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首页> 外文期刊>Materials Science and Engineering >Effect of heat treatment on the microstructure and mechanical properties of Ti6Al4V gradient structures manufactured by selective laser melting
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Effect of heat treatment on the microstructure and mechanical properties of Ti6Al4V gradient structures manufactured by selective laser melting

机译：热处理对选择性激光熔炼Ti6Al4V梯度组织的微观结构和力学性能的影响

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摘要

In this research, a body-center-cubic (BCC) gradient porous structure has been designed. Selective laser melting (SLM) was used to fabricate the Ti6Al4V BCC gradient porous structures. The effects of different heat treatments on the microstructure and mechanical properties were investigated by X-ray diffraction, scanning electron microscopy and compression tests. The microstructure morphologies show that α laths became coarser and amount of nano-sized β particles decreased after higher temperature solution heat treatment. The fracture morphologies show that fracture mechanism of Ti6Al4V gradient porous structure changed from brittle fracture to ductile fracture after heat treatment at 800 °C for 120 min and furnace cooling (SLM800FC). The energy absorption mode can be optimized by solution heat treatment and the energy absorption at ε = 50% of SLM800FC is 76.40 ± 12.65 MJ/m3, which is the highest value among the five group. These findings suggest that the gradient structure and specific heat treatment can improve the stability and predictability of Ti6Al4V porous structure.
机译：在这项研究中，设计了一个体心立方（BCC）梯度多孔结构。选择性激光熔化（SLM）用于制造Ti6Al4V BCC梯度多孔结构。通过X射线衍射，扫描电子显微镜和压缩试验研究了不同热处理对显微组织和力学性能的影响。显微组织形态表明，高温固溶热处理后，α板条变粗，β型纳米颗粒减少。断口形貌表明，在800 C热处理120 min和炉冷（SLM800FC）后，Ti6Al4V梯度多孔结构的断裂机理从脆性断裂变为延性断裂。通过固溶热处理可以优化能量吸收模式，SLM800FC的ε= 50％时的能量吸收为76.40±12.65 MJ / m3，是五组中最高的。这些发现表明，梯度结构和特定的热处理可以改善Ti6Al4V多孔结构的稳定性和可预测性。

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