Processing method for the production of nanoscale/near nanoscale steel sheet
View Patent ↗The present disclosure relates to an iron alloy sheet comprising α-Fe, and/or γ-Fe phases wherein the alloy has a melting point in the range of 800 to 1500° C., a critical cooling rate of less than 10 5 K/s and structural units in the range of about 150 nm to 1000 nm.
1. A method of producing an iron alloy sheet comprising:
melting an iron alloy comprising iron, boron, carbon, silicon, chromium, and manganese to obtain an iron alloy melt wherein said iron alloy has a melting point in the range of 1100° C. to 1500° C. and a critical cooling rate for metallic glass formation of less than 10 5 K/s; and
cooling said iron alloy melt using a twin belt casting process into a sheet having a thickness of 0.3 mm to 30 mm, by cooling said iron alloy melt between an upper belt and a lower belt, wherein said belts are separated by a distance wherein the distance between the belt surfaces are reduced along the belt length compensating for the shrinkage of said iron alloy and providing constant pressure on said iron alloy as it cools, wherein said sheet is cooled at a rate of less than 10 4 K/s to produce no metallic glass and structural units in the range of 150 nm to 1000 nm, and/or 10 nm to 150 nm wherein said sheet includes α-Fe, γ-Fe and complex borocarbide phases, and wherein said sheet exhibits a hardness HV 300 in the range of 100 kg/mm 2 to 3,000 kg/mm 2 , a tensile strength in the range of 100,000 lb/in 2 to 950,000 lb/in 2 , a tensile elongation at room temperature in the range of 1% to 40% and a tensile elongation at temperatures greater than room temperature in the range of 1% to 280%.
2. The method of claim 1 further including iron alloy having structural units of greater than or equal to 1 micron.
3. The method of claim 1 wherein said iron alloy component further comprises phases selected from the group consisting of complex carbide, complex boride, and combinations thereof.
4. The method of claim 1 wherein said iron alloy component comprises about 50% by vol. or greater structural units in the range of about 150 nm to 1000 nm.
5. The method of claim 1 comprising about 50% by vol. or greater of structural units in the range of about 10 nm to 150 nm.
6. The method of claim 1 wherein said iron alloy is undercooled in the range of 500° C. to 1000° C.
7. The method of claim 1 wherein said sheet has a thickness of 0.5 mm to 30 mm.
8. A method of producing an iron alloy sheet comprising:
melting an iron alloy comprising iron, boron, carbon, silicon, chromium, niobium, and manganese to obtain an iron alloy melt wherein said iron alloy has a melting point in the range of 1100° C. to 1500° C.; and
cooling said iron alloy melt into a sheet having a thickness of 0.3 mm to 30 mm, wherein said sheet is cooled at a rate of less than 10 4 K/s to produce no metallic glass and structural units in the range of 150 nm to 1000 nm, and/or 10 nm to 150 nm, wherein said sheet includes α-Fe, γ-Fe and complex borocarbide phases, and wherein said sheet exhibits a hardness HV 300 in the range of 100 kg/mm 2 to 3,000 kg/mm 2 , a tensile strength in the range of 100,000 lb/in 2 to 950,000 lb/in 2 , a tensile elongation at room temperature in the range of 1% to 40% and a tensile elongation at temperatures greater than room temperature in the range of 1% to 280%.