Development of a Low‐Cost Third Generation Single Crystal Superalloy DD9

Li, J.R.; Liu, S.Z.; Wang, X.G.; Shi, Zhen-xue; Zhao, Jianguo

doi:10.1002/9781119075646.ch6

Cited by 11 publications

(20 citation statements)

References 3 publications

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“…During the development of single crystal superalloys, the refractory element content in the alloy shows an increasing trend [3]. However, the third generation and beyond of single crystal superalloys exhibit more than 20wt.% of refractory elements such as W, Mo, Ta, Re, and Nb [4][5][6][7][8][9]. Because all these refractory elements are transition group elements with unsaturated d-electron layers, their increase will augment the precipitation tendency of topologically close-packed (TCP) phases in these alloys.…”

Section: Introductionmentioning

confidence: 99%

Process Optimization Method for Inhibiting TCP Precipitation in A Nickel-Based Single Crystal Superalloy with High Refractory Element Content

Yue,

Wang,

Zhao

et al. 2023

J. Phys.: Conf. Ser.

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In order to study the optimization method of microstructure stability of high generation single crystal superalloys, the influence of manufacturing process on the microstructure stability of a single crystal superalloy containing high content of refractory elements was studied, and the corresponding process optimization method was obtained. The microstructure characteristics of the alloy at different stages were observed and the corresponding element distribution were tested. The microstructure and element distribution of the alloy at different stages of preparation were analyzed with the assistance of kinetic calculation. Results show that the element dendrite segregation is an important reason to reduce microstructural stability. Reducing the dendrite spacing in directional solidification and increasing element diffusion in solid solution heat treatment can reduce the segregation of refractory elements in the dendrite core. As a result, less TCP precipitates in the dendrite core, and thus improve microstructure stability. Based on analyzed results, the manufacturing process were optimized and proved to be effective.

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Section: Introductionmentioning

confidence: 99%

Process Optimization Method for Inhibiting TCP Precipitation in A Nickel-Based Single Crystal Superalloy with High Refractory Element Content

Yue,

Wang,

Zhao

et al. 2023

J. Phys.: Conf. Ser.

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“…Due to the high ambient temperature and high stress of high temperature parts, Matrensitic heatresistant steel can easily lose effectiveness during the pricess. Therefore, improving the performance of martensitic heat-resistant steel remains the key to improvement on work efficiency and service life [10].…”

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation Behavior of New Martensitic Heat-Resistant Steel

Bao

Han

Zhu

et al. 2022

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The research focuses on the high temperature oxidation resistance of martensitic heat-resistant steel. A new type of martensitic heat-resistant steel was developed with the addition of Al and Cu, and the oxidation behavior of the new martensitic heat-resistant steel at 650 °C and 700 °C was analyzed. The high temperature oxidation kinetics curves of new martensitic heat-resistant steel at 650 °C and 700 °C were determined and plotted by cyclic oxidation experiment and discontinuous weighing method. XRD technique was applied to qualitatively analyze the surface oxide of the material after oxidation. The surface and cross-section morphology of the material were observed by field emission scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), and the oxidation mechanism at high temperature was analyzed. The results show that the oxide film can be divided into two layers after oxidation at 650 ºC for 200 h. The outer oxide film is mainly composed of Fe and Cu oxides, and the inner oxide film is mainly composed of Al2O3, SiO2 and Cr2O3. After oxidation at 700 ºC for 200 h, the outer layer is mainly composed of Fe, Cu, Mn oxides, and the inner layer is mainly composed of Cr, Al and Si oxides. The addition of a small amount of Cu promotes the diffusion of Al and Si elements, facilitates the formation of Al2O3 and SiO2, and improves the high-temperature oxidation resistance of martensitic heat-resistant steel.

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“…The alloying elements of a Ni-based SX superalloy include aluminium, chromium, cobalt, molybdenum, rhenium, ruthenium, tantalum, titanium, and tungsten [22]. The two phases ( and ) that constitute the microstructure of a typical heat-treated Ni-based SX superalloy are shown in Figure 2-8 [119].…”

Section: Research Status On Am Of Ss316l Alloymentioning

confidence: 99%

“…The development of Ni-based SX superalloys over the course of history implies that the later generations of superalloys, though promise quite significant increase in creep strength over first-generation superalloys, require extreme care in terms of balancing the heavy elements in the γ phase to avoid the formation of defects like Topologically Closed Packed (TCP) phases [119,126] and Secondary Reaction Zones (SRZs) [127] Along with these advancements, significant improvements are due in the conventional manufacturing process of Ni-based SX superalloys [130].…”

Section: Topologically Close-packed (Tcp) Phasementioning

confidence: 99%

“…The entire process of directional solidification with crystal seeding or grain selection is relatively simple in theory, though its application to obtain an SX part, suitable for industrial application is another story. Defects arising in directional solidification such as stray grain formation, grain misorientation, and high-angle grain boundaries (formed due to recrystallization during heat treatment [119,134]), along with the tight tolerances in terms of weight, dimensions, and application, results in low yield rate and adds on to the overall cost of manufacturing a gas turbine. Statistical analysis of the conventional manufacturing process shows that the percentage yield obtained, due to various defects associated with the traditional process of fabrication, remains below 70 % even for industry significant third-generation superalloys [22].…”

Section: Limitations Of the Conventional Manufacturing Processesmentioning

confidence: 99%

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Investigation of grain growth and microstructural evolution in electron beam melting additive manufacturing process

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Development of a Low‐Cost Third Generation Single Crystal Superalloy DD9

Cited by 11 publications

References 3 publications

Process Optimization Method for Inhibiting TCP Precipitation in A Nickel-Based Single Crystal Superalloy with High Refractory Element Content

Process Optimization Method for Inhibiting TCP Precipitation in A Nickel-Based Single Crystal Superalloy with High Refractory Element Content

High Temperature Oxidation Behavior of New Martensitic Heat-Resistant Steel

Investigation of grain growth and microstructural evolution in electron beam melting additive manufacturing process

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