孔隙性缺陷修复过程中材料扩散方式研究

孔隙性缺陷修复过程中, 由重结晶充满孔洞所需物质从基体材料中扩散而来, 材料的扩散能力对完成缺陷修复过程所需时间具有重要的影响。本文研究了孔隙性缺陷修复过程中材料扩散特性, 在不同温度条件下, 发现了至少存在着4种材料扩散方式, 其扩散能力相差较大。通过改变温度或加入其它物质, 扩散方式可以转变, 扩散速度能够得到控制, 这对于提高缺陷的修复能力, 有效消除大型锻件内部孔隙性缺陷具有重要作用。

Study of types of material diffusion in the processes of cavity-type fault recovery

The materials needful for filling the cavity through recrystallization are supplied by diffusion of matrix in the processes of cavity-type fault self-recovering, so the ability of materials diffusion has an important effect on the whole time of fault recovery. The study of diffusion characters of materials shows that four types of diffusion exist at least at different temperatures, which have much different velocities. By changing the temperature or adding the other material, the type of diffusion could be changed and the velocity of diffusion could be controlled, and it is very important to develop the ability of fault recovery and eliminate the voids in a heavy forging.