Creep behavior of a novel Co-Al-W-base single crystal alloy containing Ta and Ti at 982<sup>∘</sup>C

Xue, Fei; Zhou, Haijing; Chen, Xuhua; Shi, Qianying; Chang, Hai; Wang, Meiling; Ding, Xianfei; Feng, Qiang

doi:10.1051/matecconf/20141415002

Cited by 20 publications

(6 citation statements)

References 18 publications

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“…In general, both Co-base and Co-Nibase alloys show properties comparable to or better than those of first-generation Ni-base single crystals. The alloys with the lowest creep rates across this temperature range are in general Tiand/or Ta-containing compositions (50,57,58). Co-Ni-base alloys also demonstrate favorable creep properties.…”

Section: Figure 10mentioning

confidence: 90%

“…Creep ductilities are overall somewhat higher in Co-Ni-based alloys, exceeding 25% across a range of compositions (50). Figure 12b compares the creep properties of single crystals of Co-base and Co-Ni-base alloys (50,51,(56)(57)(58) in comparison to Ni-base single crystals of René N4 (52). In general, both Co-base and Co-Nibase alloys show properties comparable to or better than those of first-generation Ni-base single crystals.…”

Section: Figure 10mentioning

confidence: 96%

“…(b) Creep properties of single crystals of Co-base and Co-Ni-base alloys(50,51,(56)(57)(58) in comparison to creep properties of Ni-base single crystals of René N4(52).…”

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confidence: 99%

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L1₂-Strengthened Cobalt-Base Superalloys

Suzuki

Inui

Pollock

2015

Annu. Rev. Mater. Res.

234

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The discovery of the γ -Co 3 (Al,W) phase with an L1 2 structure provided Co-base alloys with a new strengthening mechanism, enabling a new class of high-temperature material: Co-base superalloys. This review discusses the current understanding of the phase stability, deformation, and oxidation behaviors of γ single-phase and γ + γ two-phase alloys in comparison with Ni-base γ -L1 2 phase and γ + γ superalloys. Relatively low stacking fault energies and phase stability of the γ phase compared with those in Nibase alloys are responsible for the unique deformation behaviors observed in Co-base γ and γ + γ alloys. Controlling energies of planar defects, such as stacking faults and antiphase boundaries, by alloying is critical for alloy development. Experimental and density functional theory studies indicate that additions of Ta, Ti, Nb, Hf, and Ni are effective in simultaneously increasing the phase stability and stacking fault energy of γ -Co 3 (Al,W), thus improving the high-temperature strength of Co-base γ phase and γ + γ two-phase superalloys.8.1

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Section: Figure 10mentioning

confidence: 90%

Section: Figure 10mentioning

confidence: 96%

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L1₂-Strengthened Cobalt-Base Superalloys

Suzuki

Inui

Pollock

2015

Annu. Rev. Mater. Res.

234

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“…THE recent report of a c¢-strengthened Co-Al-Wbased alloy opened up a practical possibility for developing new Co-based superalloys, which have become an increasingly active research area over the past decade. [1][2][3][4][5][6][7][8][9][10][11][12][13] After studying their potentials, it was found that the solvus temperature of c¢ precipitates can be increased up to 1200°C with high solidus temperature, [2][3][4][5] mechanical performance [6][7][8] and oxidation properties [9][10][11][12][13] as promising engineering materials candidate for high-temperature applications. However, their high density and limited microstructural stability remain the biggest challenges for their further development.…”

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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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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“…However, there is still no clear conclusion on the mechanism of the influence of Co on the microstructure stability of superalloys. Thirdly, Co improves the creep properties of superalloys by reducing the stacking-fault energy of γ matrix [15][16][17]. The stacking-fault energy significantly influences the creep process due to the climb and cross slip of the dislocations in γ matrix or the introduction of more twin structures in superalloy [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Co on Microstructure and Stress Rupture Properties of K4750 Alloy

Wang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The effects of substituting Co for Fe on the microstructure and stress rupture properties of K4750 alloy were studied. The microstructure of the alloy without Co (K4750 alloy) and the alloy containing Co (K4750-Co alloy) were analyzed. Substitution of Co for Fe inhibited the decomposition of MC carbide and the precipitation of η phase during long-term aging treatment. In K4750-Co alloy, the morphology of MC carbide at the grain boundary (GB) remained dispersed blocky shape and no η phase was observed after aging at 750 °C for 3000 h. However, in K4750 alloy, almost all the MC carbides at GBs broke down into granular M 23 C 6 carbide and needle-like η phase. The addition of cobalt could delay the decomposition of MC carbides, which accordingly restricted the elemental supply for the formation of η phase. The stress rupture tests were conducted on two alloys at 750 °C/430 MPa. When Co is substituted for Fe in K4750 alloy, the stress rupture life increased from 164.10 to 264.67 h after standard heat treatment. This was mainly attributed to increased concentration of Al, Ti and Nb in γ′ phase in K4750-Co alloy, which further enhanced the strengthening effect of γ′ phase. After aging at 750 °C for 3000 h, substitution of Co for Fe can also cause the stress rupture life at 750 °C/430 MPa to increase from 48.72 to 208.18 h. The reason was mainly because MC carbide degradation and η phase precipitation in K4750 alloy, which promoted the initiation and propagation of micro-crack during stress rupture testing.

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Creep behavior of a novel Co-Al-W-base single crystal alloy containing Ta and Ti at 982^∘C

Cited by 20 publications

References 18 publications

L1₂-Strengthened Cobalt-Base Superalloys

L1₂-Strengthened Cobalt-Base Superalloys

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

Effect of Co on Microstructure and Stress Rupture Properties of K4750 Alloy

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Creep behavior of a novel Co-Al-W-base single crystal alloy containing Ta and Ti at 982∘C

Cited by 20 publications

References 18 publications

L12-Strengthened Cobalt-Base Superalloys

L12-Strengthened Cobalt-Base Superalloys

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

Effect of Co on Microstructure and Stress Rupture Properties of K4750 Alloy

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Creep behavior of a novel Co-Al-W-base single crystal alloy containing Ta and Ti at 982^∘C

L1₂-Strengthened Cobalt-Base Superalloys

L1₂-Strengthened Cobalt-Base Superalloys