NICKEL-BASED SUPERALLOY WHICH IS EVEN SUITABLE FOR ADDITIVE MANUFACTURE, METHOD, AND PRODUCT

Abstract

Nickel-based superalloy suitable for additive manufacture, a method, and a product includes a special selection of the elements silicon, boron, zirconium, and hafnium. The nickel-based superalloy includes at least the following (in wt.%): carbon (C) 0.04%-0.08% chromium (Cr) 9.8%-10.2% cobalt (Co) 10.3%-10.7% molybdenum (Mo) 0.4%-0.6% tungsten (W) 9.3%-9.7% aluminum (Al) 5.2%-5.7% tantalum (Ta) 1.9%-2.1% boron (B) 0.0025%-0.01% zirconium (Zr) 0.0025%-0.01% hafnium (Hf) 0.1%-0.3%, and optionally yttrium (Y) and residual nickel (Ni).

Claims

1. A nickel-based superalloy at least comprising, (in percent by weight) elements: TABLE-US-00003 Carbon (C) 0.04%-0.08% Chromium (Cr)  9.8%-10.2% Cobalt (Co) 10.3%-10.7% Molybdenum (Mo) 0.4%-0.6% Tungsten (W) 9.3%-9.7% Aluminum (Al) 5.2%-5.7% Tantalum (Ta) 1.9%-2.1% Boron (B) 0.0025%-0.01%  Zirconium (Zr) 0.0025%-0.01%  Hafnium (Hf) 0.1%-0.3% Nickel (Ni) optionally Yttrium (Y) 0.005%-0.015% also optionally, in each case not more than: TABLE-US-00004 Silicon (Si)  0.02% Manganese (Mn)  0.05% Phosphorus (P)  0.005% Sulfur (S)  0.001% Titanium (Ti)  0.01% Iron (Fe)  0.05% Copper (Cu)  0.01% Vanadium (V)   0.1% Silver (Ag) 0.0005% Lead (Pb) 0.0002% Selenium (Se) 0.0010% Oxygen (O) 0.0200% Gallium (Ga) 0.0030% Bismuth (Bi) 0.0010% Nitrogen (N) 0.0050% Magnesium (Mg)  0.0070%.

2. The alloy as claimed in claim 1, comprising: yttrium (Y).

3. A process for producing a component, comprising: using an alloy as claimed in claim 1 to produce the component.

4. The process as claimed in claim 3, wherein a powder bed process or a buildup welding process is used.

5. The process as claimed in claim 3, wherein a selective sintering process (SLS) or a selective melting process (SLM) is used.

6. The process as claimed in claim 3, wherein a powder buildup welding process is used.

7. A product comprising: an alloy as claimed in claim 1.

8. A nickel-based superalloy, wherein the nickel-based superalloy consists of the elements of claim 1.

9. The process as claimed in claim 5, wherein laser or electron radiation is used.

10. The process as claimed in claim 6, wherein laser powder buildup welding process is used.

11. A product, produced by the process of claim 3.

Description

DETAILED DESCRIPTION OF INVENTION

[0014] The alloying elements have been matched in a targeted manner in order to be able to manufacture crack-free specimens.

[0015] Here, the elements silicon (Si), boron (B), zirconium (Zr) and hafnium (Hf) are of particular importance and carbon (C) likewise has to be taken into account, but modifications by hafnium (Hf) were most relevant.

[0016] The tendency to form solidification cracks in the production of a product composed of or comprising the alloy described can advantageously be decreased or entirely avoided by the present invention. This is based on a reduction in the proportion of liquid phase/eutectic in the temperature range from 1273K to the solidus temperature with simultaneous setting of a relatively small solidification interval.

[0017] The processability can also be improved, or the tendency to form cracks can be advantageously reduced, by the reduction in the γ′-solvus temperature via the present adaptation or selection of the Hf content.

[0018] Manufacture is advantageously carried out by means of LB-PB F.

[0019] The alloy advantageously has the following composition (in percent by weight):

TABLE-US-00001 Carbon (C) 0.04%-0.08% Chromium (Cr)  9.8%-10.2% Cobalt (Co) 10.3%-10.7% Molybdenum (Mo) 0.4%-0.6% Tungsten (W) 9.3%-9.7% Aluminum (Al) 5.2%-5.7% Tantalum (Ta) 1.9%-2.1% Boron (B) 0.0025%-0.01%  Zirconium (Zr) 0.0025%-0.01%  Hafnium (Hf) 0.1%-0.3% Nickel (Ni) optionally Yttrium (Y) 0.005%-0.015% [0020] also optionally, in each case not more than:

TABLE-US-00002 Silicon (Si)  0.02% Manganese (Mn)  0.05% Phosphorus (P)  0.005% Sulfur (S)  0.001% Titanium (Ti)  0.01% Iron (Fe)  0.05% Copper (Cu)  0.01% Vanadium (V)   0.1% Silver (Ag) 0.0005% Lead (Pb) 0.0002% Selenium (Se) 0.0010% Oxygen (O) 0.0200% Gallium (Ga) 0.0030% Bismuth (Bi) 0.0010% Nitrogen (N) 0.0050% Magnesium (Mg)  0.0070%.

[0021] The advantages according to the invention can be optimized further by a further suitable selection of process parameters for the additive manufacture, for example the scanning or irradiation rate, the laser power or the track-strip or “hatch” spacing.

[0022] The product comprising the alloy described is advantageously a component which is used in the hot gas path of a turbo machine, for example a gas turbine. In particular, the component can be a rotor blade or guide vane, a segment or ring segment, a burner part or a burner tip, a frame, a shield, a heat shield, a nozzle, seal, a filter, an opening or lance, a resonator, punch or a swirler or be a corresponding transition, insert or a corresponding retrofitted part.