Additive manufacturing of a novel Ti-Al-V-Fe alloy using selective laser melting

Ti-1Al-8V-5Fe (Ti-185) and other Fe containing beta-Ti alloys are attractive because of their high strength and low cost. These alloys, however, cannot be produced through ingot casting due to strong Fe segregation and the formation of beta flecks. Selective Laser Melting (SLM) was successfully used to produce Ti-185 components starting from elemental Ti and Fe powders, and an Al-V master alloy powder with irregular shape. Microstructure analysis of the as-built components demonstrated that SLM can be used to produce a very fine grain microstructure with nano-scale precipitates and non-detrimental Fe segregation. The findings are interpreted in terms of the rapid solidification conditions during SLM. Compression test results reveal that ultra-high strength and reasonable ductility can be achieved in the as-built as well as heat treated samples.

Ti - 1Al - 8V - 5Fe（Ti - 185）以及其他含铁的β - 钛合金因其高强度和低成本而具有吸引力。然而，由于铁的严重偏析以及β斑的形成，这些合金无法通过铸锭法生产。选区激光熔化（SLM）技术被成功用于从元素钛粉和铁粉以及不规则形状的Al - V中间合金粉末开始制备Ti - 185部件。对所制造部件的微观结构分析表明，SLM可用于制造具有纳米级析出物且铁偏析无害的非常细小的晶粒微观结构。这些发现是根据SLM过程中的快速凝固条件来解释的。压缩试验结果显示，在制造态以及热处理后的样品中都能实现超高强度和合理的延展性。