利用选择性重扫描技术研究激光粉末床熔融部件中的穿透微观结构

IF 4.2 Q2 ENGINEERING, MANUFACTURING Additive manufacturing letters Pub Date : 2024-07-01 DOI:10.1016/j.addlet.2024.100221
Bharath Bhushan Ravichander , Shweta Hanmant Jagdale , Golden Kumar
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引用次数: 0

摘要

由于网状部件的后处理方法有限,因此原位微观结构控制是快速成型金属部件的理想选择。在这里,我们介绍了一种新型的选择性重扫描方法,用于控制激光粉末床熔融(LPBF)生产的金属零件的局部凝固条件和微观结构。我们的研究表明,熔池尺寸、晶粒大小和子晶胞结构可在三个维度上有选择性地变化,以设计 LPBF 零件的机械响应。基于晶格的重新扫描策略能够形成由细粒和粗粒组成的相互渗透的微观结构。局部加热和冷却引起的热应力提高了重新扫描试样的硬度和拉伸强度。这项研究表明,选择性重扫描策略是实现精确控制印制 LPBF 零件微观结构和性能的一种有效途径,无需后续加工。
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Interpenetrating microstructure in laser powder-bed fusion parts using selective rescanning

In-situ microstructural control is desirable in additively manufactured metal parts due to limited post-processing options for net-shaped components. Here, we introduce a novel selective rescanning approach to control the local solidification conditions and the microstructure in metal parts produced by laser powder-bed fusion (LPBF). We show that the melt pool dimensions, grain size, and sub-grain cell structure can be selectively varied in three dimensions to engineer the mechanical response of LPBF parts. The lattice-based rescanning strategy enables the formation of an interpenetrating microstructure comprised of fine and coarse grains. The localized heating and cooling-induced thermal stresses increase the hardness and tensile strength of rescanned specimens. The study shows the potential of selective rescanning strategy as a promising avenue for achieving precise control of microstructure and properties in as-printed LPBF parts without subsequent processing.

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来源期刊
Additive manufacturing letters
Additive manufacturing letters Materials Science (General), Industrial and Manufacturing Engineering, Mechanics of Materials
CiteScore
3.70
自引率
0.00%
发文量
0
审稿时长
37 days
期刊最新文献
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