Article
Chemistry, Physical
Tim Pasang, Benny Tavlovich, Omri Yannay, Ben Jackson, Mike Fry, Yuan Tao, Celine Turangi, Jia-Chang Wang, Cho-Pei Jiang, Yuji Sato, Masahiro Tsukamoto, Wojciech Z. Misiolek
Summary: A study was conducted to investigate the mechanical properties of Ti6Al4V produced by additive manufacturing compared to wrought alloys. Differences were found in microstructures, hardness, surface roughness, and tensile strength among the samples. The ductility of the wrought alloy was consistently higher than that of the additive manufactured Ti6Al4V.
Article
Nanoscience & Nanotechnology
Samuel Milton, Olivier Rigo, Sebastien LeCorre, Antoine Morandeau, Raveendra Siriki, Philippe Bocher, Rene Leroy
Summary: Additive Manufacturing (AM) processes like Selective Laser Melting (SLM) and Electron Beam Melting (EBM) were used to fabricate Ti6Al4V parts, and the machining behavior of these parts was studied. The microstructure and mechanical properties of the material were found to be strongly influenced by the type of AM process and subsequent heat treatment, impacting the machinability of the parts.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Zhongqiang Liu, Zhen Wang, Chaofeng Gao, Ruiping Liu, Zhiyu Xiao
Summary: This paper studied the surface roughness, microstructure, mechanical properties, and very high cycle fatigue behavior of Ti6Al4V fabricated by selective electron beam melting. Results showed that the mechanical properties in the xoz direction are better than those in the xoy direction, and the sample still undergoes fatigue fracture at very high cycle fatigue.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Engineering, Multidisciplinary
Zhiguang Zhou, Yunzhong Liu, Xiaohui Liu, Qiangkun Zhan, Kaidong Wang
Summary: In situ TiB reinforced titanium matrix composites were fabricated via selective laser melting, with optimized processing to achieve crack-free and fully dense composites. The distribution of TiB reinforcement in the composites was mainly in the form of whisker clusters, showing different distributions in TMC1 and TMC2. The improvement in mechanical properties of the composites was attributed to Hall-Petch strengthening and load-bearing transformation strengthening.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Zhongpeng Zheng, Xin Jin, Yuchao Bai, Yun Yang, Chenbing Ni, Wen Feng Lu, Hao Wang
Summary: Anisotropies have been found in the microstructure and mechanical properties of SLM Ti-6Al-4V alloy, with the most pronounced anisotropy observed in the 0 degrees scanning strategy. The size of primary columnar crystals on the front surface is significantly larger than that on the top surface, with a microhardness difference of approximately 30%. A modified Johnson-Cook constitutive model for the SLM Ti6Al4V alloy has been developed with good accuracy for modeling and simulation purposes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Shun Guo, Yinan Li, Jieren Gu, Jie Liu, Yong Peng, Pengkun Wang, Qi Zhou, Kehong Wang
Summary: x wt.% B4C/Ti6Al4V titanium matrix composites were prepared by selective laser melting (SLM) technology. The microstructure and mechanical properties of the SLM-formed and heat-treated samples were studied in detail. The results showed that an in-situ reaction occurred during the SLM process, resulting in the formation of TiB, TiC, and TiC. The mechanical properties and microstructure of the composites were influenced by the solution temperature, with higher temperatures leading to increased grain size and agglomeration of the in-situ reaction products.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Automation & Control Systems
Raffaele Sepe, Alessandro De Luca, Venanzio Giannella, Rosario Borrelli, Stefania Franchitti, Francesco Di Caprio, Francesco Caputo
Summary: This paper experimentally investigates the influence of dimension, building position, and orientation on the mechanical properties of Ti6Al4V trusses. The results show that truss diameter, specimen position, and orientation have an impact on the mechanical properties. Trusses with a diameter of 2 mm manufactured at 45 degrees demonstrate the best performance, while trusses with a diameter of 2 mm manufactured at 90 degrees display the highest elongation at fracture.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Xina Huang, Shoubin Ding, Wen Yue
Summary: The effect of cryogenic treatment on the microstructure and mechanical properties of Ti6Al4V alloy fabricated using electron beam melting (EBM) was systematically investigated in this study. The results show that cryogenic treatment can refine the microstructure and enhance the mechanical properties of the alloy, especially with a soaking time of 48 hours.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Yaron Itay Ganor, Eitan Tiferet, Sven C. Vogel, Donald W. Brown, Michael Chonin, Asaf Pesach, Amir Hajaj, Andrey Garkun, Shmuel Samuha, Roni Z. Shneck, Ori Yeheskel
Summary: The study investigated post-processing methods for additively manufactured Ti64 components, including heat treatments and HIP cycles, to modify microstructure and mechanical properties. Results showed that lowering the HIP holding temperature retained a fine microstructure, increased elongation and fatigue life. Higher HIP temperature resulted in coarser microstructure and lower Vickers hardness, but superior elongation and fatigue resistance.
Article
Nanoscience & Nanotechnology
J. Karimi, C. Suryanarayana, I Okulov, K. G. Prashanth
Summary: This study investigated the effect of remelting on the microstructure and mechanical properties of Ti6Al4V materials fabricated using selective laser melting. The results showed that the number of remeltings significantly influenced the homogenization of the microstructure and mechanical properties of the materials, with an increase in hardness and ultimate tensile strength but a decrease in ductility observed with a higher number of melting steps.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Industrial
Chen Yang, Zhanyong Zhao, Peikang Bai, Wenbo Du, Sheng Zhang
Summary: The effect of nano-SiC whisker on the microstructure and mechanical properties of Ti6Al4V alloy manufactured by selective laser melting was investigated. The addition of a trace amount of SiCw transformed the microstructure to have fine equiaxed grains, and in situ formed nanosized TiC particles promoted grain refinement through various mechanisms. The mechanical properties of the Ti6Al4V alloy were significantly improved by adding SiCw, with increased microhardness and ultimate tensile strength while maintaining good ductility.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
K. M. Bertsch, T. Voisin, J. B. Forien, E. Tiferet, Y. Ganor, M. Chonin, Y. M. Wang, M. J. Matthews
Summary: Effective optimization of Ti-6Al-4 V production using AM requires understanding the importance of different microstructural features to deformation and failure mechanisms. This study compared the tensile response and deformation mechanisms of EBM and SLM AM Ti-6Al-4 V materials and evaluated the influence of phase distribution, defect density, and porosity on material strength and ductility. The results suggest that phase distribution and defect density are crucial for determining material strength and maximum strain to failure, while porosity limits part ductility.
MATERIALS & DESIGN
(2022)
Article
Engineering, Manufacturing
Yang Li, Wenbin Kan, Yanming Zhang, Mingzhi Li, Xiaoyu Liang, Yefeng Yu, Feng Lin
Summary: This study successfully prepared IN738LC superalloy specimens using Electron Beam Selective Melting, established a defect-free criterion, and determined a processing window with a proper energy density. The research identified the strengthening and fracture mechanisms of critical size gamma' phases and carbides at different temperatures, as well as different fracture mechanisms in PBD and OBD specimens through tensile tests and fractographic analyses.
ADDITIVE MANUFACTURING
(2021)
Review
Engineering, Manufacturing
Necati Ucak, Adem cicek, Kubilay Aslantas
Summary: In recent years, additive manufacturing (AM) of metallic parts has provided new opportunities for various industrial sectors and individual needs. While AM offers many advantages, poor surface quality of the produced parts is a common issue that requires additional machining operations. This review article investigates the machinability of 3D printed metallic parts fabricated by Selective Laser Melting (SLM) and Electron Beam Melting (EBM) technologies, and provides insights into their mechanical and physical properties. The article aims to compile relevant information and suggest machining strategies for these novel engineering materials, as well as highlight potential areas for future research.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Multidisciplinary
Hui Wang, Dongdong He, Weidong Huang, Xinxi Chen, Yu Wang, Lihong Huang
Summary: In this study, LaB6-reinforced Ti6Al4V was fabricated by the SLM process. TiB and La2O3 particles with different sizes were formed through the in-situ reaction. The mechanical properties of the LaB6/Ti6Al4V samples were significantly improved due to the combined strengthening effect. However, this effect was influenced by the SLM parameters.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Georg Schnell, Christian Polley, Robert Thomas, Stephan Bartling, Johannes Wagner, Armin Springer, Hermann Seitz
Summary: In this study, the researchers used a customized instrument to investigate the lateral adhesion forces on femtosecond laser-structured surfaces. They found that the droplet motion was significantly influenced by the chemical and topographical surface features. The droplet mobility was classified into static, transfer, and kinetic regimes, which is crucial for designing surfaces with extreme wetting characteristics.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Biomedical
A. Weizel, T. Distler, R. Detsch, A. R. Boccaccini, H. Seitz, S. Budday
Summary: Numerical simulations using appropriate material models and parameters are valuable for understanding the effects of mechanical stimulation on hydrogels for cartilage replacement. In this study, hyperviscoelastic material parameters for human articular cartilage and two replacement materials were identified using COMSOL Multiphysics (R) v. 5.6. The results revealed that ADA-GEL and ChondroFiller(liquid) exhibit faster stress relaxation and lower relaxation time constants compared to cartilage. Additionally, ADA-GEL and ChondroFiller(liquid) have a predominant elastic response, while cartilage has a predominant viscoelastic response.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Abdullah Riaz, Christian Polley, Henrik Lund, Armin Springer, Hermann Seitz
Summary: By fabricating a composite scaffold of titanium alloy (Ti6Al4V) and barium titanate (BaTiO3), the biomechanical stability of Ti6Al4V is combined with the electrical activity of BaTiO3, offering potential for the treatment of critical-size bone defects in load-bearing areas.
MATERIALS & DESIGN
(2023)
Article
Engineering, Mechanical
Georg Schnell, Timon Mueller, Hermann Seitz
Summary: Laser surface texturing is widely used to improve tribological behavior, with small chevron microstructures being effective in reducing friction and wear. However, the effect of microstructure size on lubricated contacts is not well-studied. This study used a 300-femtosecond laser to create chevron microstructures with different dimensions and found that small-scale microstructures significantly improved tribological performance, while large-scale microstructures showed no substantial change.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Tim Dreier, Abdullah Riaz, Alexander Ahrend, Christian Polley, Stefanie Bode, Benjamin Milkereit, Hermann Seitz
Summary: Composite Extrusion Modeling (CEM) is a screw-based material extrusion (MEX) additive manufacturing process that can produce plastic, metal and ceramic parts. This study investigates the processing of aluminum oxide feedstock (Al2O3) for the first time using the CEM process. The optimal process parameters for achieving highly dense green parts were determined, and the debound and sintered parts were also evaluated.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Hafiz Ahmed Waqas, Muhammad Waseem, Abdullah Riaz, Muhammad Ilyas, Muhammad Naveed, Hermann Seitz
Summary: The design and construction of precast reinforced box culverts need to be improved to meet contemporary demands of reliability and affordability. This research aims to develop an effective and affordable design improvement procedure for a precast box culvert using modern numerical tools. The study reveals that adjusting the haunch geometry and adding reinforcement significantly affect the load-carrying capacity of a culvert, with a potential 25% increase achievable.
Article
Pharmacology & Pharmacy
Robert Mau, Thomas Eickner, Gabor Juettner, Ziwen Gao, Chunjiang Wei, Nicklas Fiedler, Volkmar Senz, Thomas Lenarz, Niels Grabow, Verena Scheper, Hermann Seitz
Summary: A study investigates the long-term medical treatment of the inner ear using patient-individualized drug-releasing implants inserted in the middle ear. Guinea pig round window niche implants loaded with dexamethasone were manufactured with high precision using micro injection molding and tested for drug release, biocompatibility, and bioefficacy in vitro.
Article
Pharmacology & Pharmacy
Natalia Rekowska, Katharina Wulf, Daniela Koper, Volkmar Senz, Hermann Seitz, Niels Grabow, Michael Teske
Summary: Novel 3D printing techniques enable the development of medical devices with personalized drug delivery systems. However, retaining the pharmaceutical functions of proteins remains challenging due to possible crosslinking and the choice of photopolymers.
Article
Engineering, Mechanical
Georg Schnell, Hauke Studemund, Robert Thomas, Hermann Seitz
Summary: This study investigates the effect of partial texturing on the tribological performance of journal bearings using the relatively new technique of femtosecond laser texturing. The research findings show that textures in the high-load region of journal bearings provide the highest lubricant film thickness and lowest friction. Moreover, asymmetric texture designs have a detrimental effect on lubrication performance compared to symmetric designs.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Polymer Science
Timo Banko, Stefan Gruenwald, Rainer Kronberger, Hermann Seitz
Summary: This paper presents a novel approach to manufacturing components with integrated conductor paths using fused filament fabrication (FFF) and isotropic conductive adhesive (ICA). The approach involves embedding the ICA into a printed groove and sealing it with a wide extruded plastic strand. Through parameter studies, a consistent cavity for uniform formation of the ICA path was obtained.
Article
Engineering, Biomedical
Christian Polley, Thomas Distler, Caroline Scheufler, Rainer Detsch, Henrik Lund, Armin Springer, Dominik Schneidereit, Oliver Friedrich, Aldo R. Boccaccini, Hermann Seitz
Summary: Bone healing is a complex process that involves various factors such as mechanical, chemical, and electrical cues. Scientists worldwide aim to create synthetic biomaterials that combine these factors to achieve tailored and controlled tissue regeneration. This study presents a method using additive manufacturing techniques to create macroporous biomaterial scaffolds made of a piezoelectric and bioactive ceramic-crystallized glass composite. These scaffolds show suitable mechanical strength, bioactivity, and piezoelectric properties, making them promising candidates for bone tissue engineering.
MATERIALS TODAY BIO
(2023)
Meeting Abstract
Cell & Tissue Engineering
Kaarthik Sridharan, Tawakalitu Waheed Okikiola, Wolfgang Krueger, Juliane Meyer, Mario Thuerling, Hermann Seitz, Mareike Meister, Kai Masur, Olga Hahn, Kirsten Peters
TISSUE ENGINEERING PART A
(2023)
Correction
Materials Science, Biomaterials
Sonja Vaupel, Robert Mau, Selin Kara, Hermann Seitz, Udo Kragl, Johanna Meyer
JOURNAL OF MATERIALS CHEMISTRY B
(2023)
Article
Multidisciplinary Sciences
Christoph Drobek, Juliane Meyer, Robert Mau, Anne Wolff, Kirsten Peters, Hermann Seitz
Summary: In order to use regeneratively active cells for cell therapeutic applications, we need to isolate these cells from their resident tissues. The process of cell isolation can subject the cells to mechanical strain, which can affect their viability and yield. Therefore, it is important to have knowledge of the cell volumetric mass density to optimize the isolation procedures. Existing methods for measuring cell volumetric mass density are time-consuming or require special setup. Thus, we have developed a user-friendly method based on readily available instrumentation. This method is based on the linear relationship between the volumetric mass density of the cell suspension and the volumetric mass density, number, and diameter of the cells in the suspension. We have used this method to determine the volumetric mass density of mesenchymal stem cells (MSCs) and compared it to results from the established density centrifugation technique.
Article
Materials Science, Biomaterials
Sonja Vaupel, Robert Mau, Selin Kara, Hermann Seitz, Udo Kragl, Johanna Meyer
Summary: Hydrogels are highly absorbent polymeric networks that can absorb more than 90% of water. They have the ability to retain their shape while swelling and possess various interesting properties including biocompatibility and antimicrobial activity. Hydrogels are suitable for medical applications, particularly in drug delivery systems. Polyelectrolyte-based hydrogels have shown promising properties for long-term and stimulus-responsive applications. However, complex structures and shapes are challenging to achieve using conventional polymerization methods, which can be overcome by additive manufacturing. 3D printing technology using photopolymerizing methods allows the fabrication of complex and customizable designs with high resolution and control. In this study, hydrogels composed of AETMA and PEGDA were 3D printed using Digital Light Processing, demonstrating high swelling degree and adjustable mechanical properties. The hydrogels showed stimulus-responsive drug release behavior and could be printed in complex hollow geometry. This work presents a flexible and swellable material that combines the properties of hydrogels with the ability to print complex shapes.
JOURNAL OF MATERIALS CHEMISTRY B
(2023)
