Results 1 to 10 of about 2,118 (231)
Modelling freckles and spurious grain formation in directionally solidified superalloy castings [PDF]
Communications MaterialsSegregation channels with misoriented spurious grains, known as freckles, are an unacceptable casting defect in superalloy turbine blades. A digital-twin method to predict segregation channels was proposed in our previous studies; however, the formation ...
Haijie Zhang +6 more
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Effects of Withdrawal Rate on the Microstructure of Directionally Solidified GH4720Li Superalloys. [PDF]
Materials (Basel), 2019 Increasing the ingot size of GH4720Li superalloys makes it difficult to control their microstructure, and the withdrawal rate is an important factor in controlling and refining the microstructure of GH4720Li superalloys. In this study, GH4720Li superalloy samples were prepared via Bridgman-type directional solidification with different withdrawal rates.
Qu J +5 more
europepmc +4 more sources
Tensile Deformation Behavior of a Directionally Solidified Superalloy at Cryogenic Temperatures
Crystals, 2022 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.
Xiaotong Guo +6 more
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Freckle Defect Formation near the Casting Interfaces of Directionally Solidified Superalloys. [PDF]
Materials (Basel), 2016 Freckle defects usually appear on the surface of castings and industrial ingots during the directional solidification process and most of them are located near the interface between the shell mold and superalloys. Ceramic cores create more interfaces in the directionally solidified (DS) and single crystal (SX) hollow turbine blades.
Hong J +7 more
europepmc +5 more sources
On the origin of mosaicity in directionally solidified Ni-base superalloys [PDF]
Acta Materialia, 2021 This article addresses the formation of low angle grain boundaries which give rise to mosaicity, a phenomenon which has only recently received attention in the single crystal Ni-base superalloy field. In this work, post-mortem advanced microscopy characterisation techniques are employed to deduce the dendrite tip growth kinetics from transverse ...
Joel Strickland +8 more
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Journal of Aeronautical Materials, 2021 High temperature aging treatment was first conducted on the rejuvenated directionally solidified superalloy to simulate the re-service aging damage of turbine blades and the virgin directionally solidified superalloy respectively.
TANG Wenshu +5 more
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Crystals, 2022 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)
Xiaotong Guo +5 more
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Cailiao gongcheng, 2016 In order to investigate the corrosion performance on intersecting and longitudinal surfaces of unoxidized and oxidized directionally solidified superalloys, Ni-base directionally solidified superalloy DZ125 and Co-base directionally solidified superalloy
MA Luo-ning, WANG Tian-you, ZHANG Zheng
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Frontiers in Materials, 2022 The investigation about the degradation behavior of turbine blades exposed to complex and extreme environments for long-term service is of great importance to assess the remaining life of the blades. In our work, the microstructure at different positions
Yadan Xie +4 more
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Formation Mechanism and Restraining Measures of Burning-on of DZ22B Directionally Solidified Blade
Journal of Aeronautical Materials, 2018 The microstructure and chemical composition of the burning-on layer of the directionally solidified blade of the DZ22B superalloy were studied by means of SEM and EDS.
LI Fei +6 more
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