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首页> 外文期刊>Journal of Materials Engineering and Performance >Tensile Properties and Microstructures of Laser-Formed Ti-6Al-4V
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Tensile Properties and Microstructures of Laser-Formed Ti-6Al-4V

机译：激光形成的Ti-6Al-4V的拉伸性能和显微组织

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摘要

The room temperature tensile properties of Ti-6Al-4V alloy prepared under two different processing routes were evaluated and compared. One group of samples was prepared by conventional casting-forging-rolling into flat plates. The other group was prepared by using Triton's Laser Free-Form Fabrication (LF3) processes, i.e., a laser was used to melt pre-alloyed powders of the required metallic composition as they were dropped onto a moveable substrate programmed to move in such a manner as to form a solid alloy plate. Five populations of Ti-6Al-4V were evaluated: a standard wrought form, an as-deposited form, a machined as-deposited form, a heat-treated as-deposited form, and a machined as-deposited and heat-treated form. The poorest mechanical properties occurred with the rough surfaces, likely due to existing microcracks and stress concentrations. The LF3 as-deposited material had mechanical properties comparable to, if not higher than, the mechanical properties of the wrought material. Further evaluations of the laser-formed material for complex spacecraft piece parts were warranted, specifically in regards to improving the surface finish of the materials.
机译：评价和比较了在两种不同的加工路线下制备的Ti-6Al-4V合金的室温拉伸性能。通过常规的铸锻轧成平板来制备一组样品。另一组是通过使用Triton的激光自由成形加工（LF3）工艺制备的，即，使用激光将所需金属成分的预合金粉末熔化后，将其滴落到以这种方式编程移动的可移动基材上以形成坚固的合金板。评价了五个Ti-6Al-4V种群：标准锻造形式，沉积形式，机加工沉积形式，热处理后沉积形式以及机加工后沉积和热处理形式。最差的机械性能发生在粗糙的表面上，这可能是由于现有的微裂纹和应力集中所致。 LF3沉积材料的机械性能与锻造材料的机械性能相当，甚至更高。必须对用于复杂航天器零件的激光成型材料进行进一步评估，尤其是在改善材料的表面光洁度方面。

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