Article
Chemistry, Physical
K. Pandian, M. Neikter, F. Bahbou, A. Ganvir, T. Hansson, R. Pederson
Summary: Ti-6Al-4V, a high specific strength titanium alloy, is widely used in fan and compressor modules of gas turbine engines. The fatigue life of Ti-6Al-4V components manufactured using electron beam powder bed fusion (PBF-EB) process is improved by hot isostatic pressing (HIP) treatment. A low-temperature HIP treatment is performed at about 800°C to limit the impact on static mechanical properties. This study evaluates the fatigue behavior of such a modified HIP-treated material and compares it with the standard HIP-treated material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Amal Shaji Karapuzha, Darren Fraser, Yuman Zhu, Xinhua Wu, Aijun Huang
Summary: This study delves into the impact of post-fabrication Solution Heat Treatment (SHT) and Hot Isostatic Pressing (HIP) on Hastelloy X parts, revealing that post-fabrication HIP treatment significantly reduces porosity content while SHT shows no noticeable difference compared to as-built parts. Furthermore, there is no evidence of recrystallization occurring after post-fabrication treatments, with the original columnar grain structure being preserved.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Ju Wang, Dengzhi Yao, Meng Li, Xizhong An, Shujun Li, Wentao Hou, Xing Zhang, Guangyu Yang, Jian Wang, Lin Wang
Summary: In this study, the PBF-EB additive manufacturing of pure tungsten component is numerically reproduced using a validated DEM-CFD model. The effects of different process parameters on the characteristics of the powder bed are comprehensively analyzed, revealing the correlation between the stable state of powder layer accumulation and the packing density, surface roughness, and deposited layer height. The study also uncovers the different motion behaviors and forces experienced by particles located at the top and bottom regions of a new powder layer.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Zehao Qin, Nan Kang, Huajing Zong, Chunhui Zhan, Yanbo Fang, Zihong Wang, Mohamed El Mansori, Jing Chen, Xin Lin, Weidong Huang
Summary: This study applies hot isostatic pressing (HIP) to enhance the fatigue properties of L-PBFed alloys by healing porosities and promoting oxidation, highlighting the critical role of oxides in fatigue performance.
MATERIALS RESEARCH LETTERS
(2022)
Article
Engineering, Manufacturing
Christopher Arnold, Carolin Koerner
Summary: The study demonstrates the potential of in-situ acquisition of electron optical images for measuring thermal expansion, monitoring thermal shrinkage, and quantifying thermal strain with remarkable accuracy. This opens up new applications for in-situ electron-optical observation in temperature management and validation of numerical frameworks.
ADDITIVE MANUFACTURING
(2021)
Review
Chemistry, Physical
Zhuo-Jun Hou, Qing Wang, Chen-Guang Zhao, Jun Zheng, Ju-Mei Tian, Xiao-Hong Ge, Yuan-Gang Liu
Summary: This paper presents the current status and future trends of online monitoring technology for the metal powder bed fusion (PBF) process. By combining powder recoating monitoring, powder bed inspection, building process monitoring, and melt layer detection, the quality and reliability of PBF parts can be improved.
Article
Engineering, Manufacturing
T. P. Moran, D. H. Warner, A. Soltani-Tehrani, N. Shamsaei, N. Phan
Summary: The study examined the relationship between build defects and their position on the build plate in Ti-6Al-4V specimens fabricated on two common commercial laser powder bed fusion systems, revealing substantial spatial heterogeneity of the defect population. The impact of such variability on fatigue performance was considered, with investigations into asymmetries inherent to LPBF fabrication as potential sources of the spatial heterogeneity, explained by shielding gas flow simulations.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Chemical
Yufan Zhao, Kenta Aoyagi, Yujie Cui, Kenta Yamanaka, Akihiko Chiba
Summary: The quality of powder bed fusion (PBF) products is influenced by processing conditions and materials, with powder characteristics playing a significant role in determining packing features and affecting heat transfer processes. This study focused on the influence of powder characteristics on upper surface quality and solidification grain structure in PBF with electron beam (PBF-EB) using two types of CoCrMo alloy powders with different thermal conductivities. The results showed that powder with high thermal conductivity alleviated overheating under high-power conditions and improved fusion sufficiency under low-power conditions.
Article
Metallurgy & Metallurgical Engineering
Wei Liu, Yan Wang, Li-xiong Han, Ying-kang Wei, Hui-ping Tang, Shi-feng Liu
Summary: The oxygen content in metal powder plays a decisive role in its recyclability. Research on the impact of oxygen content on powder properties and material formability is of practical significance in achieving economical production with additive manufacturing and preventing resource waste. By deliberately oxidizing the powder at high temperature, the oxygen content in the powder was increased, and a calculation method for the oxygen content in the powder oxidation film was provided. It was found that the majority of oxygen was present in the oxide particles in the powder and the oxide film on the powder surface, which affected the flowability of the powder.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Yu Guo, Chao Chen, Weiwei He, Yuankui Cao, Hongtao Xing, Hang Fang, Chen Wu, Kechao Zhou
Summary: In this study, graded tantalum scaffolds were produced using electron beam powder bed fusion (EB-PBF) and subjected to compression-compression fatigue testing. The compressive fatigue behavior and strength of graded tantalum scaffolds with vertical gradient (VG) and parallel gradient (PG) states were investigated. The failure of the PG graded scaffold occurred mainly in its lowest strength constituent, leading to increased cyclic ratcheting strain and fatigue damage strain. On the other hand, the VG graded scaffold exhibited small strain accumulation in a single cycle due to the simultaneous uniform deformation of each structure, resulting in low cyclic ratcheting strain. Additionally, stress redistribution in the pore structure with higher strength hindered the propagation of fatigue cracks, resulting in low fatigue damage strain. Therefore, the design concept of graded pore structure under identical strain condition is beneficial for obtaining porous tantalum scaffold with high compressive fatigue strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yufan Zhao, Kenta Aoyagi, Kenta Yamanaka, Akihiko Chiba
Summary: This study investigated the effect of powder layer thickness on the electron beam powder bed fusion process. The results showed that a relatively larger powder layer thickness can expand the processing window but also decrease the melting efficiency and result in surface height differences. Numerical simulation further confirmed the dependency of the layer thickness effect on the processing conditions.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Anton du Plessis, Nima Razavi, Di Wan, Filippo Berto, Adam Imaddadulah, Chad Beamer, James Shipley, Eric MacDonald
Summary: Additive manufacturing of metal components is widely used in high performance applications, particularly in the aerospace industry. Laser powder bed fusion is the most commonly used process, but it has some challenges. Hot isostatic pressing has emerged as a key technology for post-processing metal components and improving fatigue properties.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Mechanical
Hongzhuang Zhang, Changyou Li, Guo Yao, Yimin Zhang
Summary: This paper comprehensively investigated the material characteristics, mechanical properties, and deformation behaviors of LPBF 304L austenitic stainless steel subjected to HIP process with different temperatures. The experimental results showed that increasing HIP temperature led to increased grain size, inclusion size, recrystallization fraction, and dimple size, resulting in homogenized microstructure, reduced yield strength and microhardness, and significantly improved ductility. Furthermore, the study revealed the influence of porosity, inclusion, residual stress, and dislocation density on the fatigue life of HIP-treated samples after surface post-treatment.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Review
Engineering, Manufacturing
Salome Sanchez, Peter Smith, Zhengkai Xu, Gabriele Gaspard, Christopher J. Hyde, Wessel W. Wits, Ian A. Ashcroft, Hao Chen, Adam T. Clare
Summary: Powder Bed Fusion (PBF) techniques offer high design flexibility and are attractive for manufacturing high-performance materials like nickel-based superalloys. A comprehensive review of the mechanical properties of PBF nickel-based superalloys, including their microstructure and process parameters, is provided in this paper to aid practitioners in identifying research opportunities. The study concludes with summaries of data on mechanical properties and discussions on process factors influencing functional performance.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2021)
Article
Metallurgy & Metallurgical Engineering
Siyuan Qin, Simone Herzog, Anke Kaletsch, Christoph Broeckmann
Summary: Laser additive manufacturing allows for the efficient production of complex parts, but the presence of pores and carbide networks in the laser powder-bed fusion (LPBF) process can reduce fatigue strength. Hot isostatic pressing (HIP) with integrated heat treatment effectively densifies the material and alters its microstructure, leading to improved fatigue strength. Research findings demonstrate that the HIP process significantly enhances the fatigue strength of the samples.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Nimrod Yavo, Ori Yeheskel, Ellen Wachtel, David Ehre, Anatoly I. Frenkel, Igor Lubomirsky
Article
Materials Science, Ceramics
Nimrod Yavo, Geetu Sharma, Giora Kimmel, Igor Lubomirsky, Alexandra Navrotsky, Ori Yeheskel
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2018)
Article
Materials Science, Ceramics
Nimrod Yavo, Asaf Nissenbaum, Ellen Wachtel, Tal-El Shaul, Orit Mendelson, Giora Kimmel, Sangtae Kim, Igor Lubomirsky, Ori Yeheskel
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2018)
Article
Materials Science, Multidisciplinary
S. C. Vogel, S. Takajo, M. A. Kumar, E. N. Caspi, A. Pesach, E. Tiferet, O. Yeheskel
Article
Materials Science, Multidisciplinary
Einat Strumza, Shmuel Hayun, Shmuel Barzilai, Yacov Finkelstein, Roey Ben David, Ori Yeheskel
JOURNAL OF MATERIALS SCIENCE
(2019)
Article
Engineering, Manufacturing
Einat Strumza, Ori Yeheskel, Shmuel Hayun
ADDITIVE MANUFACTURING
(2019)
Article
Materials Science, Multidisciplinary
Silvie Maskova-Cerna, Alexandre Kolomiets, Jiri Prchal, Itzhak Halevy, Volodymyr Buturlim, Mark Nikolaevsky, Oleksandra Koloskova, Primoz Kozelj, Markus Koenig, Martin Divis, Leonid M. Sandratskii, Jiri Kastil, Alexander Andreev, Eteri Svanidze, Ladislav Havela
Summary: The resistivity study of U2Ni2Sn single crystal under both ambient and high pressure conditions revealed Fermi-liquid behavior and spin excitations, with a nonmonotonic change in the Neel temperature as pressure increases. High-pressure x-ray diffraction shows an orthorhombic distortion occurring around the maximum of the Neel temperature. Computational analysis suggests that the loss of magnetism in U2Ni2Sn under pressure is mainly caused by 5f-band broadening due to the collapse of U-U dimers.
Article
Engineering, Manufacturing
Naor Elad Uzan, Roni Shneck, Ori Yeheskel, Nachum Frage
ADDITIVE MANUFACTURING
(2018)
Article
Engineering, Manufacturing
Asaf Pesach, Eitan Tiferet, Sven C. Vogel, Michael Chonin, Alexander Diskin, Lior Zilberman, Oleg Rivin, Ori Yeheskel, El'ad N. Caspi
ADDITIVE MANUFACTURING
(2018)
Article
Engineering, Manufacturing
T. Sol, S. Hayun, D. Noiman, E. Tiferet, O. Yeheskel, O. Tevet
ADDITIVE MANUFACTURING
(2018)
Article
Engineering, Manufacturing
Naor Elad Uzan, Shlomo Ramati, Roni Shneck, Nachum Frage, Ori Yeheskel
ADDITIVE MANUFACTURING
(2018)
Article
Nuclear Science & Technology
Aryeh M. Weiss, Itzhak Halevy, Naida Dziga, Ernesto Chinea-Cano, Uri Admon
JOURNAL OF NUCLEAR ENGINEERING AND RADIATION SCIENCE
(2017)
Article
Nuclear Science & Technology
Ilan Yaar, Rony Hakmon, Itzhak Halevy, Ronen Bar-Ziv, Noah Vainblat, Yacov Iflach, Maor Assulin, Tzipora Avraham, Michael D. Kaminski, Terry Stilman, Shannon Serre
JOURNAL OF NUCLEAR ENGINEERING AND RADIATION SCIENCE
(2017)