Iron based alloy suitable for providing a hard and wear resistant coating on a substrate, article having a hard and wear resistant coating, and method for its manufacture

Patent metadata

Field	Value
Publication number	US-11359268-B2
Application number	US-201716622961-A
Country	US
Kind code	B2
Filing date	Jun 21, 2017
Priority date	Jun 21, 2017
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

The present invention relates to an iron-based alloy that is able to provide a coating on a substrate, the coating having simultaneously high hardness and wear resistance. The iron-based alloy consists of 3.0-7.0% by weight Cr; 1.3-3.0% by weight C; 0.2-2.0% by weight B; 2.0-10.0% by weight V; optionally 1.5% by weight or less Si; optionally 1.0% by weight or less Mn, optionally 2.0% by weight or less Mo; optionally 1.5% by weight or less Ni; the balance being Fe and unavoidable impurities.The present invention further relates to an article comprising a substrate and coating formed thereon, the coating being formed from the alloy, and to a method for forming a coated article. The method preferably employs HVOF, laser cladding or plasma cladding.

First claim

The invention claimed is:

1. An iron-based alloy, consisting of
3.0-7.0% by weight Cr;
1.3-3.0% by weight C;
0.3-2.0% by weight B;
2.0-10.0% by weight V;
1.5% by weight or less Ni, wherein the content of Ni is greater than 0;
optionally 1.5% by weight or less Si;
optionally 1.0% by weight or less Mn,
optionally 2.0% by weight or less Mo;
the balance being Fe and unavoidable impurities.

2. The iron-based alloy according to claim 1 , wherein the content of Cr is from 3.2-6.8% by weight.

3. The iron-based alloy according to claim 1 , wherein the content of B is from 0.3-1.2% by weight.

4. The iron-based alloy according to claim 1 , wherein the content of Ni is greater than 0 and is 1.0% by weight or less.

5. The iron-based alloy according to claim 1 , wherein the content of Mo is greater than 0.

6. The iron-based alloy according to claim 1 , wherein the content of V is from 4.0 to 8.0% by weight.

7. The iron-based alloy according to claim 1 , wherein the content of C is from 1.5-2.8% by weight.

8. The iron-based alloy according to claim 1 , wherein the content of the optional components Si, Mn, and Mo is each 1.0% by weight or less.

9. An article having a substrate and a coating, the coating being formed from an iron-based alloy as defined in claim 1 .

10. The article according to claim 9 , wherein the substrate is made of a metal or metal alloy.

11. Article according to claim 9 , which is a hydraulic cylinder or roller used in the mining or steel industry.

12. The article according to claim 11 , wherein the coating has both
a hardness of 60 HRC or greater as measured by SS-EN ISO 6508-1:2016; and
a wear of 25 mm 3 or less according to ASTM G65-16, Procedure A.

13. The article according to claim 9 , wherein the coating is formed by laser cladding, plasma powder cladding or plasma transfer arc, wherein the content of the optional components Si, Mn, and Mo is each 1.0% by weight or less in the iron-based alloy powder.

14. The iron-based alloy according to claim 1 , which is in powder form.

15. A method of forming a coating on a substrate with the iron-based alloy according to claim 1 .

16. An iron-based alloy, consisting of
3.0-7.0% by weight Cr;
1.3-3.0% by weight C;
0.3-2.0% by weight B;
2.0-10.0% by weight V;
optionally 1.5% by weight or less Si;
optionally 1.0% by weight or less Mn,
optionally 2.0% by weight or less Mo;
optionally 1.5% by weight or less Ni;
the balance being Fe and unavoidable impurities,
wherein the iron-based alloy is in powder form.

17. The iron-based alloy according to claim 16 , wherein the powder contains no or less than 2% by weight of particles having a particle size exceeding 250 μm as measured by sieve analysis according to ASTM B214-16.

18. The iron-based alloy in powder form according to claim 16 , which consists of particles having a particle size between 5-200 μm as measured by sieve analysis according to ASTM B214-16.

19. The iron-based alloy in powder form according to claim 16 , which consists of particles having a particle size between 20-200 μm as measured by sieve analysis according to ASTM B214-16.

20. A method for forming a coated article, comprising the steps of
providing a substrate, and
forming a coating on the substrate,
wherein the step of forming the coating utilizes an alloy powder as defined in claim 16 .

21. The method for forming a coated article according to claim 20 , wherein the step of forming a coating is a laser cladding step, a plasma powder cladding step, a plasma transfer arc step or a HVOF step.

22. The method for forming a coated article according to claim 20 , wherein the article is a hydraulic cylinder or roller used in the mining or steel industry.

Assignees

• Hoeganaes Ab Publ
• Hoeganaes Germany Gmbh

Inventors

• Cao Cecilia
• Liu Crystal
• Vesterling Kari
• Wang Erik
• HALLéN HANS

Classifications

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title

• B22F2003/242

  Coating · CPC title

• C22C38/44

  with molybdenum or tungsten · CPC title

• B22F3/115

  by spraying molten metal, i.e. spray sintering, spray casting · CPC title

• C22C38/02

  containing silicon · CPC title