Article
Chemistry, Multidisciplinary
Amos Muiruri, Maina Maringa, Willie du Preez
Summary: This paper investigates the high strain rate and temperature properties of heat-treated Ti6Al4V(ELI) samples produced by direct metal laser sintering (DMLS). The study found that the heat-treated DMLS Ti6Al4V(ELI) alloys were sensitive to strain rate and temperature, with samples of finer microstructure exhibiting higher dynamic strength and lower strain, and samples of coarse microstructure showing lower dynamic strength and higher strain. Additionally, the cut surfaces of the tested samples were characterized by a network of adiabatic shear bands (ASBs) with cracks propagating along them, with the thickness of ASBs varying with strain rate, temperature, and alloy forms.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
C. Sanchez de Rojas Candela, A. Riquelme, V. Bonache, P. Rodrigo, J. Rams
Summary: In this study, highly reinforced Ti6Al4V matrix composites with SiC particles were successfully additively manufactured using direct laser deposition. The laser scanning speed was found to significantly affect the geometry, microstructure, and microhardness of the samples. The effect of SiC particle sizes and concentrations on the microstructure and the reaction mechanisms were evaluated. The results demonstrated that the reinforcement percentage was lower than expected due to the reactivity between the reinforcement and matrix, resulting in the formation of TiC and Si5Ti3. The findings have important implications for optimizing the additive manufacturing process and the final properties of composite materials.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Automation & Control Systems
Cemal Irfan Caliskan, Mert Coskun, Gokhan Ozer, Ebubekir Koc, Turgut Azer Vurkir, Gokay Yondem
Summary: This study explores the unsupported manufacturability and efficiency of CCC geometries in different cross-sections, finding that pentagon shapes have the most efficient cooling capacity. The research reveals that production-induced sagging affects the flow in channel geometries produced without CCC supports.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Shayu Song, Guijian Xiao, Ying Liu, Kun Zhou, Shuai Liu, Jianchao Huang
Summary: Both texturing and residual stress have a positive impact on the tribological properties of the surface. A synergistic processing method involving laser and abrasive belt is proposed based on this effect. The results indicate that the co-processed surfaces show more regular and flatter textures with better retention of grooves. They also exhibit compressive stress, which leads to advantages in dry friction and boundary lubrication. When the residual compressive stress surpasses the initial stress, the surfaces demonstrate improved wear resistance, reducing wear depth by 56.88% (from 2.69 mm to 1.16 mm) and wear area width by 44.90% (from 689.41 mm to 379.84 mm).
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Physical
A. G. Aleksanyan, S. K. Dolukhanyan, O. P. Ter-Galstyan, G. N. Muradyan, N. L. Mnatsakanyan
Summary: The research focuses on developing a resource-saving and efficient technology for synthesizing Ti-6Al-4V alloy through the hydride cycle (HC) method, aiming to reduce the production cost of titanium alloys. The physicochemical, structural, and hydrogen-sorption characteristics of the alloy samples were thoroughly studied and optimized.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Hanjun Gao, Xin Li, Bianhong Li, Qiong Wu, Yandong Ma, Xiaojun Jian, Hechuan Song, Shuguang Chen
Summary: Thermal-vibratory stress relief (TVSR) is a novel method with significant advantages in reducing residual stress in Ti6Al4V compared to traditional methods. Through comparative studies on different process parameters and simulations, it is found that TVSR exhibits higher efficiency and rate in stress relief, with the potential for establishing quantitative relationships and analyzing effective parameter regions for stress relief mechanisms.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Coatings & Films
Hepeng Zhang, Zhongyi Cai, Wei Guo, Hongqiang Zhang, Jianfeng Yan, Guangzhi He, Yongxin Zhang, Rujian Sun, Zhigang Che
Summary: This paper investigates the effects of laser shock peening on the fatigue resistance of aircraft parts. The results show that the introduction of compressive residual stresses prolongs the fatigue life significantly.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Bowen Shi, Tao Li, Dong Wang, Xiaorui Zhang, Hongchao Zhang
Summary: This study investigates crack behavior and prevention of Ni60A coating by coaxial laser cladding. It found that nonuniform hard Cr-rich precipitates and large residual tensile stress are the main reasons for cracking, and thermal stress models were established to effectively reduce crack formation. Preheating the substrate can significantly decrease cracking rate, and a crack-free coating with higher microhardness can be achieved by adjusting process parameters.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Hepeng Zhang, Zhongyi Cai, Jiaxuan Chi, Rujian Sun, Zhigang Che, Hongqiang Zhang, Wei Guo
Summary: This study investigated the fatigue crack growth behavior in residual stress fields induced by laser shock peening (LSP) on Ti6Al4V titanium alloy and found that LSP significantly extended the fatigue life. The significant crack retardation observed at high compressive stress levels was attributed to the reduction of local stress. The superposition principle combined with the weight function method was used to predict the fatigue crack growth rate in residual stress fields.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Shuguang Chen, Jinlong Ma, Hanjun Gao, Yesong Wang, Xun Chen
Summary: The study investigates the effects of thermal-vibration stress relief (TVSR) on Ti6Al4V samples prepared by selective laser melting (SLM). It compares TVSR with thermal stress relief (TSR) and vibration stress relief (VSR), and discusses the relief mechanisms. The results show that TVSR can achieve a residual stress relief rate of 86.76% with a temperature of 380°C and a dynamic stress of 400 MPa, which is a significant improvement compared to VSR and TSR methods. TVSR has the ability to control residual stress with low time and cost consumption.
Article
Chemistry, Physical
M. S. Silva, D. A. G. Ribeiro, E. S. Rodrigues, J. C. A. Santos, D. C. Silva, R. S. Silva
Summary: In this study, we investigated the influence of laser sintering parameters on the micro-structures and electrical properties of La-doped barium titanate. Various techniques were used to examine the structure and properties of the ceramics, revealing a Positive Temperature Coefficient Resistors (PTCR) effect and a strong dependence on heating and cooling rates for the electrical properties.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yi-wa Luo, Ming-yong Wang, Ji-guo Tu, Yu Jiang, Shu-qiang Jiao
Summary: The in situ method developed to reduce residual stress and improve mechanical strength of porous Ti alloys during laser additive manufacturing involves double laser scanning immediately after solidification of the molten powder. Rescanning with reduced energy density can lead to significant reductions in residual stress and improved bonding conditions for the alloy. Adjusting the rescanning laser power is necessary to ensure dimensional accuracy when preparing porous Ti with thick cell walls.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2021)
Article
Automation & Control Systems
Zipeng Ouyang, Hongxi Jin, Qunlin Cheng, Wenqi Chen, Yanhong Wei, Jicheng Chen
Summary: This paper investigates the laser melt injection (LMI) process for producing ceramic particles reinforced metal matrix composites (MMCs) and proposes a finite element model to analyze the thermal-mechanical characteristics and crack formation mechanism. The experiments show the effects of laser power and scanning velocity on track dimensions, particle distribution, and crack morphology. The results reveal the distribution of residual stresses and the formation of cracks at both macro and micro scales.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Chieko Kuji, Hitoshi Soyama
Summary: By using laser cavitation for mechanical surface treatment, the fatigue properties of additive manufactured metals can be improved, with reduced surface roughness and stress, and increased hardness, resulting in an extended fatigue life.
Article
Nanoscience & Nanotechnology
Shu-guang Chen, Yi-du Zhang, Qiong Wu, Han-jun Gao, Zi-han Gao, Xin Li
Summary: Residual stress in SLM Ti6Al4V is influenced by solid-state phase transformation, which is investigated in this study using a thermo-metallurgical-mechanical coupled modeling approach. The results show that the residual stress is mainly determined by the volume change between solid-state phases caused by the phase transformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
A. M. Vilardell, A. Takezawa, A. du Plessis, N. Takata, P. Krakhmalev, M. Kobashi, I. Yadroitsava, I. Yadroitsev
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Review
Materials Science, Multidisciplinary
Anton du Plessis, Ina Yadroitsava, Igor Yadroitsev
MATERIALS & DESIGN
(2020)
Article
Engineering, Biomedical
A. M. Vilardell, A. Takezawa, A. du Plessis, N. Takata, P. Krakhmalev, M. Kobashi, M. Albu, G. Kothleitner, I Yadroitsava, I Yadroitsev
Summary: This study reports the first incorporation of copper directly into cellular lattice structures for implant applications through in-situ alloying. The new alloy, combining Ti6Al4V(ELI) and pure Cu powders, produced lattice structures with improved antibacterial properties. Microstructural and mechanical characterizations revealed that in-situ alloying with copper led to enhanced hardness and strength, showing promising potential for direct manufacturing of antibacterial implants.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Engineering, Manufacturing
A. M. Vilardell, I Yadroitsev, I Yadroitsava, M. Albu, N. Takata, M. Kobashi, P. Krakhmalev, D. Kouprianoff, G. Kothleitner, A. du Plessis
ADDITIVE MANUFACTURING
(2020)
Article
Engineering, Manufacturing
Mfanufikile Shange, Ina Yadroitsava, Anton du Plessis, Igor Yadroitsev
Summary: The study investigated the surface roughness and near-surface porosity resulting from unsupported overhangs at varying inclination angles and orientations during manufacturing Ti6Al4V parts with a high-speed and high-power LPBF system. Results showed that surface roughness and porosity vary as a function of inclination angle.
3D PRINTING AND ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Physical
Anna Martin Vilardell, Pavel Krakhmalev, Ina Yadroitsava, Igor Yadroitsev, Natalia Garcia-Giralt
Summary: The study demonstrates that implants containing 3% Cu do not exhibit cytotoxicity to cells, supporting cell proliferation and enhancing mineralization capacity, particularly when 3% Cu is present in as-built samples. Additionally, surface roughness inhibits cell proliferation while promoting cell mineralization capacity.
Article
Materials Science, Multidisciplinary
Anna Martin Vilardell, Ina Yadroitsava, Winston Kagisho Curtis Wolf, Anton Du Plessis, Muofhe Tshibalanganda, Dean-Paul Kouprianoff, Natalia Garcia-Giralt, Makoto Kobashi, Igor Yadroitsev
Summary: Additive manufacturing (AM) can enhance the functionality and design customization of medical applications. This study focused on the manufacturing and characterization of a polyamide-copper composite, which showed promising properties for medical applications.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
D. Kouprianoff, I Yadroitsava, A. du Plessis, N. Luwes, I Yadroitsev
Summary: This paper demonstrates an approach to using acoustic emission for online monitoring of the L-PBF process. Analysis of acoustic signals allows for identification of characteristic amplitudes and frequencies, supporting its use as a complementary method for real-time defect detection.
FRONTIERS IN MECHANICAL ENGINEERING-SWITZERLAND
(2021)
Article
Metallurgy & Metallurgical Engineering
N. V. Kazantseva, P. V. Krakhmalev, I. A. Yadroitsava, I. A. Yadroitsev
Summary: The study examined the features of 3D printing, focusing on laser melting of metal powders. It reviewed the impact of laser operation mode on the structure, residual stresses, and properties of manufactured metals, and proposed a method for choosing process parameters using single tracks as universal for all types of metal laser 3D printers. Additionally, it presented the structural characteristics and medical requirements for biocompatible materials, specifically discussing the biocompatible Ti-6Al-4V alloy manufactured by selective laser melting.
PHYSICS OF METALS AND METALLOGRAPHY
(2021)
Article
Engineering, Industrial
J. A. Wessels, A. du Plessis, I Yadroitsava, J. Elsa, I Yadroitsev
SOUTH AFRICAN JOURNAL OF INDUSTRIAL ENGINEERING
(2020)
Article
Engineering, Industrial
H. W. Huysamen, W. A. Kinnear, T. E. Fonternel, E. W. Turton, I Yadroitsava, I Yadroitsev
SOUTH AFRICAN JOURNAL OF INDUSTRIAL ENGINEERING
(2020)
Proceedings Paper
Engineering, Multidisciplinary
M. Shange, I Yadroitsava, S. Pityana, I Yadroitsev, D. Bester
CONFERENCE OF THE SOUTH AFRICAN ADVANCED MATERIALS INITIATIVE (COSAAMI 2019)
(2019)
