Vanadium-containing powder metallurgical powders and methods of their use
View Patent ↗Iron-based metallurgical powders comprising vanadium are described, as well as compacted articles made thereof. These articles have improved mechanical properties.
1. A metallurgical powder composition comprising:
about 90% to about 99%, based on the weight of the metallurgical powder composition, of an iron-based metallurgical powder; and
at least one additive that is a prealloy comprising iron, silicon, and vanadium; wherein the additive comprises up to about 20%, based on the weight of the additive, of vanadium, and about 17% to about 45%, based on the weight of the additive, of silicon.
2. The metallurgical powder composition of claim 1 , wherein the total vanadium content of the composition is about 0.2% to about 5% by weight of the composition.
3. The metallurgical powder composition of claim 1 , wherein the total vanadium content of the composition is about 0.2% to about 3.5% by weight of the composition.
4. The metallurgical powder composition of claim 1 , wherein the additive further comprises at least one or more of chromium, nickel, manganese, copper, carbon, boron, or nitrogen.
5. The metallurgical powder composition of claim 1 , wherein the additive comprises up to 15%, based on the weight of the additive, of vanadium.
6. The metallurgical powder composition of claim 1 , wherein the additive comprises about 3% to about 10.5%, based on the weight of the additive, of vanadium.
7. The metallurgical powder composition of claim 6 , wherein the additive comprises about 17% to about 30%, based on the weight of the additive, of silicon.
8. The metallurgical powder composition of claim 1 , wherein the additive comprises about 3% to about 10.5%, based on the weight of the additive, of vanadium, and about 17% to about 30%, based on the weight of the additive, of silicon.
9. The metallurgical powder composition of claim 1 , wherein the additive comprises less than about 0.50%, based on the weight of the additive, of oxygen.
10. The metallurgical powder composition of claim 1 , wherein the metallurgical powder composition comprises about 0.2% to about 5%, based on the weight of the metallurgical powder composition, of the additive.
11. The metallurgical powder composition of claim 10 , wherein the metallurgical powder composition comprises about 3.5%, based on the weight of the metallurgical powder composition, of the additive.
12. The metallurgical powder composition of claim 1 , wherein the additive has a mean particle size (d50) of about 10 to 20 microns.
13. The metallurgical powder composition of claim 1 , wherein the metallurgical powder composition further comprises from about 0.05 weight % to about 2.0 weight % molybdenum, from about 0.1 weight % to about 2.0 weight % nickel, from about 0.05 weight % to about 2.0 weight % graphite, up to about 3.0 weight % copper, or a combination thereof.
14. The metallurgical powder composition of claim 13 , wherein the metallurgical powder composition comprises about 0.05% to about 2.0%, based on the weight of the metallurgical powder composition, of molybdenum.
15. The metallurgical powder composition of claim 14 , wherein the metallurgical powder composition comprises about 0.05% to about 1%, based on the weight of the metallurgical powder composition, of molybdenum.
16. The metallurgical powder composition of claim 15 , wherein the metallurgical powder composition comprises about 0.05% to about 0.35%, based on the weight of the metallurgical powder composition, of molybdenum.
17. The metallurgical powder composition of claim 16 , wherein the metallurgical powder composition comprises about 0.25% to about 0.35%, based on the weight of the metallurgical powder composition, of molybdenum.
18. The metallurgical powder composition of claim 13 , wherein the metallurgical powder composition comprises about 0.1% to about 2.0%, based on the weight of the metallurgical powder composition, of nickel.
19. The metallurgical powder composition of claim 13 , wherein the metallurgical powder composition comprises about 0.05% to about 2.0%, based on the weight of the metallurgical powder composition, of graphite.
20. The metallurgical powder composition of claim 19 , wherein the metallurgical powder composition comprises about 0.7%, based on the weight of the metallurgical powder composition, of graphite.
21. The metallurgical powder composition of claim 13 , wherein the metallurgical powder composition comprises up to about 3.0%, based on the weight of the metallurgical powder composition, of copper.
22. The metallurgical powder composition of claim 21 , wherein the metallurgical powder composition comprises about 2.0%, based on the weight of the metallurgical powder composition, of copper.
23. The metallurgical powder composition of claim 1 , wherein the iron-based metallurgical powder composition is a prealloy.
24. The metallurgical powder composition of claim 1 , wherein the iron-based metallurgical powder composition is essentially free of vanadium.
25. The metallurgical powder composition of claim 1 , wherein the total vanadium content of the metallurgical powder composition is provided by the at least one additive.
26. The metallurgical powder composition of claim 1 , further comprising a lubricant.
27. The metallurgical powder composition of claim 1 , further comprising a binder.
28. A compacted part comprising the metallurgical powder composition of claim 1 .
29. The compacted part of claim 28 , wherein the part is sintered.
30. A method of making a metallurgical powder composition of claim 1 comprising combining an iron based metallurgical powder with an additive that is a prealloy comprising vanadium, iron, and silicon.