation Tensile testing |
| Zdroj: | Vacuum. 156:248-255 |
| ISSN: | 0042-207X |
| Popis: | The effect of solution treatment in a range from 1130 °C to 1150 °C on the microstructure and tensile properties of an as-forged U720LI superalloy was investigated under various temperatures between room temperature and 750 °C of tensile tests. It was revealed that a high solution treatment temperature leads to coarsening of grains and secondary gamma prime precipitates, and thus decreases of room temperature and 400 °C strength and ductility. A combination of ductile and brittle mode characterized by dimples and quasi-cleavage facets feature was observed for 1130 °C and 1140 °C solution treatment. The initiation and coalescence of microvoids at the interface of matrix and precipitates as well as the planar-slip process promoted the formation of quasi-cleavage fracture. In addition, a mixed intergranular and transgranular quasi-cleavage fracture with some dimples features for 1150 °C solution treatment was also identified under 750 °C tensile test. |
| Databáze: | OpenAIRE |
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