Apparatus for heat treating metals and heat treatment method

Abstract

An apparatus for heat treating metals includes a container configured for receiving a metal therein for heat treatment, a first power supply configured for generating a first electric field and applying a first voltage U1 represented by a following formula: U 1 = { u 1  cos  ( 2   π   f   t )  ( ( 2  n + 1 / 2 )  π ≤ 2  π   f   t ≤ ( 2  n + 3 / 2 )  π ) - u 2  ( 2   n   π < 2   π   f   t ≤ ( 2  n + 1 / 2 )  π , ( 2   n + 3 / 2 )  π ≤ 2   π   f   t ≤ ( 2  n + 2 )  π ) , and a second power supply configured for generating a second electric field having opposite direction to the first electric field applying a second voltage U2 represented by a following formula: U 2 = { - u 1  cos  ( 2   π   f   t )  ( 2   n   π < 2   π   f   t ≤ ( 2  n + 1 / 2 )  π , ( 2  n + 3 / 2 )  π ≤ 2  π   f   t ≤ ( 2  n + 2 )  π ) u 2  ( ( 2  n + 1 / 2 )  π ≤ 2   π   f   t ≤ ( 2  n + 3 / 2 )  π ) , wherein n represents integer great than or equal to 0, u1 is in a range from 50 Volts to 1000 Volts, u2 is in a range from 25 Volts to 50 Volts, f represents frequency in range from 104 Hz to 106 Hz, and t represents time.

Dependencies are inferred from the claim text.