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:
from 90% to 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 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;
wherein the total vanadium content of the composition is about 0.05% to about 1.0% by weight of the composition.
2. The metallurgical powder composition of claim 1 , wherein the additive further comprises at least one or more of chromium, nickel, manganese, copper, carbon, boron, and nitrogen.
3. The metallurgical powder composition of claim 1 , wherein the additive comprises about 3% to about 7%, based on the weight of the additive, of vanadium, and about 17% to about 21%, based on the weight of the additive, of silicon.
4. 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.
5. 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.
6. The metallurgical powder composition of claim 5 , wherein the metallurgical powder composition comprises about 3.5%, based on the weight of the metallurgical powder composition, of the additive.
7. The metallurgical powder composition of claim 1 , wherein the additive has a mean particle size (d50) of about 10 to 20 microns.
8. 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.
9. The metallurgical powder composition of claim 8 , wherein the metallurgical powder composition comprises about 0.05% to about 2.0%, based on the weight of the metallurgical powder composition, of molybdenum.
10. The metallurgical powder composition of claim 9 , wherein the metallurgical powder composition comprises about 0.05% to about 1%, based on the weight of the metallurgical powder composition, of molybdenum.
11. The metallurgical powder composition of claim 10 , wherein the metallurgical powder composition comprises about 0.05% to about 0.35%, based on the weight of the metallurgical powder composition, of molybdenum.
12. The metallurgical powder composition of claim 11 , wherein the metallurgical powder composition comprises about 0.25% to about 0.35%, based on the weight of the metallurgical powder composition, of molybdenum.
13. The metallurgical powder composition of claim 8 , wherein the metallurgical powder composition comprises about 0.1% to about 2.0%, based on the weight of the metallurgical powder composition, of nickel.
14. The metallurgical powder composition of claim 8 , wherein the metallurgical powder composition comprises about 0.05% to about 2.0%, based on the weight of the metallurgical powder composition, of graphite.
15. The metallurgical powder composition claim 14 , wherein the metallurgical powder composition comprises about 0.7%, based on the weight of the metallurgical powder composition, of graphite.
16. The metallurgical powder composition of claim 8 , wherein the metallurgical powder composition comprises up to about 3.0%, based on the weight of the metallurgical powder composition, of copper.
17. The metallurgical powder composition of claim 16 , wherein the metallurgical powder composition comprises about 2.0%, based on the weight of the metallurgical powder composition, of copper.
18. The metallurgical powder composition of claim 1 , wherein the iron-based metallurgical powder composition is a prealloy.
19. The metallurgical powder composition of claim 1 , wherein the iron-based metallurgical powder composition is essentially free of vanadium.
20. 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.
21. The metallurgical powder composition of claim 1 , further comprising a lubricant.
22. The metallurgical powder composition of claim 1 , further comprising a binder.
23. A compacted part comprising the metallurgical powder composition of claim 1 .
24. The compacted part of claim 23 , wherein the part is sintered.