Effect of Solution Heat Treatment on Microstructures and Stress Rupture Properties of DZ406 Alloy

Xing, Weijie; Liu, Changkui; Guo, Xiaotong; Zhu, Gang; Zhao, Wenxia; Zuo, Xinlang; Zheng, Zhen

doi:10.1007/978-3-030-67958-3_43

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…It is worth noting that this high temperature deformation mechanism is generally accepted for the DZ406 alloy, for example, the creep voids are all located at the interfaces of the MC carbides and γ matrix during high temperature creep [15]. Generally, the dimples are nucleated, grown, aggregated and finally connected with each other, resulting in plastic fracture [16,17]. The carbides with a smaller size were more conducive to the generation of dimples, as shown in the Figure 2e,f.…”

Section: Macroscopic Fracturementioning

confidence: 96%

Tensile Deformation Behavior of a Directionally Solidified Superalloy at Cryogenic Temperatures

Guo

Wang³

et al. 2022

Crystals

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Ni-based superalloys are widely used to manufacture gas turbine core components, but reports on the reliability of superalloys at cryogenic temperatures are still limited. Considering the actual application of superalloys in the field of cryogenic temperature, the tensile deformation behavior of directionally solidified superalloy DZ406 was investigated at cryogenic temperatures from −125 °C to 25 °C, and the comparative analysis of room temperature and 1000 °C was carried out. The yield strength and ultimate strength at cryogenic temperatures were close to that at room temperature, and twice that at 1000 °C. The elongation was maintained at 10–15% and exhibited a certain plasticity at cryogenic temperatures. The morphologies and chemical composition of γ′ precipitates were close at cryogenic temperatures, room temperature and 1000 °C. The microstructure difference that was caused by different temperatures was mainly reflected in the fracture mode and dislocation configuration. At cryogenic temperature, the fracture samples basically exhibited no necking phenomenon, and the cracks were basically located in the interdendritic regions and occurred in MC carbide itself; at room temperature and 1000 °C, dimples with carbides inside were distributed on the fracture surface. Slip bands and dislocations contributed to the tensile deformation at cryogenic temperatures and room temperature, while only the dislocations worked at 1000 °C.

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Section: Macroscopic Fracturementioning

confidence: 96%

Tensile Deformation Behavior of a Directionally Solidified Superalloy at Cryogenic Temperatures

Guo

Wang³

et al. 2022

Crystals

Self Cite

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Effect of Service-Induced Degradation on Residual Stress Rupture Life of a Directionally Solidified Superalloy

et al. 2022

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The influence of service-induced degradation on residual life is very important for the safe service of turbine blades. In this study, a series of simulation experiments were conducted on a directionally solidified superalloy under (880–1020) °C/(70–220) MPa and interrupted after 500 h. Then, the stress rupture life of the interrupted specimens was tested under 980 °C/275 MPa. The results showed that the increase of simulated experiment temperature decreased the residual stress rupture life. In brief, the simulation experiments at 880 °C did not influence the residual stress rupture life of the alloy. The simulated experiments at 980 °C and 1050 °C mainly affected the microstructure of γ’ phase, while not γ/γ’ eutectic and carbides. After the stress rupture tests under 980 °C/275 MPa, cracks were located at the interfaces between carbides and γ matrix in the interdendritic regions. This study provides guidance on the degradation evaluation and safety service of the directionally solidified superalloys.

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Effect of Solution Heat Treatment on Microstructures and Stress Rupture Properties of DZ406 Alloy

Cited by 2 publications

References 18 publications

Tensile Deformation Behavior of a Directionally Solidified Superalloy at Cryogenic Temperatures

Tensile Deformation Behavior of a Directionally Solidified Superalloy at Cryogenic Temperatures

Effect of Service-Induced Degradation on Residual Stress Rupture Life of a Directionally Solidified Superalloy

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