【标题】Additive manufacturing - innovation in sheet metal tooling production
【参考中译】增材制造-板材模具生产的创新
【类型】 期刊
【作者】 Colin Granger
【摘要】 Established in 1975 and based in Manchester, Concept Metal Products Ltd (www.conceptmetal.co.uk) uses a variety of processes - including shearing, bending, punching, and laser cutting - to fabricate sheet metal into custom shapes that meet customers' specific requirements. Recently, the company was looking to increase its ability to react faster to customers' needs and win more orders with quicker turnround times. Although the Concept Metal team was well-versed in CAD, they had virtually no experience with additive manufacturing (AM), although they reckoned that AM would not only shorten lead times for tool production and give them greater control but also the flexibility to create tools designed for specialist applications.
【参考中译】 Concept Metal Products Ltd（www.conceptmetal.co.uk）成立于1975年，总部位于曼彻斯特，采用多种工艺（包括剪切、弯曲、冲孔和激光切割）将金属板材制作成满足客户特定要求的定制形状。最近，该公司希望提高对客户需求做出更快反应的能力，并以更快的周转时间赢得更多订单。尽管Concept Metal团队精通CAD，但他们几乎没有增材制造（AM）的经验，尽管他们认为AM不仅会缩短工具生产的交货时间并赋予他们更大的控制权，而且还可以灵活地创建专为专业应用程序设计的工具。
【来源】 Machinery Market 2024
【入库时间】 2024/7/29
【标题】Additive manufacturing Ti-22Al-25 Nb alloy with excellent high temperature tensile properties by electron beam powder bed fusion
【参考中译】电子束粉床熔法增材制造具有优异高温拉伸性能的Ti-22 Al-25 Nb合金
【关键词】 Electron beam powder bed fusion; Laser beam powder bed fusion; Ti-22Al-25Nb; High-temperature mechanical property
【参考中译】 电子束粉床熔化;激光束粉床熔化; Ti-22 Al-25 nb;高温机械性能
【作者】 Qiang Chen; Lianyong Xu; Yankun Zhang; Lei Zhao; Kangda Hao; Wenjing Ren; Yongdian Han
【摘要】 Additive manufacturing of TiAl alloys remains challenging due to their poor high-temperature tensile properties. In this work, electron beam powder bed fusion (PBF-EB) was applied to fabricate Ti-22Al-25 Nb alloy with a high pre-heating temperature (830℃), achieving a breakthrough in improving the tensile properties of TiAl alloys by additive manufacturing. The microstructure and tensile properties of Ti-22Al-25 Nb fabricated by laser beam powder bed fusion (PBF-LB) and PBF-EB were investigated. Excellent tensile strength (803 MPa) at 650℃ was obtained by PBF-EB, which was attributable to the precipitation and growth of the O phase at a suitable preheating temperature. An in-depth microstructure analysis of the deformation and fracture mechanisms of the as-printed samples was performed via Scanning Electron Microscopy (SEM), Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM). The area fraction of the O phase in the PBF-EB sample was approximately 6 times higher than that of the PBF-LB sample. The PBF-EB sample exhibited transgranular fracture at 650℃, in contrast to the PBF-LB samples. The shape and quantity of the O phase and β phase played an important role in improving the tensile properties of the Ti-22Al-25 Nb alloys at high temperature.
【参考中译】 由于TiAl合金较差的高温拉伸性能，TiAl合金的添加剂制造仍然具有挑战性。本文采用电子束粉末床熔合技术制备了具有较高预热温度(830℃)的Ti-22Al-25Nb合金，实现了通过添加工艺改善TiAl合金拉伸性能的突破。研究了激光粉末床融合(PBF-LB)和PBF-EB制备的Ti-22Al-25Nb合金的组织和拉伸性能。由于在合适的预热温度下，O相的析出和长大，使材料在650℃时获得了优异的拉伸强度(803 Mpa)。利用扫描电子显微镜(SEM)、背向散射电子显微镜(EBSD)和透射电子显微镜(TEM)对印刷样品的变形和断裂机制进行了深入的微观分析。PBF-EB样品中O相的面积分数约为PBF-LB样品的6倍。在650℃处，PBF-EB样品表现为穿晶断裂，而PBF-LB样品则相反。O相和β相的形状和数量对改善Ti-22Al-25Nb合金的高温拉伸性能起着重要作用。
【来源】 Additive Manufacturing 2024, vol.86
【标题】Cryogenic tensile behavior of carbon-doped CoCrFeMnNi high-entropy alloys additively manufactured by laser powder bed fusion
【参考中译】激光粉床熔炼增材制备碳掺CoCrFeMnNi高熵合金的低温拉伸行为
【关键词】 High-entropy alloy; Laser powder bed fusion; Microstructure; Tensile behavior; Cryogenic temperature
【参考中译】 高密度合金;激光粉床熔化;显微组织;拉伸行为;低温
【作者】 Haeum Park; Hyeonseok Kwon; Kyung Tae Kim; Ji-Hun Yu; Jungho Choe; Hyokyung Sung; Hyoung Seop Kim; Jung Gi Kim; Jeong Min Park
【摘要】 Cryogenic tensile behaviors of carbon-doped CoCrFeMnNi high-entropy alloy (C-HEA) printed by laser powder bed fusion (LPBF) were systematically explored. The LPBFed C-HEA exhibits excellent cryogenic tensile properties with not only high yield strength but also largely extended elongation as compared to those under room temperature deformation. In particular, the elongation of the C-HEA is twice as high at 77 K compared to 298 K. The strain hardening rate of LPBFed C-HEA under cryogenic deformation is much higher than that under plastic deformation at the room temperature, which contributes to the dramatic enhancement of uniform elongation by delaying plastic instability. Because the flow stress of C-HEA is significantly increased by temperature decrease, it can exceed the critical twinning stress at the early-stage deformation at 77 K. Deformation twins and nanocarbides synergistically contribute to the high back stress evolution of the C-HEA under cryogenic tensile deformation. This study can provide a new perspective on developing high-performance alloys for use in additive manufacturing in cryogenic applications.
【参考中译】 系统研究了激光粉床熔化(LPBF)法制备的掺碳CoCrFeMnNi高熵合金(C-HEA)的低温拉伸行为。LPBFed C-HEA具有优良的低温拉伸性能，与室温变形相比，不仅具有高的屈服强度，而且延伸率也大大提高。与298K相比，77K时C-HEA的延伸率提高了一倍。低温变形下的应变硬化率远高于室温塑性变形下的应变硬化率，这有助于通过延缓塑性失稳来显著提高延伸率的均匀性。由于C-HEA的流动应力随着温度的降低而显著增加，在77K变形初期可超过临界孪生应力，变形孪晶和纳米碳化物协同作用有助于C-HEA在低温拉伸变形下的高背应力演化。这项研究为开发用于低温应用添加剂制造的高性能合金提供了一个新的视角。