Patent ID: 9493855
Filing Date: 2016-11-15
CPC Classification: C21D,C22C

Claim Text:
1. A method comprising: supplying a metal alloy comprising Fe at 48.0 to 81.0 atomic percent, B at 2.0to 8.0atomic percent, Si at 4.0 to 14.0 atomic percent, Cu at 0.1 to 6.0 atomic percent and Mn at 10.5 to 21.0 atomic percent and optionally Ni present at 0.1 to 16.0 atomic percent; melting said alloy and solidifying, without quenching, to form a matrix grain size of 500 nm to 20,000 nm and a boride grain size of 25 nm to 500 nm; mechanical stressing, or heating and mechanical stressing said alloy form at least one of the following: (a) matrix grain size of 500 nm to 20,000 nm, boride grains of 25 nm to 500 nm, precipitation grain size of 1 nm to 200 nm wherein said alloy indicates a yield strength of 400 MPa to 1300 MPa, tensile strength of 700 MPa to 1400 MPa and a tensile elongation of 10% to 50%; (b) refined matrix grain size of 100 nm to 2000 nm, precipitation grain size of 1 nm to 200 nm, boride grain size of 200 nm to 2500 nm where the alloy has yield strength of 300 MPa to 800 MPa; and heating of the alloy (a) or alloy (b) at a temperature of 200° C. to 850° C. for a time period of up to 1 hour wherein upon cooling there is no eutectoid transformation.