Article
Chemistry, Physical
Wojciech Polkowski, Grzegorz Bruzda, Adelajda Polkowska, Izabela Krzak, Adam Tchorz, Rafal Nowak, Artur Kudyba, Marzanna Ksiazek, Krzysztof Karczewski
Summary: In this study, the structure of selected Si-B binary alloys was investigated, revealing the co-existence of various silicon borides. The microstructure, crystal structure, and mechanical properties of each alloy were described based on experimental results. It was found that the mechanical properties of silicon borides (microhardness and Young modulus) increase with increasing boron content. The fracture toughness of silicon borides assessed through indentation experiments was found to be in the range of 2.13-3.29 MPa·m1/2.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
S. Ghods, R. Schur, R. Schleusener, A. Montelione, R. Pahuja, C. Wisdom, D. Arola, M. Ramulu
Summary: This study investigates the influence of build design on the tensile properties of Grade 5 Ti6Al4V produced by electron beam melting. It is found that part thickness is the most important factor affecting the mechanical properties. The vertical orientation is further influenced by part location, while the horizontal orientation is primarily influenced by microstructure.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Noa Lulu-Bitton, Eyal Sabatani, Brian A. Rosen, Natalie Kostirya, Gennadi Agronov, Eitan Tiferet, Noam Eliaz, Nissim U. Navi
Summary: The influence of electrochemical charging of hydrogen on the structural and mechanical behavior of Ti-6Al-4V alloys was investigated. The results showed that the length of the alpha/beta interphase boundaries in the EBM alloy was larger compared to that in the wrought alloy. The mechanical properties of the wrought alloy remained stable after 6 hours of charging, while the EBM alloy exhibited a gradual degradation in mechanical properties with charging time. The mode of fracture also differed between the two alloys, with the wrought alloy showing a change from ductile to semi-brittle fracture and the EBM alloy exhibiting a change from mixed mode fracture to brittle fracture. This study suggests that the EBM Ti-6Al-4V alloy is more susceptible to hydrogen embrittlement than the wrought Ti-6Al-4V alloy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Yang Yang, Lixiang Hu, Junyi Huang
Summary: In this study, Ti6Al4V alloy samples manufactured by selective electron beam melting technology, heat-treated samples, and hot-rolled Ti6Al4V alloy samples were investigated. The effects of microstructure and printed pores on the adiabatic shearing behavior were examined using various techniques. The results showed that the hot-rolled sample had the lowest adiabatic shearing susceptibility due to its fine equiaxed grains and absence of printed pores. The printed sample exhibited the highest susceptibility due to its high porosity, low density, and crystal orientation. The heat-treated sample had lower susceptibility than the printed sample due to its smaller porosity and larger density.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Viktor Sandell, Johan Nilsson, Thomas Hansson, Pia Akerfeldt, Marta-Lena Antti
Summary: The surfaces after chemical post-processing treatments of electron beam melting (EBM) produced Ti-6Al-4V were studied. The variation in surface quality with material removal depth was investigated using two chemical post-processing methods. The surface topography was characterized using white light interferometry and the subsurface defect distribution was studied using X-ray computed tomography (XCT). It was found that post-processing deteriorated the surface quality with increased removal depth and the distribution of sub-surface defects was anisotropic. Hirtisation (R) produced surfaces with higher roughness compared to chemically milled surfaces.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Sean Ghods, Reid Schur, Alex Montelione, Rick Schleusener, Dwayne D. Arola, Mamidala Ramulu
Summary: The fatigue properties of Grade 5 Ti6Al4V from Electron Beam PBF were investigated and compared with the machined surface condition. The results showed that the fatigue life decreased with decreasing part diameter and increasing radial distance. The surface topography and internal lack of fusion (LOF) defects, exposed surface LOF defects, and rogue defects played important roles in the fatigue failure for the as-built and machined conditions, respectively. X-ray micro-computed tomography (XCT) was used to determine the porosity parameters for fatigue life prediction. Placing parts near the center of the build plane to minimize porosity and machining to minimize underlying porosity were found to improve fatigue resistance.
Article
Chemistry, Physical
Vladimir V. V. Skripnyak, Kristina V. Iohim, Vladimir A. A. Skripnyak
Summary: In this paper, the deformation and fracture of Ti-5Al-2.5Sn alloys were studied using the punch test at moderate strain rates. A micromechanical damage model coupled with a viscoplastic constitutive model was employed to describe the plastic flow and fracture behavior. Numerical simulations were carried out to validate the used constitutive relations, and the results showed good agreement with experimental data. The dynamic punch test was found to be suitable for evaluating damage kinetics under complex stress states.
Article
Nanoscience & Nanotechnology
Hao Deng, Sheng Cao, James C. Williams, Longqing Chen, Wenbin Qiu, Lvjun Zhou, Jun Tang
Summary: This study investigated the microstructure evolution and mechanical properties of a near beta alloy Ti-5Al-5Mo-5V-3Cr-1Zr fabricated by additive manufacturing. It found that a graded hierarchical microstructure was formed in-situ from an alpha+beta lamellar microstructure at the specimen bottom to an alpha p+alpha s bi-lamellar microstructure at the specimen top, which resulted in a hardening effect attributed to the precipitation of fine secondary alpha.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Ignacio Bustos, Marcos Bergant, Alejandro Yawny
Summary: The suitability of infrared thermography (IRT) for estimating the fatigue limit of Ti-6Al-4V produced by electron beam melting (EBM) is assessed. The IRT-based methods are appropriate for machined and polished HIPed EBM specimens, as well as wrought material, but not for other printed material conditions. This is due to the presence of surface roughness and internal defects that hinder surface thermal manifestation in non HIP treated EBM-produced material.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Crystallography
Hany S. Abdo, Ubair Abdus Samad, Jabair Ali Mohammed, Sameh A. Ragab, Asiful H. Seikh
Summary: The corrosion behavior of a newly fabricated gamma-TiAl alloy was studied using electrochemical techniques in different environments. The results indicated that the alloy exhibited good corrosion resistance under certain temperature and immersion time conditions.
Article
Nanoscience & Nanotechnology
Sridhar Niverty, Nikhilesh Chawla
Summary: In this study, x-ray computed tomography was utilized to investigate the corrosion behavior of dissimilar alloy couples, followed by corrosion fatigue testing and post fracture failure analysis. The precise locations of corrosion pitting damage in the specimen were studied with respect to corrosion time. Microstructural factors that contribute to crack initiation were identified using a correlative microscopy-based approach and discussed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Boning Yu, Yuming Li, Boussad Abbes, Shujun Li, Baoyi Yu
Summary: This study investigates the fatigue behavior and failure mechanism of rhomboidal dodecahedral cell structure prepared by electron beam melting, and improves fatigue performance through cryogenization treatment. The results show that the mapping ratio significantly affects the mechanical and fatigue properties.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Crystallography
Jiangtao Ran, Xiaojing Sun, Shiliang Wei, Zhuo Chen, Hong Zhao
Summary: This study focused on the effects of extracted position and characterization direction on the microstructure, defect distribution, and Vickers hardness of TA15 titanium alloy fabricated by electron beam melting. Results showed differences in microstructure, defect distribution, and density between longitudinal and transversal directions, providing important insights for optimizing manufacturing processes.
Article
Materials Science, Multidisciplinary
Zhiqiang Cao, Hao Deng, Hongjie Bai, Hui Wang, Wenbin Qiu, Longqing Chen, Daijian Wu
Summary: This study investigates the microstructure and mechanical properties of near beta Ti-5Al-5Mo-5V-1Cr-1Fe (Ti55511) alloy fabricated using the electron beam melting (EBM) technique. The results show the formation of columnar prior beta grains with a < 100> texture on a vertical plane. Additionally, a lamellar structure with alpha phase (56% vol.) and retained beta phase (44% vol.) is observed within the prior beta grains. Tensile tests reveal high ductility and strength in both orientations of the EBM-fabricated specimens. The anisotropy in mechanical properties is attributed to the morphological difference between the prior beta grains along the vertical and horizontal directions.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Sijia Wang, Jixin Yang, Jianfei Sun, Wenxiang Shu, Haibin Yang, Alfonso H. W. Ngan, Yongjiang Huang
Summary: Here, TA15 samples near alpha titanium alloy were fabricated using electron beam selective melting (EBSM), and their high-temperature tensile deformation behaviors were studied. The results showed that the samples exhibited work hardening and softening at different temperatures, and the EBSM-built TA15 samples had excellent mechanical properties at medium temperatures. These findings are helpful for the industrial applications of EBSM-built titanium alloy components in the aerospace fields.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Richard Smith, Robert Lancaster, Jonathan Jones, Julian Mason-Flucke
Article
Engineering, Mechanical
J. Palmer, J. Jones, A. Dyer, R. Smith, R. Lancaster, M. Whittaker
INTERNATIONAL JOURNAL OF FATIGUE
(2019)
Article
Nanoscience & Nanotechnology
D. T. S. Lewis, R. J. Lancaster, S. P. Jeffs, H. W. Illsley, S. J. Davies, G. J. Baxter
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Chemistry, Physical
Hani Hilal, Robert Lancaster, Spencer Jeffs, John Boswell, David Stapleton, Gavin Baxter
Article
Materials Science, Multidisciplinary
Hani Hilal, Robert Lancaster, Dave Stapleton, Gavin Baxter
Article
Engineering, Mechanical
J. Jones, M. Whittaker, R. Lancaster, C. Hyde, J. Rouse, B. Engel, S. Pattison, S. Stekovic, C. Jackson, H. Y. Li
INTERNATIONAL JOURNAL OF FATIGUE
(2020)
Article
Engineering, Mechanical
S. Stekovic, J. P. Jones, B. Engel, M. T. Whittaker, V Norman, J. P. Rouse, S. Pattison, C. J. Hyde, P. Harnman, R. J. Lancaster, D. Leidermark, J. Moverare
INTERNATIONAL JOURNAL OF FATIGUE
(2020)
Article
Materials Science, Multidisciplinary
Jing Li, Spencer Jeffs, Mark Whittaker, Nigel Martin
MATERIALS & DESIGN
(2020)
Article
Chemistry, Physical
Jing Li, Spencer Jeffs, Mark Whittaker, Nigel Martin
Article
Nanoscience & Nanotechnology
R. J. Lancaster, S. J. Davies, S. P. Jeffs, D. T. S. Lewis, M. P. Coleman
Summary: The study found that exposure to service temperatures causes microstructural and chemical alterations in LPBF and cast C263 samples, directly affecting mechanical response. The thermal exposure program demonstrated that with the precipitation of carbide phases in the exposed LPBF variant, grain boundary morphologies are highly comparable to the wrought equivalent of the same alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Spencer Jeffs, Robert Lancaster, Gareth Davies, William Hole, Brenna Roberts, David Stapleton, Meurig Thomas, Iain Todd, Gavin Baxter
Summary: The study found relationships between process parameters, microstructural characteristics, and impact energy results in AM materials, with vertically built specimens exhibiting higher impact energy and beam velocity displaying the most significant influence on impact energy results.
Article
Materials Science, Multidisciplinary
John Boswell, Jonathan Jones, Nicholas Barnard, Daniel Clark, Mark Whittaker, Robert Lancaster
Summary: This study investigates the effects of crystal structure and heat treatment on the performance of LPBF Haynes 282 superalloy. By varying processing variables and heat treatment methods, the material structure was successfully homogenized, improving material isotropy. The research provides important insights for producing more reliable aerospace materials using LPBF technology.
MATERIALS & DESIGN
(2021)
Review
Materials Science, Multidisciplinary
Rory Douglas, Robert Lancaster, Thomas Jones, Nicholas Barnard, Jack Adams
Summary: This article reviews the typical lifecycle of stainless steel 316L powder in L-PBF, the changes that occur to the powder feedstock, and the effects that this may have on the mechanical properties of components manufactured with recycled powder.
ADVANCED ENGINEERING MATERIALS
(2022)