Ni-based superalloy powder for additive manufacturing and an article made therefrom
A nickel base superalloy powder for additive manufacturing applications is disclosed. The alloy powder has the following broad weight percent composition: C 0-0.1 Mn 0.5 max. Si 0-0.03 Cr 4-16 Fe 0-1.5 Mo 0-6 W 0-8 Co 0-15 Ti 0-2 Al 0.5-5.5 Nb 0-6 Ta 7.5-14.5 Hf 0-2.0 Zr 0-0.1 Re 0-6 Ru 0-3 B 0-0.03 The balance of the alloy is at least 50% nickel and the usual impurities. An article of manufacture made from the alloy is also disclosed.
1. A high γ′ volume fraction Ni-base alloy for laser and electron beam additive manufacturing processes, said alloy consisting essentially of, in weight percent,
C
0-0.1
Mn
0.5 max.
Si
0-0.03
Cr
8-11
Fe
1 max.
Mo
2-5
W
0.5-6
Co
4-6
Al
3-5
Nb
3.86-5
Ta
7.5-9.5
Hf
0-1.5
Zr
0-0.1
Ru
0-1
B
0-0.03
and the balance of the alloy is nickel and impurities found in commercial grades of Ni-base superalloys intended for the same use and service, said impurities including not more than 0.03% P, and not more than 0.01% each of S, O, and N; wherein
% W+% Mo+% Ru+% Re≤10;
10.5≤% Nb+% Ta≤14.5;
wherein the alloy excludes titanium and rhenium; and
wherein the alloy contains at least 50% nickel.
2. The alloy claimed in claim 1 which contains at least about 9% Cr.
3. The alloy claimed in claim 1 which contains at least about 3.5% W.
4. The alloy claimed in claim 3 which contains not more than about 4.5% W.
5. The alloy claimed in claim 1 which contains not more than about 4% Nb.
6. An article of manufacture made from consolidated alloy powder produced from the alloy claimed in claim 1 , wherein said article consists essentially of a γ phase matrix containing a γ′ strengthening phase and the γ′ phase is present in a volume fraction greater than 35%.
7. The article claimed in claim 6 wherein the volume fraction of the γ′ phase is greater than 50%.
8. The article claimed in claim 6 which is further characterized by having a lattice misfit parameter (δ) that is greater than about −0.1%, wherein the lattice misfit parameter is defined as:
δ
=
2
×
(
α
γ
′
-
α
γ
)
α
γ
′
+
α
γ
and wherein α γ′ is the lattice constant for the γ′ precipitate and α γ is the lattice constant for the γ phase matrix material.
9. A high γ′ volume fraction Ni-base alloy for laser and electron beam additive manufacturing processes, said alloy consisting essentially of, in weight percent,
C
0-0.1
Mn
0.5 max.
Si
0-0.03
Cr
4-11
Fe
1 max.
Mo
0-5
W
0.5-8
Co
0-6
Al
3-3.95
Nb
3.86-5
Ta
7.5-9.5
Hf
0-1.5
Zr
0-0.1
Re
0-1
Ru
0-1
B
0-0.03
and the balance of the alloy is nickel and impurities found in commercial grades of Ni-base superalloys intended for the same use and service, said impurities including not more than 0.03% P, and not more than 0.01% each of S, O, and N; wherein
% W+% Mo+% Ru+% Re≤10;
10.5≤% Nb+% Ta≤14.5;
wherein the alloy excludes titanium; and
wherein the alloy contains at least 50% nickel.
10. The alloy claimed in claim 9 wherein rhenium is excluded.