激光表面熔凝处理对U-2Nb合金抗腐蚀性能的影响  

Effects of Laser Surface Melting on Corrosion Resistance of U-2Nb Alloy

作　　者：李盛和[1] 谢志强[1] 张友寿[1] 王巍[1] 张彤燕[1] 

机构地区：[1]中国工程物理研究院,四川绵阳621900

出　　处：《稀有金属材料与工程》2007年第2期301-304,共4页Rare Metal Materials and Engineering

基　　金：中国工程物理研究院重大基金项目资助(2005Z0302)

摘　　要：利用波长1.06μm的激光对U-2Nb合金进行了表面熔化处理。结果表明:U-2Nb合金激光熔化层的显微硬度(HV)由处理前的2900MPa提高到3300MPa;合金基材为双相(α+γ)珠光体,经激光处理后变成马氏体(α′),激光处理能细化显微组织,使Nb元素实现均匀分布。阳极极化试验与质量法腐蚀试验表明:激光处理能明显提高合金的抗腐蚀能力,在FeCl3·6H2O溶液中激光处理后合金的失重仅为处理前的1/5。A 1.06 μm wavelength laser beam was used to melt the surface layer of U-2Nb alloy. The microstructure and corrosion resistance of surface melting U-2Nb alloy were investigated by TEM, X ray microprobe analysis, scanning electron microscope and weight loss tests. It is found that the melted layer is composed of metastable phase （α′） with microhardness of 330 Hr. The element distribution is very homogeneous in the melted layer. The surface observation and weight loss test reveal that the laser surface melting has a beneficial effect of improving the corrosion resistance of U-2Nb alloy.

关 键 词：U-2Nb合金 抗腐蚀性能 激光 快速凝固 

分 类 号：TG174[金属学及工艺—金属表面处理]