Abstract: Cu precipitated in feirite of 0.06C-0.40Cu bainite steel is kept with matrix in semi-coherent Kurdjumov-sachs relation, according to the theory of mismatch dislocation, with increasing temperature the calculated specific interfacial energy between ε-Cu and ferrite matrix increases, the coefficient of diffusion of Cu at 823 K is 1 000 times more than that at 723 K, and the ripening rate of ε-Cu increases approximately by 10 times. As ε-Cu precipitated size is 4.5 nm, ripening rate at 520 °C is 0.3127 nm-1/3, the ε-Cu particle size is 9.92 nm, yield strength of steel increases by 142.8 MPa.

Key words: Ferrite, ε-Cu, Specific Interfacial Energy, Ripening Rate

摘要： 0.06C-0.40Cu贝氏体钢铁素体中析出ε-Cu与基体保持Kurdjumov-sachs半共格关系,错配位错理论计算出ε-Cu与基体的比界面能随温度升高而增大,Cu在823 K的扩散速率比在723 K大1 000倍,ε=Cu熟化速率提高10倍左右。当ε-Cu析出尺寸为4.5 nm,520℃熟化速率0.312 7 nm^-1/3,得出ε-Cu颗粒尺寸为9.92 nm,钢的屈服强度提高142.8 MPa。

关键词: 铁素体, ε-Cu, 比界面能, 熟化速率