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从晶界扩散的角度对含Cr钢锭锻后扩散加快的现象进行了实验验证和理论解释。首先由粗、细两种晶粒的Cr元素扩散偶的均匀化退火数据,得到细晶晶界加快了Cr元素的体扩散。基于锻造变形再结晶细化晶粒的作用,推断锻后再结晶晶界对Cr原子的扩散具有加速作用。在此基础上,对锻后扩散退火的钢锭中Cr元素的分布进行了测定,得出锻后Cr元素的扩散系数大于锻前。此与晶界加快扩散的结果相一致,证明了锻后细晶加速了Cr原子的扩散。
From the perspective of grain boundary diffusion, the phenomenon of accelerated diffusion after ingot forging with Cr steel was experimentally verified and theoretically explained. First, the coarse and fine grain Cr alloy diffusion even dual annealing data to get fine grain boundaries to accelerate the Cr element body diffusion. Based on the effect of recrystallization and grain refinement on forging deformation, it is inferred that the recrystallized grain boundary has an accelerating effect on the diffusion of Cr atoms. On this basis, the distribution of Cr element in ingot after forging diffusion annealing was measured, and the diffusion coefficient of Cr element after forging was larger than that before forging. This is consistent with the accelerated diffusion of grain boundaries, demonstrating that the fine grain accelerates the diffusion of Cr atoms after forging.