Achieving homogeneity in a high-Fe ß-Ti alloy laser-printed from blended elemental powders
Achieving homogeneity in a high-Fe ß-Ti alloy laser-printed from blended elemental powders
复制标题
利用混合元素粉末激光打印高铁钛合金，实现均匀性
DOI：
10.1016/j.matdes.2021.110072
复制
发表时间：
2021
影响因子：
8.4
通讯作者：
Ahmed F
中科院分区：
文献类型：
--
作者：
Ahmed F
混合元素粉末是金属增材制造中预合金粉末的新兴替代品，因为它们可生产更广泛的合金，并且不开发新原料可节省成本。在这项研究中，在SLM过程中，原位合金化和并发的微观结构演变进行了研究，通过SLM上的BE Ti-185粉末，同时跟踪表面温度，通过红外成像和相变，通过同步辐射X射线衍射。然后，我们进行了死后电子显微镜（背散射电子成像，能量色散X射线光谱和电子背散射衍射），以进一步了解微观结构的发展。我们表明，虽然放热混合艾滋病的熔化过程中，激光熔化的结果只在合金和未混合区域的混合物。只有通过在热影响区进行进一步的热循环，才能实现完全合金化，从而获得一致的微观结构。
Blended Elemental powders are an emerging alternative to pre-alloyed powders in metal additive manufacturing due to the wider range of alloys producible with them and the cost savings from not developing novel feedstock. In this study,in situalloying and concurrent microstructure evolution during SLM are investigated by performing SLM on a BE Ti-185 powder while tracking the surface temperatures via Infra-red imaging and phase transforma- tion via synchrotron X-ray Diffraction. We then performed post-mortem electron microscopy (Backscatter Electron imaging, Energy Dispersive X-ray Spectroscopy and Electron Backscatter Diffraction) to further gain insight into microstructure development. We show that although exothermic mixing aids the melting process, laser melting results only in a mixture of alloyed and unmixed regions. Full alloying and thus a consistent microstructure is only achieved through further thermal cycling in the heat-affected zone.