US20110142714A1 - Ni-BASED SINGLE CRYSTAL SUPERALLOY AND COMPONENT OBTAINED FROM THE SAME - Google Patents

Ni-BASED SINGLE CRYSTAL SUPERALLOY AND COMPONENT OBTAINED FROM THE SAME Download PDF

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US20110142714A1
US20110142714A1 US13/000,815 US200913000815A US2011142714A1 US 20110142714 A1 US20110142714 A1 US 20110142714A1 US 200913000815 A US200913000815 A US 200913000815A US 2011142714 A1 US2011142714 A1 US 2011142714A1
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mass
single crystal
alloy
based single
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Hiroshi Harada
Yutaka Koizumi
Toshiharu Kobayashi
Tadaharu Yokokawa
Masao Sakamoto
Kyoko Kawagishi
Tomonori Kitashima
An-chou Yeh
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National Institute for Materials Science
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National Institute for Materials Science
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%

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  • the present invention relates to an Ni-based single crystal superalloy comprising Al, Ta, W, Re, Cr and Ru, which is a novel Ni-based single crystal superalloy excellent in high-temperature creep property and also in environmental property such as high-temperature corrosion resistance.
  • Typical compositions of Ni-based single crystal superalloys developed as materials for high-temperature blades and vanes such as aeroengines, gas turbines and others are, for example, those shown in Table 1.
  • Ni-based single crystal superalloys are obtained through solution treatment followed by aging treatment.
  • the alloy is a so-called precipitation-hardened alloy, and has a morphology where a precipitation phase, ⁇ ′-phase is precipitated in the matrix phase, ⁇ -phase.
  • CMSX-2 (by Canon Muskegon, see Patent Reference 1) is a first-generation alloy
  • CMSX-4 (by Canon Muskegon, see Patent Reference 2) is a second-generation alloy
  • Rene'N6 by General Electric, see Patent Reference 3
  • CMSX-10K by Canon Muskegon, see Patent Reference 4
  • 3B and MX-4 are fourth-generation alloys.
  • first-generation alloy CMSX-2 and second-generation alloy CMSX-4 are, though comparable thereto in point of creep strength at low temperatures, inferior to the third-generation alloys in point of creep strength at high temperatures, since a large quantity of eutectic ⁇ ′-phase remains therein even after high-temperature solution treatment.
  • the above-mentioned third-generation Rene'N6 and CMSX-10K are alloys that are intended to have more increased creep strength at high temperatures than the second-generation alloys.
  • the compositional ratio of Re 5% by mass or more
  • the excessive Re may compound with the other elements to form a so-called TCP phase (topologically close packed phase) through precipitation at high temperatures, therefore bringing about a problem in that the amount of the TCP phase increases in long-term use at high temperatures and the creep strength of the alloy is thereby lowered.
  • the alloy is exposed to oxygen-containing, high-temperature combustion gas for a long period of time, and therefore, along with the above-mentioned strength improvement at high temperatures, the oxidation resistance and the corrosion resistance at high temperatures are also important performance factors of the Ni-based single crystal superalloy that should not be overlooked.
  • None of the above-mentioned patent references have Examples relating to concrete oxidation resistance; but some of them have a qualitative description indicating the effectiveness of Cr, Hf, Ta and the like for oxidation resistance.
  • Ru that shows a remarkable effect for strength improvement at high temperatures is, on the other hand, said to lower the oxidation resistance and the corrosion resistance at high temperature (Patent Reference 8).
  • FIG. 1 the data of the creep rupture lifetime at 1100° C. and 137 MP and the oxidation resistance at 1100° C. of typical various existing alloys are plotted. Rene'N5 and CMSX-4 shows considerably excellent oxidation resistance; however, these existing alloys could have improved oxidation resistance owing to the high Cr content therein, but their creep life at high temperatures is insufficient.
  • the MX-4 alloy is known as a fourth-generation alloy having considerably excellent high-temperature heat resistance, but its oxidation resistance at high temperatures is poor.
  • an object of the present invention is to provide a high-performance Ni-based single crystal superalloy well balanced in two features of high-temperature strength and oxidation resistance at high temperatures in practical use. Another object of the invention is to provide an Ni-based single crystal superalloy still having sufficient characteristics even in “heat treatment window” that should not be overlooked in practical use.
  • the invention employs the following constitution.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to 2.0% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 5.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 5.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 4.1% by mass to 8.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0.1% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 5.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 4.1% by mass to 8.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0.1% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 5.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.1% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 4.1% by mass to 8.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • Ni-based single crystal superalloy enables, in principle, suppression of TCP phase precipitation in use at high temperatures that causes strength reduction, by addition of Ru thereto; and by defining the compositional ratio of the other constitutive elements to fall within the optimum range as in the above to thereby control the lattice constant of the matrix phase ( ⁇ -phase) and the lattice constant of the precipitation phase ( ⁇ ′-phase) to the optimum value, an alloy excellent in high-temperature strength can be provided.
  • the present invention is directed to optimization of the composition for improving the above-mentioned high-temperature strength and to improvement of the oxidation resistance of the substrate itself of the Ni-based single crystal superalloy, and the inventors have found the practicable Ni-based single crystal superalloy well balanced in both the strength and the oxidation resistance at high temperatures by further optimizing the compositional ratio of Ru and other alloying elements.
  • the creep rupture lifetime of the alloy at 1,100° C. and 137 MPa is about 1,925 hours; and in a high-temperature oxidation acceleration test by a cycle at 1,100° C. for 1.0 hour, the alloy undergoes little mass change up to 600 cycles.
  • Ni-based single crystal superalloy system may further contain, as ratio by mass, from 0% by mass to 2.0% by mass of Ti.
  • Ni-based single crystal superalloy system may contain at least one of B, C, Si, Y, La, Ce, V and Zr.
  • the individual ingredients are preferably, as ratio by mass, at most 0.05% by mass of B, at most 0.15% by mass of C, at most 0.1% by mass of Si, at most 0.1% by mass of Y, at most 0.1% by mass of La, at most 0.1% by mass of Ce, at most 1% by mass of V and at most 0.1% by mass of Zr.
  • Ni-based single crystal superalloy of the invention is the above-mentioned Ni-based single crystal superalloy wherein a1 representing the lattice constant of the matrix phase and a2 representing the lattice constant of the precipitation phase satisfy 0.990a1 ⁇ a2 ⁇ a1.
  • the Ni-based single crystal superalloy of the invention is an alloy containing Al, Ta, W, Re, Cr and Ru as the main additives and containing Mo, Hf and Co as regulative additive elements.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to 2.0% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 5.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 5.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 4.1% by mass to 8.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0.1% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 5.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.12% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 4.1% by mass to 8.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the Ni-based single crystal superalloy of the invention is characterized in that the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0.1% by mass to less than 1.1% by mass of Mo, from 3.0% by mass to less than 5.0% by mass of W, from 5.0% by mass to 8.0% by mass of Re, from 0% by mass to less than 0.1% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 4.1% by mass to 8.0% by mass of Ru, with the balance of Ni and inevitable impurities.
  • the above-mentioned alloys all have an austenite phase, ⁇ -phase (matrix phase), and an intermediate order phase, ⁇ ′-phase (precipitation phase) dispersed and precipitated in the matrix phase.
  • the ⁇ ′-phase mainly comprises an intermetallic compound represented by Ni 3 Al, and the ⁇ ′-phase improves the high-temperature strength of the Ni-based single crystal superalloy.
  • Cr is an element excellent in oxidation resistance, and improves the high-temperature corrosion resistance of the Ni-based single crystal superalloy.
  • compositional ratio of Cr is preferably within a range of from 3.0% by mass to 7.0% by mass, more preferably within a range of from 3.5% by mass to 6.5% by mass, most preferably within a range of from 4.0% by mass to 6.0% by mass.
  • compositional ratio of Cr When the compositional ratio of Cr is less than 3.0% by mass, then it is unfavorable since the desired high-temperature corrosion resistance could not be secured; but when the compositional ratio of Cr is more than 7.0% by mass, it is unfavorable since the ⁇ ′-phase precipitation is suppressed and harmful phases such as ⁇ -phase, ⁇ -phase and the like would be formed to lower the high-temperature strength.
  • Mo dissolves in the matrix phase, ⁇ -phase in the co-presence of W and Ta, thereby increasing the high-temperature strength of the alloy, and contributes toward the high-temperature strength through precipitation hardening.
  • Mo greatly contributes toward the lattice misfit and the dislocation network distance (to be mentioned below) that are the characteristics of the present alloy.
  • compositional ratio of Mo is preferably within a range of from 0.0% by mass to 2.0% by mass, more preferably within a range of from 0.0% by mass to less than 1.1% by mass, most preferably within a range of from 0.1% by mass to less than 1.1% by mass.
  • W increases the high-temperature strength of the alloy owing to the effect of solid solution strengthening and precipitation hardening in the co-presence of Ta and Mo as so mentioned in the above.
  • the compositional ratio of W is preferably within a range of from 3.0% by mass to 8.0% by mass, more preferably within a range of from 3.0% by mass to 6.0% by mass, most preferably within a range of from 3.0% by mass to 5.0% by mass.
  • Ta increases the high-temperature strength of the alloy owing to the effect of solid solution strengthening and precipitation hardening in the co-presence of W and Mo as so mentioned in the above, and it partly acts on the ⁇ ′-phase for precipitation hardening to thereby increase the high-temperature strength.
  • compositional ratio of Ta is preferably within a range of from 4.0% by mass to 8.0% by mass.
  • compositional ratio of Ta When the compositional ratio of Ta is less than 4.0% by mass, then it is unfavorable since the desired high-temperature strength could not be secured; but when the compositional ratio of Ta is more than 10.0% by mass, it is also unfavorable since ⁇ -phase and ⁇ -phase would be formed to lower the high-temperature strength. In addition, in practical use, when the compositional ratio of Ta is 8.0% by mass or more, then it is unfavorable since the density of the Ni-based single crystal superalloy would increase. The most preferred compositional ratio of Ta is within a range of from 6.0% by mass to 8.0% by mass.
  • Al compounds with Ni and forms an intermetallic compound represented by (Ni 3 Al) to form the ⁇ ′-phase that is finely and uniformly dispersed and precipitated in the matrix phase in a fraction ratio by volume of from 60 to 70%, thereby increasing the high-temperature strength of the alloy.
  • compositional ratio of Al is preferably within a range of from 5.0% by mass to 7.0% by mass.
  • compositional ratio of Al When the compositional ratio of Al is less than 5.0% by mass, then it is unfavorable since the precipitation amount of the ⁇ ′-phase would be low and the desired high-temperature strength of the alloy could not be secured; but when the compositional ratio of Al is more than 7.0% by mass, then it is also unfavorable since a large quantity of coarse ⁇ ′-phase called eutectic ⁇ ′-phase would be formed to disable the solution treatment and the alloy could not secure sufficient high-temperature strength.
  • Hf is an antioxidation-enhancing element.
  • the compositional ratio of Hf is preferably within a range of from 0.00% by mass to 0.50% by mass, most preferably within a range of from 0.01% by mass to less than 0.12% by mass.
  • the compositional ratio of Hf When the compositional ratio of Hf is less than 0.01% by mass, then it is unfavorable since the antioxidation-enhancing effect could not be secured. However, depending on the content of Al and/or Cr, the compositional ratio of Hf may be from 0% by mass to less than 0.01% by mass, as the case may be. When the compositional ratio of Hf is too large, it is unfavorable as often causing local melting to lower the high-temperature strength of the alloy.
  • Co expands the solid solution limit of Al, Ta and others in the mother phase at high temperatures thereby to disperse and precipitate fine ⁇ ′-phase through heat treatment to increase the high-temperature strength of the alloy.
  • the compositional ratio of Co is preferably within a range of from 0.0% by mass to 9.9% by mass, more preferably within a range of from 0.1% by mass to 9.9% by mass.
  • the compositional ratio of Co may be 0% by mass or less than 0.1% by mass, as the case may be.
  • compositional ratio of Co is more than 9.9% by mass, then it is unfavorable since the balance with the other elements such as AI, Ta, Mo, W, Hf, Cr and others may be lost and some harmful phases may precipitate to lower the high-temperature strength of the alloy.
  • Re dissolves in the matrix phase, ⁇ -phase to improve the high-temperature strength of the alloy through solid solution strengthening. In addition, it has another effect of enhancing the corrosion resistance. On the other hand, addition of too much Re would lower the high-temperature strength as causing precipitation of the harmful phase, TCP phase at high temperatures.
  • the compositional ratio of Re is preferably within a range of from 3.0% by mass to 8.0% by mass, more preferably from 5.8% by mass to 8.0% by mass.
  • the compositional ratio of Re is less than 3.0% by mass, then it is unfavorable since the solid solution strengthening for the ⁇ -phase would be insufficient and the desired high-temperature strength could not be secured.
  • the compositional ratio of Re is more than 8.0% by mass, then it is also unfavorable since the TCP phase would precipitate at high temperatures to lower the high-temperature strength and since the increase in the amount of expensive Re would cause the increase in the alloy material cost.
  • Ru prevents the precipitation of the TCP phase, thereby improving the high-temperature strength of the alloy.
  • compositional ratio of Ru is preferably within a range of from 1.0% by mass to 14.0% by mass, more preferably within a range of from 1.0% by mass to 8.0% by mass. Even more preferably, the compositional ratio of Ru is within a range of from 4.1% by mass to 8.0% by mass.
  • compositional ratio of Ru When the compositional ratio of Ru is less than 1.0% by mass, then the TCP phase would precipitate at high temperatures and sufficient high-temperature strength could not be secured. Further, when the compositional ratio of Ru is less than 4.1% by mass, then the high-temperature strength of the alloy would be lower than that of the case where the compositional ratio of Ru is not lower than 4.1% by mass. When the compositional ratio of Ru is more than 8.0% by mass, then it is unfavorable since ⁇ -phase would precipitate and the high-temperature strength of the alloy would be thereby lowered. In addition, the increase in the amount of expensive Ru would cause the increase in the alloy material cost, which is unfavorable from the viewpoint of the practical use of the alloy.
  • the compositional ratio of Al, Ta, Mo, W, Hf, Cr. Co, Re, Ru and Ni is controlled to be an optimum one to thereby make the lattice misfit and the dislocation network distance (to be mentioned below) that are computed from the lattice constant of the ⁇ -phase and the lattice constant of the ⁇ ′-phase, fall within an optimum range to increase the high-temperature strength of the alloy, and TCP phase precipitation may be prevented by addition of Ru.
  • defining the compositional ratio of Al, Cr, Ta and Mo to fall within the above-mentioned compositional range makes it possible to lower the alloy production cost.
  • the invention facilitates increase in the specific strength and definition of the lattice misfit and the dislocation network distance to be the optimum value.
  • the percentage of a1 to the difference between the lattice constant a1 of the crystal of the mother phase and the lattice constant a2 of the crystal of the precipitation phase ⁇ (a2 ⁇ a1)/a1 ⁇ 100 (%) ⁇ is referred to as “lattice misfit”.
  • the dislocation network distance could be smaller therefore bringing about the effect of improving the creep strength of the alloy.
  • the lattice misfit is less than 0%, preferably at most ⁇ 0.1%, more preferably at most ⁇ 0.15%.
  • the value is at least ⁇ 1%, more preferably ⁇ 0.8%, even more preferably ⁇ 0.7%.
  • the relation between the lattice constant a2 of the crystal of the precipitation phase and the lattice constant a1 of the crystal of the matrix phase is 0.990a1 ⁇ a2 ⁇ a1, preferably 0.992a1 ⁇ a2 ⁇ 0.999a1, more preferably 0.993a1 ⁇ a2 ⁇ 0.9985a1.
  • the precipitation phase could form and grow in the matrix phase by heat treatment to continuously extend in the perpendicular direction relative to the loading direction thereto, and therefore, the dislocation defects migration in the alloy microstructure is suppressed under stress, and the creep strength of the alloy is thereby increased.
  • the composition of the alloying elements of the Ni-based single crystal superalloy must be suitably controlled.
  • the Ni-based single crystal superalloy may further contain Ti.
  • the compositional ratio of Ti is preferably within a range of from 0% by mass to 2.0% by mass. When the compositional ratio of Ti is more than 2.0% by mass, then it is unfavorable since harmful phases would precipitate to lower the high-temperature strength of the alloy.
  • compositional ratio of Ta, Nb and Ti when the total of these (Ta+Nb+Ti) is from 4.0% by mass to 10.0% by mass, then the high-temperature strength of the alloy could be increased.
  • the Ni-based single crystal superalloy may contain, for example, B, C, Si, Y, La, Ce, V, Zr, Nb and the like, in addition to inevitable impurities.
  • the compositional ratio of the individual ingredients is preferably such that B is at most 0.05% by mass, C is at most 0.15% by mass, Si is at most 0.1% by mass, Y is at most 0.1% by mass, La is at most 0.1% by mass, Ce is at most 0.1% by mass, V is at most 1% by mass, Zr is at most 0.1% by mass, Nb is at most 2.0% by mass.
  • the compositional ratio of the individual ingredients is more than the above-mentioned range, then it is unfavorable since harmful phases would precipitate to lower the high-temperature strength of the alloy.
  • Ni-based single crystal superalloys undergo reverse partition, but the Ni-based single crystal alloy of the invention does not undergo reverse partition.
  • the creep rupture lifetime and the oxidation resistance of the Ni-based single-crystal superalloy of the invention described hereinabove are shown in FIG. 1 along with the characteristics of various typical existing alloys therein. It is obvious that, as compared with Rene'N5, CMSX-4 and MX-4 alloys, the Ni-based single crystal superalloy of the invention has extremely excellent characteristics of creep life and oxidation resistance at high temperatures.
  • the degree of oxidation resistance on the vertical axis in FIG. 1 is defined by the following formula.
  • the formula applies to all cases and indicates the oxidation resistance of the alloys.
  • w1 means the mass increase in one cycle (mg/cm 2 )
  • w 50 ⁇ w 1 means the mass change from 1 cycle up to 50 cycles (mg/cm 2 ).
  • compositional ratios of the alloys of the invention (Examples 1 to 3), as well as those of six typical existing heat-resistant alloys (Reference Examples 1 to 6) and four types of fourth-generation and fifth-generation heat-resistant alloys for which the present applicant already filed patent applications (Reference Examples 7 to 11) (Patent References 6 and 7) are shown in Table 2.
  • the alloy ingot was processed for solution treatment and for aging treatment, and the alloy microstructure condition was observed with a scanning electronic microscope (SEM).
  • SEM scanning electronic microscope
  • the solution treatment of the alloys of Examples 1 to 3 and Reference Examples 7 to 11 they were kept at 1573K (1300° C.) for 1 hour, then heated up to 1603K (1330° C.) and kept as such for 5 hours.
  • the aging treatment was continuous treatment of primary aging treatment at 1273K to 1423K (1000° C. to 1150° C.) for 4 hours followed by secondary aging treatment at 1143K (870° C.) for 20 hours.
  • the existing alloys of Reference Examples 1 to 6 were processed for solution treatment and aging treatment under known conditions for each alloy. As a result, no TCP phase was confirmed in the texture of every sample.
  • FIG. 2 is the transmission electromicroscopic picture of the Ni-based single crystal alloy of Example 1 that was processed for solution treatment at 1345° C. for 18 hours followed by aging treatment at 1150° C. Network dislocations are observed and the network distance is about 0.32 ⁇ m, which indicates favorable Ni-based single crystal alloys.
  • the solution-treated and aging-treated samples were tested in an oxidation resistance test.
  • the oxidation resistance test condition the alloy of Example 1 was exposed to air at a high temperature of 1150° C. for 1 hour as one cycle, and the mass change after 50 cycles was measured. The degree of oxidation was 18.8, and the alloy was extremely excellent in both heat resistance and oxidation resistance.
  • the heat-resistant alloys of the invention (Examples 1 to 3), various typical existing practical alloys (Reference Examples 1 to 6) and heat-resistant alloys already proposed by the present inventors (Reference Examples 7 to 11) (Patent References 6 and 7) were compared with each other in point of their properties, creep rupture lifetime at 1100° C. and under 137 MP and oxidation resistance at 1150° C.
  • Typical existing practical alloys are poor in high temperature mechanical strength; and the alloys already proposed by the inventors are obviously more excellent than the practical alloys in point of the mechanical strength, but some of them are not always sufficient in point of the oxidation resistance.
  • FIG. 3 comparatively shows the mass change of the alloy of Example 1 and the alloy of Reference Example 4 in a cyclic oxidation test where the alloys were exposed to air at a high temperature of 1100° C. for 1 hour as one cycle, and repeatedly for a total of about 600 cycles.
  • the results indicate that the alloy of the invention has much more excellent oxidation resistance than the existing alloy CMSX-4 that is generally known to have excellent oxidation resistance.
  • FIG. 4 shows the observation of the surface of the alloy of Example 1 exposed to air at 1150° C. for 10 hours.
  • the alloy surface has a multilayer structure of plural dense and thin layers including an oxidized alumina layer, which indicates excellent oxidation resistance of the alloy.
  • the lattice misfit value (%) of the alloy of Example 1 and that of the typical existing alloy CMSX-4 (Reference Example 4) were determined through computation, and were ⁇ 0.22 and ⁇ 0.14, respectively.
  • the alloy of Example 1 was better for the smaller dislocation network distance and the consequent improvement of the creep strength of the alloy with maintaining the coherency between the matrix phase, ⁇ -phase and the precipitation phase, ⁇ ′-phase.
  • FIG. 5 shows the data of heat-treatment window of the alloy of Example 1 and the practical alloy of Reference Example 4.
  • the heat-treatment window of the alloy of Example 1 and that of the practical alloy of Reference Example 4 were 47° C. and 28° C., respectively.
  • the alloy of the invention has a broader heat-treatment window than the practical alloy of Reference Example 4 with no problem in the industrial blade casting process of producing it, and is expected to have an extremely high blade yield in the casting process.
  • FIG. 1 is a view of comparing the heat-resistant alloys of the invention (Examples 1 to 3), typical existing practical alloys (Reference Examples 1 to 6) and alloys for which the present inventors already filed patent application (Reference Examples 7 to 11) with each other in point of the creep rupture lifetime at 1100° C. and under 137 MP and the oxidation resistance at 1150° C.
  • FIG. 2 is a transmission electromicroscopic picture of the solution-treated and aging-treated, Ni-based single crystal alloy of Example 1.
  • FIG. 3 is a view showing the mass change of the alloy of Example 1 and the practical alloy of Reference Example 4 exposed to air at a high temperature of 1100° C. for 1 hour as one cycle and repeatedly for a total of about 600 cycles.
  • FIG. 4 is a photographic picture to observe the surface of the alloy of Example 1 exposed to air at 1150° C. for 10 hours.
  • FIG. 5 shows thermal analysis results for heat-treatment window of the alloy of Example 1 and the practical alloy of Reference Example 4.

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US9169540B2 (en) 2010-09-24 2015-10-27 Osaka Prefecture University Public Corporation Re-added Ni-based dual multi-phase intermetallic compound alloy and method for producing the same
US20160160323A1 (en) * 2013-08-05 2016-06-09 National Institute For Materials Science Oxide particle dispersion-strengthened ni-base superalloy
GB2540964A (en) * 2015-07-31 2017-02-08 Univ Oxford Innovation Ltd A nickel-based alloy
US20170369970A1 (en) * 2016-06-22 2017-12-28 National Tsing Hua University High-entropy superalloy
US11518143B2 (en) 2012-08-20 2022-12-06 Pratt & Whitney Canada Corp. Oxidation-resistant coated superalloy
EP4289613A1 (en) 2022-06-12 2023-12-13 Pratt & Whitney Canada Corp. Oxidation and srz resistant coatings on nickel superalloys

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EP4289613A1 (en) 2022-06-12 2023-12-13 Pratt & Whitney Canada Corp. Oxidation and srz resistant coatings on nickel superalloys

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