Sintered alloy articles and methods of making the same

Patent metadata

Field	Value
Publication number	US-12331382-B2
Application number	US-201916404011-A
Country	US
Kind code	B2
Filing date	May 6, 2019
Priority date	May 6, 2019
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

Powder alloy compositions and associated additive manufacturing techniques are described herein for production of sintered articles with microstructure and/or enhanced wear and corrosion resistance. In some embodiments, an article comprises sintered cobalt-based alloy having chromium carbide precipitates dispersed therein, the chromium carbide precipitates having an average size less than 4 μm.

First claim

The invention claimed is:

1. An article comprising:
sintered powder cobalt-based alloy having chromium carbide precipitates dispersed therein, the chromium carbide precipitates having an average size less than 4 μm.

2. The article of claim 1 , wherein the chromium carbide precipitates have an average size less than 3 μm.

3. The article of claim 1 , wherein the chromium carbide precipitates comprise a mixture of cubic carbide precipitated and non-cubic carbide precipitates.

4. The article of claim 1 , wherein the chromium carbide precipitates comprise Cr 7 C 3 , Cr 23 C 6 or mixtures thereof.

5. The article of claim 1 , wherein the average particle size of the chromium carbide precipitates has a standard deviation of less than 1 μm.

6. The article of claim 1 , wherein the chromium carbide precipitates have a D90 of less than 8 μm.

7. The article of claim 1 , wherein the chromium carbide precipitates have a D50 of less than 4 μm.

8. The article of claim 1 , wherein a 1000 μm 2 region in a cross-sectional scanning electron micrograph contains, on average, at least 200 chromium carbide precipitates.

9. The article of claim 1 , wherein the sintered powder cobalt-based alloy is at least 99 percent theoretical density.

10. The article of claim 1 , wherein the sintered powder cobalt-based alloy is free of surface cracks.

11. The article of claim 1 , wherein the cobalt based alloy comprises 27-31 wt. % chromium, 2-5 wt. % tungsten, 1-3 wt. % nickel, 0.1-1 wt. % manganese, 0.5-3 wt. %- iron, 0.5-2 wt. % carbon, 0-2 wt. % silicon, 0-2 wt. % boron and the balance cobalt.

12. The article of claim 1 , wherein the cobalt alloy comprises silicon and/or boron in individual amounts of 0.1-2 wt. %.

13. The article of claim 11 , wherein the cobalt alloy comprises silicon and boron in individual amounts of 0.1-2 wt. %.

Assignees

• Kennametal Inc

Inventors

• Perez Martin G
• Prichard Paul D
• Yao Matthew
• Skwara John
• Belhadjhamida Abdelhakim
• Gamble Kevin M
• Meyer Michael J

Classifications

• B22F10/34

  of powder characteristics, e.g. density, oxidation or flowability · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• B22F10/14

  by jetting of binder onto a bed of metal powder · CPC title

• B22F2301/15

  Nickel or cobalt · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title