【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。更多还原

【Abstract】 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 Hv.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.更多还原