Process for producing Fe-based member having high young's modulus and high toughness

Abstract

The present invention produces an Fe-based member having a high Young's modulus and a high toughness. In producing an Fe-based member, a first step and a second step are sequentially carried out. At the first step, an Fe-based material comprising 1.5% by weight≦C≦2.5% by weight 1.4% by weight≦Si≦3.5% by weight 0.9% by weight≦Mn≦1.7% by weight 0.5% by weight≦Ni≦1.5% by weight, and the balance of Fe including inevitable impurities is subjected to a thermal treatment at a heating temperature set in a range of TS<T1<TL and under a quenching condition, wherein TS represents a solidus temperature of the Fe-based material, and TL represents a liquidus temperature. Then, at the second step, the resulting Fe-based material is subjected to a thermal treatment at a heating temperature T2 set in a range of Te1<T2<Te2 and for a heating time t set in a range of 90 min≦t≦180 min, wherein Te1 represents a eutectic transformation starting temperature, and Te2 represents a eutectic transformation finishing temperature.

Dependencies are inferred from the claim text.