Crack resistant hardfacing alloys

Patent metadata

Field	Value
Publication number	US-11111912-B2
Application number	US-201916241715-A
Country	US
Kind code	B2
Filing date	Jan 7, 2019
Priority date	Jun 9, 2014
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

Embodiments of an alloy that can be resistant to cracking. In some embodiments, the alloy can be advantageous for use as a hardfacing alloys, in both a diluted and undiluted state. Certain microstructural, thermodynamic, and performance criteria can be met by embodiments of the alloys that may make them advantageous for hardfacing.

First claim

What is claimed is:

1. A Fe-based welding feedstock material comprising Fe and, in wt. %:
B: 0.7 to 0.9;
Mo: 0.91 to 1.1;
Nb: 3.03 to 3.7;
Cr: 14.11 to 14.5;
Ti: 0.35 to 0.6;
V: 0.38 to 0.56;
C: 0.8 to 1.0;
Mn: 0.83 to 1.31; and
Si: 0.35 to 0.59,
wherein the welding feedstock material is configured to form a matrix and a liquid, wherein the liquid has a minimum carbon level of about 0.5 wt. % or greater.

2. The Fe-based welding feedstock material of claim 1 , wherein the welding feedstock material is a wire.

3. The Fe-based welding feedstock material of claim 1 , wherein the welding feedstock material is a powder.

4. The Fe-based welding feedstock material of claim 1 , wherein the matrix is characterized by having a maximum grain boundary formation temperature gap of about 80K.

5. The Fe-based welding feedstock material of claim 1 , wherein the matrix is characterized by having a maximum grain boundary formation temperature gap of about 50K.

6. The Fe-based welding feedstock material of claim 1 , wherein the matrix is characterized by having a maximum grain boundary formation temperature gap of about 0K.

7. The Fe-based welding feedstock material of claim 1 , wherein the matrix is characterized by having a maximum eutectic carbide/boride phase fraction of 15 mole %.

8. The Fe-based welding feedstock material of claim 1 , wherein the minimum carbon level of the liquid is about 0.5 wt. %.

9. The Fe-based welding feedstock material of claim 1 , wherein the minimum carbon level of the liquid is about 0.7 wt. % or greater.

10. The Fe-based welding feedstock material of claim 1 , wherein the minimum carbon level of the liquid is about 0.9 wt. % or greater.

11. The Fe-based welding feedstock material of claim 1 , wherein the matrix has both borides and carbides and is characterized by having carbides which are thermodynamically stable at a temperature equal to or greater than 80K below a liquidus temperature of the matrix.

12. A coating on a substrate formed from the Fe-based welding feedstock material of claim 1 .

13. The coating on the substrate of claim 12 , wherein the coating has a macro-hardness of 50 HRC or greater.

14. The coating on the substrate of claim 12 , wherein the coating contains greater than 0 volume % grain boundary carbides and/or borides but less than 15 volume % grain boundary precipitates.

15. The coating on the substrate of claim 12 , wherein the coating has an ASTM G65A mass loss of less than 0.5 grams.

16. The coating on the substrate of claim 12 , wherein the coating contains both carbides and borides.

17. The coating on the substrate of claim 12 , wherein the coating is at least 10% by volume martensite.

18. The coating on the substrate of claim 12 , wherein the coating is at least 90% by volume martensite.

19. A method of applying a coating, the method comprising welding the Fe-based welding feedstock material of claim 1 onto a substrate.

Assignees

• Oerlikon Metco Us Inc

Inventors

• Cheney Justin Lee

Classifications

• B23P6/04 Primary

  Repairing fractures or cracked metal parts or products, e.g. castings · CPC title

• C22C38/04

  containing manganese · CPC title

• B23K35/3086

  containing Ni or Mn · CPC title

• B23K35/308

  with Cr as next major constituent · CPC title

• C22C38/22

  with molybdenum or tungsten · CPC title