Superalloy without titanium, powder, method and component

Abstract

A nickel-based superalloy without titanium and a corresponding powder. A process for producing a component, wherein the alloy or the powder is used, in particular for a process for additive manufacture, especially selective laser sintering or selective laser melting. A component having an alloy or produced from the powder or produced by the process.

Claims

1. A nickel-based superalloy, wherein the alloying elements consist of in % by weight: chromium (Cr): 12%-14%, cobalt (Co): 9.5%-11.0%, tungsten (W): 7.5%-9.5%, tantalum (Ta): 1.5%-2.5%, aluminum (Al): 4.5%-5.5%, carbon (C): 0.04%-0.08%, boron (B): 0.007%-0.01%, hafnium (Hf): 0.4%-1.2%, zirconium (Zr): 0.007%-0.01%; and balance nickel (Ni), wherein the nickel-based superalloy comprises no titanium (Ti).

2. The nickel-based superalloy of claim 1, wherein the alloying elements consist of in % by weight: chromium (Cr): 12.5%, cobalt (Co): 10.5%, tungsten (W): 8.5%, tantalum (Ta): 2%, aluminum (Al): 5%, carbon (C): 0.05%, boron (B): 0.009%, hafnium (Hf): 0.5%, zirconium (Zr): 0.009%; and balance nickel (Ni), wherein the nickel-based superalloy comprises no titanium (Ti).

3. A powder comprising: at least the nickel-based superalloy as claimed in claim 1.

4. A powder comprising: the nickel-based superalloy consisting of the alloying elements of claim 1.

5. A process for producing a component, comprising: producing the component with the nickel-based superalloy as claimed in claim 1.

6. The process for producing a component of claim 5, wherein additive manufacture, selective laser sintering, or selective laser melting is used.

7. A process for producing a component, comprising: producing the component with the powder as claimed in claim 3.

8. The process for producing a component of claim 6, wherein additive manufacture, selective laser sintering, or selective laser melting is used.

9. A component comprising: the nickel-based superalloy as claimed in claim 1.

10. A component produced from the powder as claimed in claim 3.

11. A component produced by the process as claimed in claim 5.

Description

DETAILED DESCRIPTION OF INVENTION

(1) It is proposed that a modified composition of the alloy 247 be used. This material advantageously does not contain any titanium (Ti) except for impurities and also has a reduced proportion of tantalum (Ta) (γ′-former).

(2) Furthermore, the proportion of chromium (Cr) has been increased, so that the oxidation and corrosion resistance is improved further.

(3) Up to 0.03% by weight of yttrium (Y) can optionally be alloyed into the material in order to improve the cyclic oxidation resistance.

(4) The following composition range (in % by weight) is advantageous: Ni: balance, Cr: 9-16%, Co: 9-11.5%, W: 6.5-10.5%, Ta: 1-3%, Al: 4-6%, C: 0.03-0.1%, B: 0.005-0.015%, Hf: 0.3-1.5%, Zr: 0.005-0.015%, Y: 0-0.03%.

(5) Advantages are also obtained for the nickel-based superalloy in the case of the following ranges (in % by weight): chromium (Cr): 12%-14%, cobalt (Co): 9.5%-11.0%, tungsten (W): 7.5%-9.5%, tantalum (Ta): 1.5%-2.5%, aluminum (Al): 4.5%-5.5%, carbon (C): 0.04%-0.08%, boron (B): 0.007%-0.01%, hafnium (Hf): 0.4%-1.2%, zirconium (Zr): 0.007%-0.01%, optionally yttrium (Y): 0.01%-0.03%.

(6) Further advantages are obtained for the nickel-based superalloy when using these values (in % by weight): chromium (Cr): 12.5%, cobalt (Co): 10.5%, tungsten (W): 8.5%, tantalum (Ta): 2%, aluminum (Al): 5%, carbon (C): 0.05%, boron (B): 0.009%, hafnium (Hf): 0.5%, zirconium (Zr): 0.009%, optionally yttrium (Y):0%-0.03%.

(7) A definitive alloy listing of Ni, Cr, Co, W, Ta, Al, C, B, Hf, Zr and optionally Y is advantageous.

(8) The material proposed here is entirely novel. It combines the following advantages:—improved weldability and is thus better suited for additive processes and also for deposition welding in the course of repairs,—optimized γ′ structure by widening of the heat treatment window, as a result of which optimized creep resistance (γ/γ′ structure as in the dendritic regions in the cast microstructure should be established after additive buildup and complete heat treatment),—improved economics in additive processes,—economical processability of the alloy 247 by means of additive processes,—improved oxidation resistance.

(9) The powder composed of the alloy can optionally comprise melting point reducers such as gallium (Ga), germanium (Ge), silicon (Si), . . . and/or hard material particles or ceramic particles.