1. Temperature dependence tensile behaviors of additively manufactured GH4099 Ni-based superalloy.
- Author
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Nie, Zhenhua, Guo, Qianying, Zhao, Yanan, Ma, Zongqing, and Liu, Yongchang
- Subjects
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HEAT resistant alloys , *EXTREME environments , *DUCTILE fractures , *CRYSTAL grain boundaries , *TEMPERATURE , *BRITTLENESS - Abstract
Additive manufacturing was currently widely used to fabricate complex-shaped superalloy components for extreme environment applications. To replace the components prepared by the traditional approaches, it is crucial to ensure the reliability of AMed superalloys, especially in a thermal-stress environment. In this work, the high-temperature tensile properties of AMed GH4099 nickel-based superalloy are studied to establish the relationships among deformation temperatures, mechanisms, and failure responses. The results show that the deformation mechanisms at 600 °C are mainly cross-slip of the slip bands and arrays, which induced a ductile fracture. Increasing the tensile temperature will cause a shift of the dislocation movement from cross-slip to Orowan looping and stacking fault shearing to dislocation entangles-recovery-recrystallization, and the fracture mode transformed from pure ductile to mixed ductile-brittle. Additionally, the neighboring grain boundaries and the carbide-grain boundary bondings will also change with the temperature, which is further linked to the mediate-temperature brittleness and high-temperature abnormal plasticity of this superalloy. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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