Austenitic iron-based alloy
View Patent ↗The method of forming hard facing on an engine valve comprising providing an engine valve, providing an austenitic iron-based alloy, the austenitic iron-based alloy including, by weight, about 0.25% to about 0.9% carbon, about 1.5% to about 3.5% boron, about 1% to about 2% silicon, at least 20% chromium, an amount of manganese effective to provide the iron-based alloy with an austenitic structure, and the balance including iron and incidental impurities, and welding the austenitic iron-based alloy to at least a portion of the engine valve.
1. A method of forming hard facing on an engine valve, the method comprising:
providing an engine valve;
providing an austenitic iron-based alloy, the austenitic iron-based alloy including, by weight, about 0.25% to about 0.9% carbon, about 1.5% to about 3.5% boron, about 1% to about 2% silicon, at least 20% chromium, an amount of manganese effective to provide the iron-based alloy with an austenitic structure, and the balance including iron and incidental impurities; and
welding the austenitic iron-based alloy to at least a portion of the engine valve.
2. The method of claim 1 , the austenitic iron-based alloy being substantially free of nickel.
3. The method of 1 , the austenitic iron-based alloy comprising about 18 wt % to about 30 wt. % of manganese and the chromium comprising 20 wt. % to about 35 wt. % of the austenitic iron-based alloy.
4. The method of claim 1 , the austenitic iron-based alloy being provided on at least a portion of the valve by plasma transfer arc welding.
5. The method of claim 1 , the valve including a valve face and the austenitic iron-based alloy being provided on the valve face to form the hard facing.