Ni-Based Superalloy Powder for Additive Manufacturing and an Article Made Therefrom
a technology of additive manufacturing and superalloy powder, which is applied in the direction of manufacturing tools, welding/cutting media/materials, and manufacturing tools, etc., can solve the problem of large temperature gradient that occurs in parts during solidification, and achieve superior elevated temperature strength and creep resistance, and high ′ volume fraction
Inactive Publication Date: 2021-06-17
CRS HLDG LLC
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Benefits of technology
The present invention provides an alloy powder that has a broad and intermediate weight percent range for various elements such as nickel, titanium, chromium, and molybdenum. The alloy powder also has a preferred weight percent composition of nickel, W, Mo, and ruthenium. The alloy powder is designed to address the problems associated with strain-age cracking and internal stress buildup during cooling and aging heat treatment. The alloy powder has a high γ′ volume fraction and is strain-age cracking resistant while retaining high strength and creep resistance. The alloy powder can be used in the selective laser additive manufacturing process and is optimized for the age hardened condition. The alloy powder can be consolidated to produce an article with a high γ′ phase in gamma (γ) phase matrix and a lattice misfit parameter greater than about -0.1%.
Problems solved by technology
The drawback of laser melting system is the large temperature gradient that occurs in a part during solidification.
Method used
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[0054]In order to demonstrate the desirable combination of properties provided by the alloy of this invention, a set of comparative examples were melted, processed, and tested. Set forth in Table 1 below are the weight percent compositions of four heats that were melted and tested.
TABLE 1AlCoCrHfMoNbTaTiWNiExample 1 4.055.01 9.790 2.963.867.930 0.86Bal1Example 2 4.091.62 9.780 2.963.079.360 0.75Bal1Example 3 3.950.115.81.18 0.990 9.370.527.37Bal1CM247LC25.69.278.21.390.6—3.290.649.2161.651Balance includes usual impurity elements.2Also includes 0.03% Zr, 0.014% B, and 0.082% C.
[0055]Examples 1, 2, and 3 were melted under vacuum and cast into ingots which were given a homogenization heat treatment after solidification. Examples 1 and 2 were solution heat treated at 2250° F. (1232° C.) for one hour and quenched in water. Example 3 was gas quenched from the homogenization temperature in a chamber backfilled with 10 bar of nitrogen. The CM247LC example was melted under vacuum, hom...
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Abstract
A nickel base superalloy powder for additive manufacturing applications is disclosed. The alloy powder has the following broad weight percent composition:C 0-0.1Mn0.5 max.Si 0-0.03Cr 4-16Fe 0-1.5Mo0-6W0-8Co 0-15Ti0-2Al0.5-5.5Nb0-6Ta 7.5-14.5Hf 0-2.0Zr 0-0.1Re0-6Ru0-3B 0-0.03The balance of the alloy is at least 50% nickel and the usual impurities. An article of manufacture made from the alloy is also disclosed.
Description
CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Patent Application No. 62 / 795,618, filed Jan. 23, 2019, the entirety of which is incorporated herein by reference.BACKGROUND OF THE INVENTIONField of the Invention[0002]This invention relates generally to Ni-based superalloys and in particular to a Ni-based superalloy powder that is useful in an additive manufacturing process for making articles therefrom.Description of the Related Art[0003]With the advent of additive manufacturing technologies, manufacturers of turbomachinery (high temperature gas turbines and jet engines) are looking at leveraging the design flexibility offered by the additive manufacturing process to directly produce parts with complex features for use in the hot gas path of gas turbines and jet engines. A powder bed fusion technique using selective laser melting is one of the most promising additive manufacturing techniques. Compared with the known electron beam p...
Claims
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Login to View More IPC IPC(8): C22C19/05B33Y70/00
CPCC22C19/057B33Y70/00C22C1/0433C22C19/007C22F1/10B23K35/3033B23K26/342C22C19/03Y02P10/25B22F10/64B22F10/36B22F10/28B22F10/38B22F10/366C22C19/056B33Y80/00
Inventor ZHOU, NINGSTRITCH, KYLE B.WANG, TAOFORSIK, STEPHANE A.J.COLOMBO, GIAN A.KERNION, SAMUEL J.EPLER, MARIO E.DICUS, AUSTIN
Owner CRS HLDG LLC