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通过固溶、热等静压+固溶处理对激光沉积制造(LDM)Ti4822合金进行组织结构调整和相比例控制,分析不同激光沉积制造后处理工艺对合金组织和性能的影响。结果表明,经固溶、热等静压+固溶处理两种处理后γ-TiAl合金组织均含有γ、α_2及微量B2相;1260℃热处理后γ-TiAl合金形成典型的双态组织;1330℃热处理后γ-TiAl合金形成近片层组织;1350℃热处理后γ-TiAl合金形成全片层组织;热等静压导致组织内的层片尺寸略有增大。随热处理温度的升高γ-TiAl合金显微硬度逐渐减小,在相同热处理温度下,经热等静压处理后的样品显微硬度提高约5%,热等静压导致合金组织致密度提升的强化效果要高于片层组织粗化引起的弱化效果。
The microstructures and properties of Ti4822 alloy by laser deposition (LDM) were studied by means of solution treatment, hot isostatic pressing and solution treatment. The effects of different laser deposition post-processing techniques on microstructure and properties were analyzed. The results show that the γ-TiAl alloy microstructure contains γ, α 2 and trace B2 phases after solution treatment, hot isostatic pressing and solution treatment. The γ-TiAl alloy forms typical binary microstructure after 1260 ℃ heat treatment. After heat treatment, the γ-TiAl alloy was formed into near-layer structure. After heat treatment at 1350 ℃, the γ-TiAl alloy formed a whole-layer structure. The hot isostatic pressing resulted in a slight increase of the layer size in the structure. With the increase of heat treatment temperature, the microhardness of γ-TiAl alloy gradually decreases. At the same heat treatment temperature, the microhardness of the sample after hot isostatic pressing increases about 5%, and the hot isostatic pressing leads to the increase of the density of the alloy structure The strengthening effect is higher than the weakening effect caused by the coarsening of the lamellar structure.