Stainless steel alloys and turbocharger kinematic components formed from stainless steel alloys
Stainless steel alloys, and turbocharger kinematic components fabricated from such alloys (for example by sintering), are provided. A stainless steel alloy, or component fabricated therefrom, includes, by weight, about 20% to about 35% chromium, about 10% to about 15% nickel, about 10% to about 15% cobalt, about 10% to about 15% molybdenum, about 2.0% to about 4.0% carbon, about 0.4% to about 2.5% silicon, about 0.0% to about 1.0% niobium, and a balance of iron and other inevitable/unavoidable impurities.
1. A turbocharger kinematic component configured for operation at temperatures up to about 1050° C., comprising:
a sintered iron-based alloy, wherein the sintered iron-based alloy comprises, by weight:
about 20% to about 35% chromium;
about 10% to about 15% nickel;
about 10% to about 15% cobalt;
about 10% to about 15% molybdenum;
about 2.0% to about 4.0% carbon;
about 0.4% to about 2.5% silicon;
about 0.0% to about 1.0% niobium; and
a balance of iron and inevitable/unavoidable impurities, wherein the element manganese is excluded beyond impurity levels.
2. The turbocharger kinematic component of claim 1 comprising about 22% to about 33% chromium.
3. The turbocharger kinematic component of claim 1 comprising about 24% to about 31% chromium.
4. The turbocharger kinematic component of claim 1 comprising about 26% to about 29% chromium.
5. The turbocharger kinematic component of claim 1 comprising about 11% to about 14% nickel.
6. The turbocharger kinematic component of claim 1 comprising about 12% to about 13% nickel.
7. The turbocharger kinematic component of claim 1 comprising about 11% to about 14% cobalt.
8. The turbocharger kinematic component of claim 1 comprising about 12% to about 13% cobalt.
9. The turbocharger kinematic component of claim 1 comprising about 2.5% to about 3.5% carbon.
10. The turbocharger kinematic component of claim 1 comprising about 0.3% to about 0.7% niobium.
11. The turbocharger kinematic component of claim 1 , wherein the turbocharger kinematic component is selected from the group consisting of: a vane and unison ring assembly of a variable geometry turbocharger, and a waste-gate assembly of a turbocharger.