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中文摘要：
运用激光熔化沉积快速成形技术制备了600℃高温钛合金Ti60棒状及板状试样,分析了其凝固组织及稀土复合物的析出行为。结果表明,激光连续熔化沉积Ti60棒状试样由以棒材轴心呈微＂八＂字形对称分布的定向生长柱状晶构成,柱状晶内部为近乎无侧向分枝的胞状晶组织,且在胞壁上存在细小均匀分布的稀土复合物;而激光逐层熔化沉积多道搭接板状试样具有更为细小的完全无侧向分枝＂之＂字形交替生长超细胞晶快速定向凝固组织,其超细胞晶间距仅为5～9μm,且晶内稀土复合物较棒材更加细小密集。
英文摘要：
Bar and plate-like samples of high-temperature titanium alloy Ti60 were produced by laser melting deposition manufacturing process. Rapidly solidified microstructure and precipitation behavior of rare earth-rich phases in the laser melting deposited Ti60 alloy were studied. The microstructure of the Ti60 bar sample is composed of directionally solidified ＂splayed＂ columnar grains with bar specimen＇s axes as its symmetry axes. The inner of the columnar grains has fine and uniform directional rapidly solidified full cellular structure, with extremely fine rare earth-rich phases distributed along the sub-grain boundaries. The laser multiple-track-overlap layer-by-layer melting deposited Ti60 plate-like specimen has uniform and ultra-fine directional rapidly solidified full cellular structure formed in ＂zig-zag＂ alternate growth, with a cell spacing as low as 5-9μm. The rare earth-rich phases in the plate-like specimen are much finer and denser than that of bar-like sample.
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