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The effect of oxygen pickup during selective laser melting on the microstructure and mechanical properties of Ti–6Al–4V lattices

机译：选择性激光熔化过程中吸氧对Ti-6Al-4V晶格的组织和力学性能的影响

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摘要

Additive manufacturing techniques such as Selective Laser Melting (SLM) can produce complex shapes with relatively thin sections and fine detail. However, common materials for the process, such as Ti–6Al–4V, have microstructure and properties that are sensitive to the pickup of interstitial impurities, such as oxygen, which the material will be exposed to during the process. This problem would be especially severe for parts with thin sections, where surface effects can be more significant, and where poor properties may coincide with locally-elevated stress. Here we explore the effects of oxygen level in thin sections with the use of lattice materials (materials which can be considered to consist exclusively of near-surface material). Oxygen levels are artificially raised using repeated melting passes to result in more pickup, leading to significantly reduced ductility and hence reduced strength measured in compression. A ductile to brittle transition in strut failure mechanism is found with increasing number of melting passes, with significant modification in chemistry and crystallographic structure, despite the presence of a similar fine plate-like microstructure throughout.
机译：诸如选择性激光熔化（SLM）之类的增材制造技术可以产生具有相对薄的截面和精细细节的复杂形状。但是，用于该工艺的普通材料（例如Ti-6Al-4V）具有微结构和特性，这些材料对间隙杂质（例如氧气）的吸收很敏感，这些杂质会在工艺过程中暴露于其中。对于具有薄截面的零件，此问题将尤其严重，在这些零件中，表面影响可能会更显着，而较差的性能可能与局部升高的应力相吻合。在这里，我们使用晶格材料（可以认为仅由近表面材料组成的材料）探索薄段中氧含量的影响。使用重复的熔化过程可人工提高氧气含量，从而导致更多的皮脂吸收，从而导致延展性大大降低，从而降低了压缩强度。尽管整个过程中都存在类似的细板状微结构，但随着熔道次数的增加，发现了钢坯断裂机理中的韧性到脆性转变，并且化学和晶体结构发生了显着变化。

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