再结晶晶界对合金钢锭Cr元素均匀化扩散的影响  

Effect of recrystallization grain boundary on homogenized diffusion of chromium in alloy steel ingot

作　　者：陈锟[1,2] 杨弋涛[1] 邵光杰[1] 刘克家[2] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]上海应用技术学院材料科学与工程学院,上海200235

出　　处：《材料热处理学报》2011年第5期79-83,共5页Transactions of Materials and Heat Treatment

基　　金：国家科技支撑计划课题(2007BAE51B04)

摘　　要：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 view of grain boundary diffusion,the fact that forging enhanced the diffusion of Cr in alloy steel ingot was experimentally verified and theoretically explained.By data obtained from coarse-grained and fine-grained Cr diffusion couple after homogenizing annealing,it is presented that fine-grained boundary enhances bulk diffusion of Cr.Based on grain refining effect of recrystallization through forging,it is deduced that recrystallization grain boundary enhances the diffusion of Cr.The measurement of Cr distribution in alloy steel ingot after forging and diffusion annealing shows that the diffusivity of Cr in the forged sample is higher than that in the counterpart without deformation,which is consistent with the results that grain boundary enhances the diffusion.Hence,the opinion that fine-grained boundary produced by forging and recrystallization may enhance the diffusion of Cr is verified.

关 键 词：均匀化退火 扩散 晶界 再结晶 铬 

分 类 号：TG111.6[金属学及工艺—物理冶金] TG156.2[金属学及工艺—金属学]