Nickel-based alloy for additive manufacturing and method

Abstract

An alloy is provided by the targeted selection of some elements of silicone, manganese, sulfur, chromium, titanium, aluminum, zirconium, tantalum, iron, copper, niobium, yttrium and yttrium oxide, which can be readily processed and also provides good mechanical characteristic values for the produced component.

Claims

1. A nickel-base superalloy consisting of (in % by weight): carbon (C) 0.13%-0.17% chromium (Cr) 21%-22% cobalt (Co) 18%-20% tungsten (W) 1.8%-2.2% titanium (Ti) 3.0%-3.4% aluminum (Al) 2.1%-3.0% boron (B) 0.008%-0.012% zirconium (Zr) 0.0025%-0.01% tantalum (Ta) 1.6%-2.5% niobium (Nb) 1.2%-1.6% yttrium (Y) 0.0025%-0.0075% optionally: yttrium oxide (Y.sub.2O.sub.3) 0.25%-1.25% optionally and especially not more than: vanadium (V) 0.01% hafnium (Hf) 0.01% silver (Ag) 0.005% lead (Pb) 0.0003% selenium (Se) 0.0003% oxygen (O) 0.005% gallium (Ga) 0.001% bismuth (Bi) 0.0001% nitrogen (N) 0.005% magnesium (Mg) 0.007% tellurium (Te) 0.00005% thallium (Tl) 0.0005% calcium (Ca) 0.0001% potassium (K) 0.0001% silicon (Si) 0.02% manganese (Mn) 0.01% iron (Fe) 0.02% copper (Cu) 0.01% phosphorus (P) 0.005% sulfur (S) 0.001% molybdenum (Mo) 0.1% other impurities 0.1% nickel (Ni) balance.

2. A method of producing a component from an alloy as claimed in claim 1, the method comprising producing the component from the alloy via an additive manufacturing method selected from the group consisting of selective powder melting, selective powder sintering, application welding, and powder application welding.

3. The method as claimed in claim 2, wherein the additive manufacturing method is selected from the group consisting of selective powder melting and selective powder sintering.

4. The alloy as claimed in claim 1, in which the chromium content (Cr) is 21.0% to 21.5%.

5. The alloy as claimed in claim 1, in which the cobalt content (Co) is 19% by weight.

6. The alloy as claimed in claim 1, in which the content of titanium (Ti) is 3.0% by weight to 3.2% by weight.

7. The alloy as claimed in claim 1, in which the content of aluminum (Al) is 2.2% by weight to 2.4% by weight.

8. The alloy as claimed in claim 1, in which the content of tantalum (Ta) is 1.7% by weight to 1.9% by weight.

9. The alloy as claimed in claim 1, in which the content of niobium (Nb) is 1.4% by weight to 1.6% by weight.

10. The alloy as claimed in claim 1, in which the carbon content (C) is 0.15% by weight.

11. The alloy as claimed in claim 1, in which the tungsten content (W) is 2.0% by weight.

12. The alloy as claimed in claim 1, in which the content of aluminum (Al) is 2.4% by weight to 3.0% by weight.

13. The alloy as claimed in claim 1, in which the content of tantalum (Ta) is 1.9% by weight to 2.5% by weight.

Description

DETAILED DESCRIPTION OF INVENTION

(1) The concept is that of a nickel-base superalloy, at least comprising (in % by weight), especially consisting of:

(2) carbon (C) 0.13%-0.17%

(3) chromium (Cr) 21%-22%

(4) cobalt (Co) 18%-20%

(5) tungsten (W) 1.8%-2.2%

(6) titanium (Ti) 3.0%-3.4%

(7) aluminum (Al) 2.1%-3.0%

(8) boron (B) 0.008%-0.012%

(9) zirconium (Zr) 0.0025%-0.01%

(10) tantalum (Ta) 1.6%-2.5%

(11) niobium (Nb) 1.2%-1.6%

(12) optionally:

(13) yttrium (Y) 0.0025%-0.0075%

(14) yttrium oxide (Y.sub.2O.sub.3) 0.25%-1.25%

(15) optionally and especially not more than:

(16) vanadium (V) 0.01%

(17) hafnium (Hf) 0.01%

(18) silver (Ag) 0.005%

(19) lead (Pb) 0.0003%

(20) selenium (Se) 0.0003%

(21) oxygen (O) 0.005%

(22) gallium (Ga) 0.001%

(23) bismuth (Bi) 0.0001%

(24) nitrogen (N) 0.005%

(25) magnesium (Mg) 0.007%

(26) tellurium (Te) 0.00005%

(27) thallium (Tl) 0.0005%

(28) calcium (Ca) 0.0001%

(29) potassium (K) 0.0001%

(30) silicon (Si) 0.02%

(31) manganese (Mn) 0.01%

(32) iron (Fe) 0.02%

(33) copper (Cu) 0.01%

(34) phosphorus (P) 0.005%

(35) sulfur (S) 0.001%

(36) molybdenum (Mo) 0.1%

(37) other impurities 0.1%

(38) nickel (Ni) balance.

(39) The reduced proportion of silicon (Si) and manganese (Mn) distinctly improves cracking behavior.

(40) The low content of sulfur (S) increases the oxidation and corrosion resistance.

(41) The chromium content (Cr) compensates for the proportion of the sigma phase with a higher γ′ content.

(42) The titanium content (Ti) is likewise selected in order to compensate for a γ′ content with a higher proportion of tantalum (Ta) and aluminum (Al).

(43) The content of aluminum (Al) improves creep properties and oxidation resistance.

(44) The contents of zirconium (Zr), iron (Fe), copper (Cu) distinctly reduce propensity to cracking.

(45) The addition of tantalum (Ta) distinctly improves creep properties, and the niobium content (Nb) increases strength.

(46) The addition of yttrium oxide (Y.sub.2O.sub.3) improves oxidation resistance.

(47) The adjustments detailed assure processibility for a productive SLM process with improved mechanical properties and increased oxidation resistance.

(48) No cracking is expected in heat treatment on account of aging phenomena, which has been confirmed experimentally and by simulation, and this reduces reworking expenditure, such as surface treatment.

(49) The method used is preferably selective powder melting or selective powder sintering or application welding, powder application welding, or else selective laser sintering or selective laser melting.

(50) The chromium content (Cr) is preferably 21.0% to 21.5%, especially 21.0% to 21.3%, very particularly 21.0% by weight.

(51) The cobalt content (Co) is preferably 19% by weight.

(52) The content of titanium (Ti) is preferably 3.0% by weight to 3.2% by weight, especially 3.0% by weight to 3.1% by weight, very particularly 3.0% by weight.

(53) The content of aluminum (Al) is preferably 2.2% by weight to 2.4% by weight, especially 2.3% by weight to 2.4% by weight, very particularly 2.4% by weight.

(54) The content of tantalum (Ta) is preferably 1.7% by weight to 1.9% by weight, especially 1.8% by weight to 1.9% by weight, very particularly 1.9% by weight.

(55) The content of niobium (Nb) is preferably 1.4% by weight to 1.6% by weight, especially 1.5% by weight to 1.6% by weight, very particularly 1.6% by weight.

(56) The carbon content (C) is preferably 0.15% by weight.

(57) The tungsten content (W) is preferably 2.0% by weight.

(58) The content of aluminum (Al) is preferably 2.4% by weight to 3.0% by weight, especially 2.6% by weight to 3.0% by weight, very particularly 3.0% by weight.

(59) Advantages are also achieved with a preferable content of tantalum (Ta) of 1.9% by weight to 2.5% by weight, especially 2.2% by weight to 2.5% by weight, very particularly 2.5% by weight.