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


          

刊名：Additive Manufacturing
作者：Qiang Chen（School of Materials Science and Engineering, Tianjin University）
Lianyong Xu（School of Materials Science and Engineering, Tianjin University）
Yankun Zhang（School of Materials Science and Engineering, Tianjin University）
Lei Zhao（School of Materials Science and Engineering, Tianjin University）
Kangda Hao（School of Materials Science and Engineering, Tianjin University）
Wenjing Ren（School of Materials Science and Engineering, Tianjin University）
Yongdian Han（School of Materials Science and Engineering, Tianjin University）
刊号：780C0044
ISSN：2214-8604
出版年：2024
年卷期：2024, vol.86
页码：104236-1--104236-14
总页数：14
分类号：TH16
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
语种：eng
文摘：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。



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