In this work, a near-beta Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy was fabricated by selective laser melting (SLM), and the microstructure evolution together with the mechanical properties was studied. The as-fabricated alloy showed columnar β grains spreading over multiple layers and paralleling to the building direction. The distinct microstructure of as-fabricated alloy was composed of near-β (more than 98.1 %) with a submicron cellular structure. Different SLM processing parameters such as hatch spacing could affect the microstructure of as-fabricated alloy, which could thus further significantly affect the mechanical properties of as-fabricated alloy. In addition, the as-fabricated alloy with the distinct microstructure exhibits yield strength of 818 MPa combined with elongation of more than 19 %, which shows that SLM is a potential technology for manufacturing near-beta titanium components.

在这项工作中，通过选择性激光熔化 (SLM) 制备了一种近β Ti-5Al-5Mo-5V-1Cr-1Fe 钛合金，并研究了显微组织演变和机械性能。制造的合金显示柱状β晶粒分布在多个层上并平行于构建方向。制造合金的独特显微组织由近β（超过 98.1%）具有亚微米蜂窝结构。不同的 SLM 加工参数如舱口间距会影响制造合金的微观结构，从而进一步显着影响制造合金的机械性能。此外，具有独特微观结构的制造合金表现出 818 MPa 的屈服强度和超过 19% 的延伸率，这表明 SLM 是制造近β钛部件的潜在技术。