Patent ID: 8257512

Claim:
A method comprising: supplying a metal alloy comprising Fe at a level of 53.5 to 72.1 atomic percent, Cr at 10.0 to 21.0 atomic percent, Ni at 2.8 to 14.50 atomic percent, B at 4.0 to 8.0 atomic percent, Si at 4.0 to 8.0 atomic percent; melting said alloy and solidifying to provide a matrix grain size in the range of 500 nm to 20,000 nm and a boride grain size in the range of 25 nm to 500 nm; mechanical stressing said alloy and/or heating to form at least one of the following grain size distributions and mechanical property profiles, wherein said boride grains provide pinning phases that resist coarsening of said matrix grains: (a) matrix grain size in the range of 500 nm to 20,000 nm, boride grain size in the range of 25 nm to 500 nm, precipitation grain size in the range of 1 nm to 200 nm wherein said alloy indicates a yield strength of 300 MPa to 840 MPa, tensile strength of 630 MPa to 1100 MPa and tensile elongation of 10 to 40%; or (b) matrix grain size in the range of 100 nm to 2000 nm and boride grain size in the range of 25 nm to 500 nm which has a yield strength of 300 MPa to 600 MPa.