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首页> 外文期刊>Journal of Materials Engineering and Performance >Laser 3D Printing of Fe-Based Bulk Metallic Glass: Microstructure Evolution and Crack Propagation
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Laser 3D Printing of Fe-Based Bulk Metallic Glass: Microstructure Evolution and Crack Propagation

机译：Fe系散装金属玻璃的激光3D印刷：微观结构演化和裂纹繁殖

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摘要

This work presents a comprehensive study of microstructure evolution, crack development and hardness performance of Fe-based bulk metallic glass parts processed by laser 3D printing. The combination of a low scan speed and high energy density generates a low temperature gradient, leading to supercooling and the formation of coarse dendrite and cellular crystal microstructure. Columnar dendrites grow in a single direction with large stress, and cracks are easily formed between the dendrites. The stress intensity factor (SIF) caused by the crack surface tension is small, the crack healing effect is weak, and it is difficult to prevent crack propagation. Cellular grain growth is uniform and more easily accommodates the strain, preventing crack initiation and propagation. In contrast, use of a high scan speed with low energy input produces a fine and uniform dendrite or even nanocrystalline, microstructure with microcracks. The SIF caused by the crack surface tension is large, and the crack healing effect is strong and prevents crack initiation and propagation. For low energy density, the hardness of the sample is similar to the hardness of the cast amorphous. This result indicates that the printing sample retained some amorphous characteristics.
机译：这项工作介绍了激光3D印刷加工Fe系散装金属玻璃零件的微观结构演化，裂纹开发和硬度性能的综合研究。低扫描速度和高能量密度的组合产生低温梯度，导致过冷却和粗枝晶和细胞晶体微观结构的形成。柱状枝晶在单一方向上生长，具有大应力，并且在树枝状内部容易形成裂缝。由裂纹表面张力引起的应力强度因子（SIF）小，裂纹愈合效果较弱，难以防止裂纹繁殖。细胞晶粒生长是均匀的，并且更容易容纳应变，防止裂纹引发和繁殖。相反，使用具有低能量输入的高扫描速度产生精细和均匀的树突甚至纳米晶，具有微裂纹的微观结构。由裂纹表面张力引起的SIF大，裂纹愈合效果强并防止裂纹启动和繁殖。对于低能量密度，样品的硬度类似于铸造无定形的硬度。该结果表明印刷样品保留了一些无定形特征。

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