# US 12,000,025 B2 · Powder composition for additive manufacturing

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- Number: US 12,000,025 B2
- Document ID: US12000025B2
- Status: Granted
- Kind: B2
- Application number: 17/050,802
- Filed: 2019-04-25
- Published: 2021-03-25
- Granted: 2024-06-04
- Earliest claimed: 2018-04-25
- Assignees: Satyajeet Sharma
- Applicants: Satyajeet Sharma
- Inventors: Satyajeet Sharma
- Web page: https://patentgrep.com/patent/US12000025B2

## CPC

- C22C 19/056: {with the maximum Cr content being at least 10% but less than 20%}
- B22F 1/00: Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F 10/00: Additive manufacturing of workpieces or articles from metallic powder (apparatus or devices therefor B22F12/00)
- B33Y 10/00: Processes of additive manufacturing
- B33Y 70/00: Materials specially adapted for additive manufacturing
- B33Y 80/00: Products made by additive manufacturing
- B22F 2301/15: Nickel or cobalt
- Y02P 10/25: Process efficiency
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

738LC composition belongs to Ni-based super-alloy family. The alloy has been successfully used for hot section of turbine engine. Blades, Vanes and heat shields are made out of the alloy which can sustain a working temperature of 700 to 850 deg C. Additive manufacturing processes like Selective laser melting or PBF-L are not successful in using the alloy powder due to cracking issues. 738LC is also known to fall under the category of non-weldable alloys due to high content of gamma prime phase. The invention of the new composition is outside the standard 738LC with different concentration, morphology and size distribution of gamma prime phase. The invention has shown to eliminate the cracking issue in AM laser based process. The room temperature tensile properties observed are much better than cast 738LC properties.

## Claims

### Claim 1

A Ni-based alloy powder comprising a composition corresponding to a modified 738LC alloy powder, wherein the composition comprises:
Chromium between 15.7 and 16.3 wt %,
Cobalt between 8 and 9 wt %,
Aluminum between 3.2 and 3.7 wt %,
Titanium between 3.2 and 3.7 wt %,
Tungsten between 2.4 and 2.8 wt %,
Tantalum between 1.5 and 2 wt %,
Molybdenum between 1.5 and 2 wt %,
Niobium between 0.6 and 1.1 wt %,
Carbon between 0.09 and 0.13 wt %,
Zirconium between 0.03 and 0.08 wt %,
Boron at most 0.007 wt %,
Iron between 3.5 and 4 wt %,
Copper at most 0.1 wt %,
Manganese at most 0.02 wt %,
Silicon at most 0.03 wt %,
Phosphorus at most 0.015 wt %,
Sulfur at most 0.006 wt %
Oxygen at most 0.03 wt %,
Nitrogen at most 0.08%,
Total all others at most 0.15 wt %, and
remainder Nickel;
wherein the powder comprises a total of 6.5 to 7.2 wt % Aluminum and Titanium.

### Claim 2 (depends on 1)

A 3D-printed component comprising a material composition according to the Ni-based alloy powder of claim 1.