Crack resistant hardfacing alloys

Patent metadata

Field	Value
Publication number	US-11130205-B2
Application number	US-201514733519-A
Country	US
Kind code	B2
Filing date	Jun 8, 2015
Priority date	Jun 9, 2014
Publication date	Sep 28, 2021
Grant date	Sep 28, 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 hardfacing deposit, wherein the hardfacing deposit comprises:
Fe and about 0.68 wt. % to about 1.25 wt. % C; and
a matrix comprising at least 50% martensite by volume, a macro-hardness of 57 HRC or greater, and a high resistance to stress cracking and hot tearing when welded as a single layer or over a worn existing hardfacing layer;
wherein a minimum carbon level in the matrix is 0.6 wt. %;
wherein the hardfacing deposit contains greater than 0 volume % grain boundary carbides and/or borides and less than about 15% grain boundary carbides and/or borides; and
wherein the hardfacing deposit has high abrasion resistance as characterized by an ASTM G65A mass loss of less than 0.5 grams.

2. The hardfacing deposit of claim 1 , wherein the hardfacing deposit contains both carbide and boride precipitates when welded over a worn existing hardfacing layer.

3. The hardfacing deposit of claim 1 , wherein the hardfacing deposit comprises Fe and, in wt. %:
B: about 0.6 to about 0.9;
Cr: about 14.25 to about 26; and
Nb+Ti+V: about 3.5 to about 4.5.

4. The hardfacing deposit of claim 3 , wherein the hardfacing deposit further comprises, in wt. %:
Mn: about 1.1;
Mo: about 1; and
Si: about 0.5.

5. The hardfacing deposit of claim 1 , wherein the hardfacing deposit comprises Fe and, in wt. %:
B: 1;
C: 0.8;
Cr: 16; and
Nb: 3.5.

6. The hardfacing deposit of claim 5 , wherein the hardfacing deposit does not contain Mn, Mo, Si, Ti, V, W, or Zr.

7. The hardfacing deposit of claim 1 , wherein the matrix comprises at least 90% martensite by volume.

8. The hardfacing deposit of claim 1 , wherein a majority of a composition of the hardfacing deposit is Fe.

9. The hardfacing deposit of claim 1 , wherein the hardfacing deposit contains less than about 10% grain boundary carbides and/or borides.

10. The hardfacing deposit of claim 1 , wherein the hardfacing deposit contains less than about 5% grain boundary carbides and/or borides.

11. The hardfacing deposit of claim 1 , wherein the hardfacing deposit is formed from a wire.

12. The hardfacing deposit of claim 11 , wherein the wire comprises Fe and, in wt. %:
C: about 0.75 to about 1.25;
B: about 0.6 to about 0.9;
Cr: about 14.25 to about 26; and
Nb+Ti+V: about 3.5 to about 4.5.

Assignees

• Oerlikon Metco Us Inc

Inventors

• Cheney Justin Lee

Classifications

• C22C38/04

  containing manganese · CPC title

• C22C38/22

  with molybdenum or tungsten · CPC title

• B23K35/22

  characterised by the composition or nature of the material · CPC title

• C22C38/02

  containing silicon · CPC title

• B23K35/3601

  with inorganic compounds as principal constituents · CPC title