稀土镝对钨钼合金渗层的影响  

Effect of Dy element on W-Mo co-diffusion alloyed layer

作　　者：张维[1] 高原[1] 袁琳[1] 王成磊[1] 陈桂文[1] 李宗基[1] 

机构地区：[1]桂林电子科技大学材料与工程学院,广西桂林541004

出　　处：《金属热处理》2012年第5期111-114,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(50764002);信息材料广西重点实验室主任研究课题(桂科能0710908-06-Z);广西区自然科学基金重点项目(2010GXNSFD013008)

摘　　要：利用等离子表面冶金技术对20钢进行W-Mo-Dy和W-Mo共渗。对合金渗层的硬度、金相组织、截面形貌、合金元素的分布和相结构进行检测和观察。结果表明:W-Mo-Dy共渗和W-Mo共渗合金渗层的表面硬度分别为347 HV0.05、294 HV0.05,合金层厚度分别为128μm、107μm,合金渗层与基体之间均存在反应扩散线,W-Mo-Dy共渗合金渗层组织较W-Mo共渗合金层组织晶粒细小,W-Mo-Dy共渗合金层基本相结构由(W、Mo、Dy)在Fe中固溶体、Dy2O3和少量的DyFe10Mo2组成;W-Mo共渗合金层共渗层基本结构为(W、Mo)在Fe中固溶体组成。W-Mo-Dy共渗合金层表面的[W]当量为24.79%,W-Mo共渗合金层表面[W]当量为18.4%;稀土镝具有明显的促渗、改善合金渗层组织的作用。W-Mo-Dy and W-Mo co-diffusion alloying were carried out on the 20 steel by plasma surface metallurgy technology. The hardness, microstructure, cross-section morphology, distribution of alloy element and phase structure of the alloyed layers were tested and observed by microhardness meter, SEM and XRD. The results showed that the hardness of the W-Mo-Dy alloyed layer and the W-Mo alloyed layer are 347 HV0.05 and 294 HV0.05 ,the alloyed layer thickness are 128 I.Lm and 108 p^m, respectively. There is a reaction-diffusion line between the diffusion layer and the substrate. Compared with W-Mo co-diffusion alloyed layer, the grain size of the W-Mo-Dy co-diffusion alloyed layer is finer. The basic phase composition of W-Mo-Dy co-diffusion alloyed layer are solid solution of （W, Mo, Dy） in Fe, Dy203 and a small quantity of DyFel0Mo2, and that of the W-Mo co-diffusion alloyed layer is solid solution of （ W, Mo） in Fe. The equivalent [ W] on surface of the alloyed layers reaches to 24.79% and 18.4%, respectively. Rare earth element （Dy） can significantly enhance the codiffusion alloying and improve the microstructure of the alloyed layer.

关 键 词：等离子表面冶金 钨钼镝共渗 合金渗层 稀土镝 

分 类 号：TG156.8[金属学及工艺—热处理]