Processing, Microstructures and Mechanical Properties of a Ni-Based Single Crystal Superalloy

Ding, Qingqing; Bei, Hongbin; Zhao, Xinbao; Gao, Yanfei; Zhang, Ze

doi:10.3390/cryst10070572

Cited by 30 publications

(11 citation statements)

References 38 publications

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“…As can be seen from Fig. 2, in sample A, the size of the γ' phase is not uniform and a small part is connected, and the degree of cube continues to decrease [12]. Fine secondary γ' phase begins to appear in the matrix channels.…”

Section: Microstructure Before Oxidationmentioning

confidence: 93%

Analysis of high temperature oxidation performance of DD6 under different aging treatment

Xie

Huang

et al. 2022

Preprint

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In accordance with the national standard HB 5258-83 "Antioxidant determination test method for steel and high temperature alloy", this paper implements high temperature oxidation performance tests of single crystal high temperature alloy. Three different heat-treated single crystal samples were oxidized at 900℃ and 1000℃ for 125h. The oxidative properties were determined by discontinuous weighing method and cyclic oxidation method. The oxidation of the sample after oxidation was analyzed by XRD, and SEM, EDS was used to study the composition and morphology of the surface of and longitudinal section of the sample. At 900℃ and 1000℃, the heat treatment of the sample with the best oxidation resistance is SHT + 1100℃/30min AC, and the heat treatment of the sample with the worst oxidation resistance is SHT + 1100℃/10min AC.

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Section: Microstructure Before Oxidationmentioning

confidence: 93%

Analysis of high temperature oxidation performance of DD6 under different aging treatment

Xie

Huang

et al. 2022

Preprint

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“…The nominal composition of the selected Ni‐based SX superalloy in this study is 4.2 Cr–8.8 Co–2.2 Mo–9.0 Ta–2.3 Re–0.5 Nb–5.1 Al–0.1 Hf–Ni (all in wt%). The fabrication processes of the SX superalloy are the same as those previously reported 20,25 . Briefly, the SX superalloy is grown by using the Bridgman method, and homogeneous γ/γ′ two‐phase microstructure is obtained after solid solution treatment (1290°C/1 h + 1300°C/2 h + 1315°C/2 h + 1325°C/4 h + 1330°C/4 h/air cooling [AC]) and subsequent two‐step aging treatment (1120°C/4 h/AC + 870°C/24 h/AC).…”

Section: Methodsmentioning

confidence: 99%

The dependence of stress and strain rate on the deformation behavior of a Ni‐based single crystal superalloy at 1050°C

Ding

Bei

et al. 2021

Int Journal of Mech Sys Dyn

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Ni-based single crystal (SX) superalloys are important high-temperature materials used for manufacturing turbine blades in aero-engines. During service under combinational impacts of temperature and stress, the SX superalloy may reach its life due to plastic deformation, which normally accompanies time-dependent microstructural degradation.To reveal this dynamically mechanical response, tensile tests at 1050°C are carried out to record stress-strain curves at five stain rates as well as creep curves at four applied stresses. Deformed microstructures and defects have been analyzed to understand mechanical behaviors and the underlying mechanism by using advanced scanning electron and scanning transmission electron microscopes. Results show that the deformation mode of the alloy strongly depends on the strain rates/applied stresses under mechanical loading. The dislocation density inside the γ phase is extremely low at all tests, indicating that the γ phase is relatively weak and ready to flow at this temperature even at a very fast strain rate. The deformation behavior of the γ′ phase is much complicated. At fast strain rates or high applied stresses, the dislocation density in the γ′ phase is very high, contributing to high-stress requirements to deform the material. At slow strain rates or low applied stresses, rafting microstructures develop and the deformation mode becomes directional coarsening/diffusion-dominated. Our results demonstrate a comprehensive understanding of the deformation mechanism of Ni-based SX superalloys, which may provide lifetime prediction of the mechanical failure, as well as the database for superalloy applications in mechanical systems.

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“…Nickel-based alloys are the most used alloys in the aerospace industry and its components as they can offer a higher chemical resistance, mechanical strength, and thermal conductivity compared to steels, for example [ 1 , 2 ]. Moreover, a great opportunity has arisen to produce parts for the aerospace sector with advanced performances made of nickel-based superalloys [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…Due to their excellent properties, these superalloys are very difficult to machine conventionally and the final surface integrity of a machined component can be affected [ 2 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

2021

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Particularly in the aerospace industry and its applications, recast layers and microcracks in base materials are considered to be undesirable side effects of the laser beam machining process, and can have a significant influence on the resulting material behavior and its properties. The paper deals with the evaluation of the affected areas of the Inconel 718 nickel-base superalloy after its drilling by a laser beam. In addition, measurements and analyses of the mechanical properties were performed to investigate how these material properties were affected. It is supposed that the mechanical properties of the base material will be negatively affected by this accompanying machining process phenomenon. As a verification method of the final mechanical properties of the material, static uniaxial tension tests were performed on experimental flat shape samples made of the same material (Inconel 718) and three different thicknesses (0.5/1.0/1.6 mm) which best represented the practical needs of aerospace sheet metal applications. There was one hole that was drilled with an angle of under 70° in the middle of the sample length. Additionally, there were several sets of samples for each material thickness that were drilled by both conventional and nonconventional methods to emphasize the effect of the recast layer on the base material. In total, 192 samples were evaluated within the experiment. Moreover, different tensile testing temperatures (room as 23 °C and elevated as 550 °C) were determined for all the circumstances of the individual experiments to simulate real operation load material behavior. As a result, the dependencies between the amount of the recast layer and the length of the microcracks observed after the material was machined by laser beam, and the decrease in the mechanical properties of the base material, were determined.

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Processing, Microstructures and Mechanical Properties of a Ni-Based Single Crystal Superalloy

Cited by 30 publications

References 38 publications

Analysis of high temperature oxidation performance of DD6 under different aging treatment

Analysis of high temperature oxidation performance of DD6 under different aging treatment

The dependence of stress and strain rate on the deformation behavior of a Ni‐based single crystal superalloy at 1050°C

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

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