稀土元素对45钢固体渗硼的催渗作用  

Catalysis Effects of Rare Earth Elements on Powder Boriding of 45 Steel

作　　者：童锡勇 李凤华[2] 李长业[2] 樊占国[2] 

机构地区：[1]新疆自治区乌鲁木齐市中钢设备公司,新疆乌鲁木齐830022 [2]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《金属热处理》2007年第4期43-46,共4页Heat Treatment of Metals

基　　金：国家"十五"863攻关项目(2003AA305620)

摘　　要：对45钢进行了单元渗硼与硼稀土共渗，观察了渗硼层的组织、厚度，测试了各渗硼样品显微硬度、耐磨性和耐蚀性等性能。结果表明，加入稀土元素以后，渗硼层基本为单相的Fe2B，硼针变长，取向明显。在950℃×5h渗硼条件下，稀土氧化物质量分数在8％～9％时，渗层厚度最大。质量分数为9％稀土．硼共渗可以提高硼原子的渗入深度约1．5倍。与单元渗硼样品相比，硼稀土共渗样品具有较高的硬度、耐磨性能和耐酸、碱、盐腐蚀性能。The microstructure, thickness, microhardness, wear resistance and corrosion resistance of single-borided and RE-borided layers of 45 steel were investigated respectively. The results show that the RE-borided layer of the steel is single phase Fe2B with well-orientated longer boron needle. Under the condition of boriding at 950℃ for 5 h, the optimal mass fraction of rare earth elements to the thickest borided layer is 8% - 9%. The 9% RE-borided layer is about 2. 5 times thickness as the single-borided layer. Compared with single-borided layer, the RE-borided layer possess higher hardness, better wear resistance and corrosion resistance in acid, alkali and salt solutions, respectively.

关 键 词：稀土 固体渗硼 渗硼层 性能 

分 类 号：TG156.8[金属学及工艺—热处理]