RE对耐候钢溶质再分配的影响  

Effects of RE on Solute Redistribution of Weather-Resisting Steel

作　　者：郭宏海[1] 宋波[1] 侯立松 毛璟红[3] 赵沛 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]五矿有色金属股份有限公司,北京100044 [3]北京科技大学材料科学与工程学院,北京100083 [4]中国钢研科技集团有限公司,北京100081

出　　处：《中国稀土学报》2010年第3期360-365,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家"973"计划资助项目(2004CB619107)

摘　　要：为研究RE对耐候钢中各元素偏析的影响,进行了不同RE含量的耐候钢定向凝固实验,拉速为15μm.s-1,观察了RE对耐候钢定向凝固试样糊状区的影响,并用电子探针定量分析了耐候钢中各元素的溶质分配系数。结果表明,钢中加入RE可以抑制枝晶生长,细化枝晶,有利于二次枝晶的生长,可以促进等轴晶的生成。RE原子在晶界的富集可以抑制溶质元素在固液界面的析出,提高各元素的非平衡溶质分配系数,可以有效减轻耐候钢的宏观偏析。The direction solidification experiment of different RE contents in weather-resisting steel was carried out,and aimed to study the effect of RE on macrosegregation of weather-resisting steel.The pulling rate was set to 15 μm·s-1 in the course of the experiment.The effect of RE on pasty area of direction solidification sample of weather-resisting steel was observed and non-equilibrium solute distribution coefficient of different elements in weather-resisting steel was analyzed quantitatively with detecting probe.The results indicated that the mixing of RE into the steel might inhibit the growth of treelike crystal and get the result of thinning the treelike crystal,thereby in favor of the growth of secondary treelike crystal,and furthermore,it might promote the growth of equiaxed crystal.The enrichment of RE atom at grain boundary might inhibit the precipitation from solid liquid interface of solute element,increase non-equilibrium solute distribution coefficient of various elements and reduce the macrosegregation of elements in steel.

关 键 词：耐候钢 分配系数 定向凝固 稀土 

分 类 号：TG142.7[一般工业技术—材料科学与工程]