Novel Co-Ti-V-base superalloys reinforced by L12-ordered γ′ phase

Ruan, Jun; Liu, X.J.; Yang, Shuiyuan; Xu, Weiwei; Omori, Toshihiro; Yang, Tao; Deng, Bin; Jiang, Hengxing; Wang, C.P.; Kainuma, Ryosuke; Ishida, K.

doi:10.1016/j.intermet.2017.09.015

Cited by 66 publications

(12 citation statements)

References 39 publications

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“…pct W approximately lowers the alloy density by around 0.11 g/cm 3 , slightly less than Nb by about 0.15 g/cm 3 . The density of 1W4Mo and 1W4Nb are close to the recent reported low-density Co-based alloys Co-Al-Mo, Co-Ti-Cr, Co-Ti-V, C-Nb-V, [25][26][27][28][29] etc. and commercial Co-and Ni-based alloys IN718, U720Li, etc.…”

Section: A Predicted Thermodynamic Propertiessupporting

confidence: 86%

“…[5,[14][15][16][17][18][19][20] Neumeier et al [21] and Knop et al [22] reported Co-based superalloys with better high-temperature strength than most of polycrystalline Ni-based superalloys, but the density is as high as 8.8 and 8.52 g/cm 3 . As a result, variant alloy systems with low or zero W content have been investigated, developing alloys based on Co-Al-Mo, [23,24] Co-Ge-W, [25,26] Co-Ti-Cr, [27] Co-Ti-V, [28] Co-Nb-V, [29] and so on. Accordingly, the density has been decreased from 9.5 to 8.5 g/cm 3 , close to those of most commercial Ni-based and Co-based polycrystalline alloys.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Properties Evolution of Co-Al-W-Ni-Cr Superalloys by Molybdenum and Niobium Substitutions for Tungsten

Zhang

Xue

et al. 2019

Metall Mater Trans A

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The microstructure and mechanical properties of Co-Al-W to Co-Al-Mo/Nb alloy systems have been investigated in an attempt to identify the influence of replacement for W in multicomponent Co-based alloys with 30 at. pct Ni and 12 at. pct Cr. Either Mo or Nb additions at the expense of W reduce alloy density to a similar extent. Increasing Mo substitution significantly decreases the c¢ volume fraction and results in spherical c¢ morphology at 750°C, whereas Nb substitution shows opposite effects on the c¢ volume fraction and morphology. Accordingly, the Mo and Nb additions raise and decrease the microhardness and high-temperature compression strength, respectively. The results can provide reference for the development of Co-based superalloys with low density and high strength.

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Section: A Predicted Thermodynamic Propertiessupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties Evolution of Co-Al-W-Ni-Cr Superalloys by Molybdenum and Niobium Substitutions for Tungsten

Zhang

Xue

et al. 2019

Metall Mater Trans A

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“…More importantly, γ/γ' two-phase Co-V-Ti-Al and Co-V-Ti-Ni alloys have been reported. Co-V-Ti-Al alloy shows a maximum flow stress of about 355 MPa at 700 • C and Co-V-Ti-Ni alloy shows a maximum flow stress of about 544 MPa at 750 • C [45]. Although Co-V-Ti-based superalloys have such great mechanical properties, their strengths are still much lower than the Nickel-based superalloys.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nb and W Additions on the Microstructures and Mechanical Properties of Novel γ/γ’ Co-V-Ti-Based Superalloys

Liu

Pan

Chen

et al. 2018

Metals

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Microstructures, elemental partition behavior, phase stabilities and mechanical properties of Nb- and W-containing Co-V-Ti-based superalloys were investigated. Elemental partition coefficients (KX = Cγ’/Cγ) of Nb and W in Co-V-Ti-based superalloys are 2.07 and 1.10, respectively. The γ’ solvus temperatures are determined as 1023 °C, 1055 °C and 1035 °C in Co-12V-4Ti, Co-10V-4Ti-2Nb and Co-10V-4Ti-2W alloys, which are higher than those of Co-9Al-9W alloy (1000 °C). The mass densities of quaternary Co-10V-4Ti-2Nb and Co-10V-4Ti-2W alloys are about 8.31 and 8.50 g·cm−3, respectively, which are 15% lower than Co-Al-W-based superalloys (9.8 g·cm−3). All examined alloys exhibit an anomalous positive dependence on temperature rising from 600 to 750 °C. Strengths of all examined alloys are higher than those of MarM509 (traditional Cobalt-based superalloy) and Co-9Al-9W at all temperatures that we investigated. The maximum flow stress of Co-V-Ti-Nb alloy is about 638 MPa at 750 °C while that of Co-V-Ti-W alloy is about 588 MPa at 700 °C.

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“…The mass density of Co-Ti-Cr alloys hardened by the γ′ phase is about 14% lower than that of a typical Co-Al-W alloy and has a small lattice misfit between γ and γ ′ and a higher γ ′ phase volume fraction [34]. Recently, Ruan et al reported the effects of Al and Ni on the microstructure, phase stability, and hightemperature mechanical properties of Co-Ti-V alloys [36].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni on Microstructure and Mechanical Property of a Co-Ti-V-Based Superalloy

et al. 2021

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The effect of Ni on microstructure, elemental partition behavior, γ ′ phase solvus temperature, lattice misfit between γ and γ ′ phases, and mechanical properties of the Co-8Ti-11V-xNi alloys was investigated. The result shows that the lattice misfit in the alloys decreases from 0.74% to 0.61% as the Ni content increases from 0 to 10%, and the average sizes of the cuboidal γ ′ phase were measured to be 312.10 nm, 112.86 nm, and 141.84 nm for the Co-8Ti-11V, Co-8Ti-11V-5Ni, and Co-8Ti-11V-10Ni, respectively. Ti, V, and Ni exhibit a slight tendency to partition into the γ ′ phase, while Co shows a slight tendency to partition into the γ phase. The solvus temperatures of the γ ′ phase were measured to be 1167°C, 1114°C, and 1108°C for the Co-8Ti-11V, Co-8Ti-11V-5Ni, and Co-8Ti-11V-10Ni alloys, respectively, by using differential scanning calorimetry (DSC). Moreover, the yield strength and ultimate strength of the Co-8Ti-11V, Co-8Ti-11V-5Ni, and Co-8Ti-11V-10Ni alloys were investigated, and the yield strength and ultimate strength of the 10Ni alloy were highest, at 219 MPa and 240 MPa. After compression at 1000°C, the dislocations cannot effectively shear the γ ′ phase in the 0Ni and 10Ni alloys, resulting in a relatively high compressive strength of the 0Ni and 10Ni alloys. However, the γ ′ phase of the 5Ni alloy is no longer visible, and its strength is the lowest.

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Novel Co-Ti-V-base superalloys reinforced by L12-ordered γ′ phase

Cited by 66 publications

References 39 publications

Microstructure and Properties Evolution of Co-Al-W-Ni-Cr Superalloys by Molybdenum and Niobium Substitutions for Tungsten

Microstructure and Properties Evolution of Co-Al-W-Ni-Cr Superalloys by Molybdenum and Niobium Substitutions for Tungsten

Effects of Nb and W Additions on the Microstructures and Mechanical Properties of Novel γ/γ’ Co-V-Ti-Based Superalloys

Effect of Ni on Microstructure and Mechanical Property of a Co-Ti-V-Based Superalloy

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