Current research activities involving the laser directed energy deposition (DED) of Ti-6Al-4V alloy focus on its microstructure and performance. This paper details an approach for fine-tuning the content of Al and V during DED Ti-6Al-4V and explores a heat treatment strategy to enhance mechanical properties. A Ti-6Al-4V feedstock powder was adapted to provide the basis of Ti-5.6Al-3.8V, Ti-5.3Al-3.6V, and Ti-5.0Al-3.4V alloys. The effect of alloy composition on tensile properties of DED these alloys were determined. It was confirmed that the tensile properties of DED Ti-5.6Al-3.8V and Ti-5.3Al-3.6V alloys exceeded those of forging standard of Ti-6Al-4V, while the tensile strength of DED Ti-5.0Al-3.4V was lower than the forging standard of Ti-6Al-4V due to coarsened α laths in the prior β grains. The changes to microstructure and tensile properties of DED Ti-5.6Al-3.8V and Ti-5.3Al-3.6V alloys after heat treatment were analyzed, and the results showed that the elongation of the DED Ti-5.3Al-3.6V after heat treatment was significantly improved, from 11.3%–17.2%, while its tensile strength slightly decreased 1.7 %. The results are expected to guide the fabrication of DED near Ti-6Al-4V alloy to produce products with high ductility at a minimal compromise in ultimate tensile strength.

目前涉及 Ti-6Al-4V 合金激光定向能量沉积 (DED) 的研究活动集中在其微观结构和性能上。本文详细介绍了在 DED Ti-6Al-4V 过程中微调 Al 和 V 含量的方法，并探索了一种提高机械性能的热处理策略。Ti-6Al-4V 原料粉末适用于提供 Ti-5.6Al-3.8V、Ti-5.3Al-3.6V 和 Ti-5.0Al-3.4V 合金的基础。确定了合金成分对 DED 这些合金的拉伸性能的影响。经证实，DED Ti-5.6Al-3.8V 和 Ti-5.3Al-3.6V 合金的拉伸性能超过 Ti-6Al-4V 的锻造标准，而 DED Ti-5.0Al-3.4V 的拉伸强度由于先前β晶粒中的α板条粗化，因此低于Ti-6Al-4V的锻造标准。分析了 DED Ti-5.6Al-3.8V 和 Ti-5.3Al-3.6V 合金热处理后组织和拉伸性能的变化，结果表明 DED Ti-5.3Al-3.6V 合金热处理后的伸长率处理得到显着改善，从 11.3% 到 17.2%，而其拉伸强度略有下降 1.7%。预计该结果将指导在 Ti-6Al-4V 合金附近制造 DED，以生产具有高延展性的产品，同时最大限度地降低极限抗拉强度。