双曝光激光增强超声辅助粉末床金属熔合的力学性能和各向同性

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Sebastian Platt , Jan Wegner , Arno Elspaß , Hanna Schönrath , Stefan Kleszczynski
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引用次数: 0

摘要

由于定向凝固,使用激光束工艺通过粉末床熔化金属生产的零件往往表现出机械各向异性,使零件设计复杂化。本研究探索利用超声辅助通过增加成核来促进微观结构均质化,从而降低各向异性。采用双曝光策略制备样品,以避免粉末床原位超声激励所带来的挑战。此外,还进行了全面的显微组织和力学分析。显微组织分析显示,超声处理后的样品晶粒取向变化增加。力学试验结果表明,抗拉强度和屈服强度各向异性得到改善,抗拉强度和屈服强度各向异性分别降低55.4%和46.1%。尽管表面粗糙度增加,但超声处理降低了延性相关性能的各向异性,突出了其通过减少各向异性同时提高机械性能来改善增材制造零件性能的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhancing mechanical properties and isotropy in ultrasonic assisted powder bed fusion of metals using a laser beam (PBF-LB/M) via Dual Exposure
Parts produced via powder bed fusion of metal using a laser beam process often exhibit mechanical anisotropy due to the directional solidification, complicating part design. This study explores the use of ultrasonic-assistance to reduce anisotropy by promoting microstructural homogenization through increased nucleation. Specimens were fabricated using a dual exposure strategy, to avoid the challenges that arise with the in-situ ultrasonic excitation of a powder bed. Furthermore, a comprehensive microstructural as well as mechanical analysis was carried out. Microstructural analysis revealed increased grain orientation variation in ultrasonically treated specimens. Mechanical testing showed improved tensile and yield strength and reduced anisotropy, with tensile and yield strength anisotropy decreasing by 55.4 % and 46.1 %, respectively. Despite increased surface roughness, ultrasonic treatment reduced anisotropy in ductility-related properties, highlighting its potential to improve the performance of additively manufactured parts by reducing anisotropy and simultaneously enhancing mechanical properties.
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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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