Nickel-based superalloy having very high resistance to hot-corrosion for monocrystalline blades of industrial turbines

a technology of industrial turbine blades and superalloy compounds, which is applied in the direction of engines, mechanical equipment, machines/engines, etc., can solve the problems of the most disadvantageous turbine blade types, the inability of monocrystalline turbine blades developed for aeronautical applications to meet the needs of blades for terrestrial or marine applications, and the type of problem posed by the turbine blade. achieve good micro-structural stability

Inactive Publication Date: 2005-09-08
HOWMET CORPORATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0014] Furthermore, this superalloy must demonstrate good micro-structural stability in respect of the precipitation o

Problems solved by technology

The same type of problem has been posed in the past in the case of gas turbines for turbo-jets and turbo-engines for aeronautical applications.
Furthermore, the process of monocrystalline solidification allows the preferred orientation of growth of the monocrystalline component to be selected and, that manner, the orientation which is optimum from the point of view of resistance to creep and thermal fatigue to be chosen, those two types of mechanical stress be

Method used

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  • Nickel-based superalloy having very high resistance to hot-corrosion for monocrystalline blades of industrial turbines
  • Nickel-based superalloy having very high resistance to hot-corrosion for monocrystalline blades of industrial turbines
  • Nickel-based superalloy having very high resistance to hot-corrosion for monocrystalline blades of industrial turbines

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Embodiment Construction

[0028] An alloy according to the invention designated SCA425 has been produced with reference to the nominal composition listed in Table I. In this table, the nominal concentrations of major elements of reference alloys IN939, IN738, IN792 and SC16 are also listed.

TABLE IConcentrations by weight of major elements (%)AlloyNiCoCrMoWAlTiTaNbIN939Base1922.5—21.93.71.41  IN738Base8.5161.72.63.43.41.70.9IN792Base912.41.93.83.14.53.9—SC16Base—163—353.53.5—SCA425Base51614425—

[0029] Chrome has an advantageous and dominant effect on the resistance to hot-corrosion of nickel-based superalloys. Thus, tests have shown that a concentration in the order of 16% by weight was necessary in the alloy of the invention in order to obtain resistance to hot-corrosion that is equivalent to that of reference alloy IN738 under the conditions for hot-corrosion tests described below, which conditions are representative of the environment created by combustion gases of some industrial turbines. Chrome also co...

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Abstract

Nickel-based superalloy, suitable for monocrystalline solidification, having the following composition by weight:
Co:
 4.75 to 5.25%
Cr:
 15.5 to 16.5%
Mo:
 0.8 to 1.2%
W:
 3.75 to 4.25%
Al:
 3.75 to 4.25%
Ti:
 1.75 to 2.25%
Ta:
 4.75 to 5.25%
C:
0.006 to 0.04%
B:
≦0.01%
Zr:
≦0.01%
Hf:
  ≦1%
Nb:
  ≦1%
Ni and any impurities:
complement to 100%.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) [0001] This application is a continuation of U.S. application Ser. No. 10 / 460,860, filed Jun. 12, 2003, which is a continuation of U.S. application Ser. No. 09 / 999,167, filed Nov. 29, 2001, which claims priority of European Patent Application Number EP00403361, filed Nov. 30, 2000.TECHNICAL FIELD [0002] The invention relates to a nickel-based superalloy which is adapted to the manufacture of fixed and movable monocrystalline blades of industrial gas turbines by directional solidification. BACKGROUND OF THE INVENTION [0003] Nickel-based superalloys are the most high-performance materials used today in the manufacture of movable and fixed blades of industrial gas turbines. The two principal features required until now of these alloys for those specific applications have been good resistance to creep at temperatures of up to 850° C. and very good resistance to hot-corrosion. Some reference alloys currently used in this field are designated IN73...

Claims

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Application Information

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IPC IPC(8): F01D5/28C22C19/05
CPCC22C19/056
Inventor CARON, PIERREBLACKLER, MICHAELMCCOLVIN, GORDON MALCOLMWAHI, RAJESHWAR PRASADESCALE, ANDRE MARCELLELAIT, LAURENT
Owner HOWMET CORPORATION
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