Design of an Eta-Phase Precipitation-Hardenable Nickel-Based Alloy with the Potential for Improved Creep Strength Above 1023 K (750 °C)

Wong, Matthew J.; Sanders, Paul G.; Shingledecker, John; White, C.L.

doi:10.1007/s11661-015-2898-0

Cited by 21 publications

(8 citation statements)

References 14 publications

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“…Nickel-based alloys represent a particularly important class of superalloys for high temperature applications [1]. The most remarkable ones are the γ/γ' single crystals which offer very high levels of high temperature mechanical properties [2][3][4] and oxidation resistance [5][6][7][8]. Essentially devoted to constitute elongated pieces, these singlecrystal alloys are unfortunately not suitable to the compact geometries of many complex-shaped components for which other elaboration/shaping techniques must be preferred (conventional foundry, powder metallurgy…).…”

Section: Introductionmentioning

confidence: 99%

Influence of Titanium on the High Temperature Oxidation and Chromia Volatilization of Ternary Ni–Cr–C Alloys

2016

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Two ternary alloys, Ni-25Cr-0.25C and Ni-25Cr-0.50C (wt.%) and three versions containing also titanium (1 and 2 wt.%) were cast and submitted to oxidation in dry synthetic air at 1200°C to observe the effects of titanium on the behaviors of the nickel-based alloys belonging to this category. The mass gains are wholly parabolic in all cases and the values of the parabolic and chromia-volatilization constants are typical of a chromia-forming behavior. The mass gains of the Ti-containing alloys are faster than for the Ni-Cr-C alloys, and these kinetic differences are consistent with the differences in chromia thickness and in Cr-impoverishment of the subsurface. In addition the presence of Ti led to the development of thin a TiO 2 outer scale isolating chromia from hot air, but without benefit for the protection of Cr 2 O 3 against volatilization. The obtained results also suggest that Ti may perturb the Cr diffusion in volume but also delay the oxide spallation during cooling.

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Section: Introductionmentioning

confidence: 99%

Influence of Titanium on the High Temperature Oxidation and Chromia Volatilization of Ternary Ni–Cr–C Alloys

2016

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“…At longer exposures at this temperature, γ′-Ni 3 Ti transforms into a coarse, plate-deposited η-Ni 3 Ti phase, which crystallizes in a hexagonal, close-packed lattice (HCP Ni 3 Ti). Several works deal with the transformation of the γ′-Ni 3 Ti phase to η-phase [ 3 , 4 , 5 ]. The η phase occurs in Ni, Ni–Fe, and Co alloys, where the ratio of Ti:Al alloying elements is >1, most often about 3:1.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, the DO 24 η-phase was considered to replace the γ′-phase as a reinforcing phase at higher temperatures. The η phase is most often excreted at grain boundaries, either in the form of blocks or needles at aging temperatures in the range of 600–850 °C or with a Widmanstätten morphology at aging temperatures above 850 °C [ 5 ]. Some studies suggest that the η-phase may also arise as a consequence of the degradation of primary MC carbides, as their degradation releases Ti [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Some studies suggest that the η-phase may also arise as a consequence of the degradation of primary MC carbides, as their degradation releases Ti [ 6 , 7 ]. Further studies have described that the η-phase can also occur at the expense of the γ′-phase because the η-phase is more stable at higher temperatures compared to the γ′-phase [ 5 , 8 ]. Ou et al [ 9 ] pointed out that at higher aging temperatures (750–800 °C) and longer times, new volumes of needle η-phase are formed, nucleating preferentially at grain boundaries and around MC carbides, subsequently growing into the grain.…”

Section: Introductionmentioning

confidence: 99%

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The Hardness Evolution of Cast and the High-Cycle Fatigue Life Change of Wrought Ni-Base Superalloys after Additional Heat Treatment

et al. 2021

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Concerning the use of modern technologies and manufacturing systems in the production of high-stress components from Ni-base superalloys and the optimization of the production process, knowledge of the microstructure–mechanical properties relationship is very important. The microstructure of Ni-base superalloys is very closely related to the chemical composition. With the high number of alloying elements, various phases are presented in the structure of Ni-base superalloys, which have a predominantly positive effect on the mechanical properties, but also phases that reduce, in particular, the heat resistance of these materials. The aim of the presented paper is the quantification of structural parameters of two types of cast alloys, ZhS6K and IN738, where the effect of dwell at 10 and 15 h at 800 °C on the change in morphology and volume fraction of the γ′-phase precipitate was studied. The detected changes were verified by the Vickers hardness test. The IN718 superalloy was chosen as a representative of the wrought superalloy. This alloy was also annealed for 72 h at a temperature of 800 °C, and the quantification of structural parameters was performed by EDS mapping and TEM analysis. Another partial goal was to assess the effect of changes in the volume fraction of the γ′-phase and δ-phase on the change in the high-cycle fatigue life of superalloy IN 718. This superalloy was tested by dynamic cyclic loading with cycle asymmetry parameter R = −1 at an ambient temperature of 22 ± 5 °C and at a temperature of 700 ± 5 °C and with cycle asymmetry parameter R < 1 (three-point bending load) after annealing at 700 °C/72 h. The results of the quantitative analyses and fatigue tests will be further used in optimizing the design of Ni-base superalloy components by modern technologies such as additive technologies for the production of turbine blades and implemented within the philosophy of Industry 4.0.

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“…a L1 2 -ordered ′ -precipitate phase and a ductile -matrix phase. The ′ precipitates, dispersed in the -matrix, play a significant role in increasing the strength and enhancing the fatigue and creep behaviour of the alloys at elevated temperature [1][2][3]. In order to achieve further improved mechanical properties, new development of nickel-based superalloys is normally pursued by increasing the ′ volume fraction.…”

Section: Introductionmentioning

confidence: 99%

3D DDD modelling of dislocation–precipitate interaction in a nickel-based single crystal superalloy under cyclic deformation

Lin

Huang

Zhao

et al. 2018

Philosophical Magazine

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Design of an Eta-Phase Precipitation-Hardenable Nickel-Based Alloy with the Potential for Improved Creep Strength Above 1023 K (750 °C)

Cited by 21 publications

References 14 publications

Influence of Titanium on the High Temperature Oxidation and Chromia Volatilization of Ternary Ni–Cr–C Alloys

Influence of Titanium on the High Temperature Oxidation and Chromia Volatilization of Ternary Ni–Cr–C Alloys

The Hardness Evolution of Cast and the High-Cycle Fatigue Life Change of Wrought Ni-Base Superalloys after Additional Heat Treatment

3D DDD modelling of dislocation–precipitate interaction in a nickel-based single crystal superalloy under cyclic deformation

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