Additive manufacturing of Ti-6Al-4V alloy by micro-laser metal wire deposition with pulsed wave emission: processability and microstructure formation

等轴晶 针状的 材料科学 微观结构 成核 沉积(地质) 冶金 粒度 合金 脉冲激光沉积 复合材料 压痕硬度 薄膜 纳米技术 古生物学 有机化学 化学 生物 沉积物
作者
Yunlong Fu,Ali Gökhan Demir,Ning Guo
出处
期刊:The International Journal of Advanced Manufacturing Technology [Springer Science+Business Media]
卷期号:126 (5-6): 2693-2711 被引量:9
标识
DOI:10.1007/s00170-023-11238-y
摘要

Abstract In this work, the micro-laser metal wire deposition (μLMWD) with ms-pulsed wave emission and low duty cycles was utilized to build the Ti-6Al-4V thin walls. The work first investigated the influence of the process parameters on single track stability and geometry. With the developed processing conditions thin walls with multiple layers were produced. The μLMWD produced thin walls were characterized by fine grain size expected to be due to the columnar to equiaxed transition (CET) in the produced wall. Fine columnar grains formed in the bottom region of wall due to the restriction of melt pool size and large cooling speed, while equiaxed grain formation and further refinement were achieved in the middle region, attributed to the intermittent stirring force that broke dendritic arms and increased nucleation events before solid–liquid interface. From the bottom to top region microstructures transferred from acicular α′ to short α lamella constituting basketweave structure, and the periodic heating and cooling generating by pulsed laser reduced the acicular α′ at higher cooling rate and decreased α size. The forming of equiaxed grain and fine grain and microstructure increased the wall microhardness.
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