Forging method

Abstract

Provided is a forging method for highly increasing hardness of a forged product as well as suppressing a decrease in the hardness in a use environment. The forging method includes a warm-forging step (S 105 ) of warm-forging a metallic workpiece 10 which has been solutionized; and an artificial aging step (S 106 ) of artificially aging the workpiece 10 after the warm-forging step (S 105 ) in advance, at equal to an environmental temperature or higher than a temperature at which a product of the workpiece is used after production. Here, an equivalent plastic strain of the workpiece that increases between before and after the warm-forging step is in the range from 0.1 to 2.5.

1 . A forging method comprising:
 a warm-forging step of warm-forging a metallic workpiece which has been solutionized, at a recrystallization temperature or below; and   an artificial aging step of artificially aging the workpiece in advance after the warm-forging step, at equal to an environmental temperature or higher than a temperature at which a product of the workpiece is used after production.   
     
     
         2 . The forging method described in  claim 1 , wherein an equivalent plastic strain that increases between before and after the warm-forging step is in the range from 0.1 to 2.5. 
     
     
         3 . The forging method described in  claim 1 , wherein an equivalent plastic strain that increases between before and after the warm-forging step is in the range from 0.4 to 2.1.