渗铝钢扩散层生长动力学的计算机拟合  

Computer fitting of growth kinetics of diffusion layer in aluminized steel

作　　者：刘爱萍[1] 张伟[1] 

机构地区：[1]洛阳理工学院机电工程系,河南洛阳471023

出　　处：《金属热处理》2011年第8期124-127,共4页Heat Treatment of Metals

基　　金：河南省科技计划项目(0624250037);河南省自然科学基金项目(082300440020)

摘　　要：在20钢上分别制备了热浸镀纯铝和稀土铝层。通过不同温度的扩散处理后,测定了扩散层的稀土分布和扩散层厚度增量,考察了在不同温度下稀土对扩散层生长动力学的影响,并通过计算机拟合给出了扩散层生长动力学曲线。结果表明,热浸镀稀土铝钢在扩散处理时,稀土渗入了扩散层,且存在偏聚;稀土可增加扩散层厚度,在750、850℃作用较明显;扩散系数增加1.8-2.3倍,扩散激活能降低4500-7800 J.mol-1。The pure aluminized layer and RE-aluminized layer on 20 steel were prepared by hot dip aluminizing method,respectively.After diffusion treatment at different temperature,the distributions of rare earth elements in diffusion layer and the thickness increment of diffusion layer were measured,the effect of rare earths on the growth kinetics of diffusion layer at different temperature was investigated,and its growth kinetic curves were given with computer fitting.The results show that rare earth elements permeate diffusion layer and there is partial cluster.The RE permeating into steel can enhance the thickness of diffusion layer,the effects of RE are stronger at 750 ℃ and 850 ℃,the diffusion coefficient has been increased by a factor of 1.8～2.3 and the diffusion activation energy is decreased 4500～7800 J.mol-1 compared with pure aluminizing.

关 键 词：扩散处理 稀土 生长动力学 扩散系数 

分 类 号：TG174.443[金属学及工艺—金属表面处理]