Article
Materials Science, Multidisciplinary
Z. W. Wang, M. Liu, H. Zhang, G. M. Xie, P. Xue, L. H. Wu, Z. Zhang, D. R. Ni, B. L. Xiao, Z. Y. Ma
Summary: This study compared the structure-property relationships of Q&P 1180 steel joints welded by laser welding, TIG welding, and friction stir welding. The results showed that laser welding and friction stir welding achieved excellent tensile strength comparable to the parent metal while maintaining material hardness, whereas TIG welding resulted in significant softening and strength loss.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Guilherme Jose dos Santos, Tiago Cristofer Aguzzoli Colombo, Ronnie Rodrigo Rego, Jorge Otubo
Summary: This study investigates the integrity evolution induced by manufacturing involving dissimilar TWIP and mild steel weld spots, with a focus on the effect of manufacturing parameters on controlling the dilution of alloying elements and resulting weld integrity. Samples manufactured under different conditions were analyzed for chemical and phase composition, morphology, and mechanical properties. The findings demonstrate that the distribution of chemical composition and metallurgical features is sensitive to welding parameters, and manufacturing influences weld morphology. Manganese distribution is affected by the welding cycle, resulting in austenite destabilization and brittle behavior in quasi-static tensile shear strength tests. A processing set is proposed to control manganese dilution and martensite transformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Civil
Mehran Ghafouri, Antti Ahola, Joseph Ahn, Timo Bjork
Summary: This study investigates the influence of welding sequences and external constraints on angular distortion and residual stresses in short fillet welds made of high strength steel. The findings show that external constraint has a larger impact than welding sequence on the development of angular distortion and peak residual stresses. Furthermore, the results demonstrate that short fillet welds have larger peak magnitudes of localized transverse residual stress fields compared to continuous fillet welds. The stiffness of external constraint has a greater influence on preventing angular distortion in continuous fillet welds than in short fillet welds.
ENGINEERING STRUCTURES
(2022)
Article
Optics
Wei Cheng, Xiaolei Zhang, Jinzhong Lu, Fengze Dai, Kaiyu Luo
Summary: The research found that laser oscillation welding can reduce spattering during the welding process, leading to a better macroscopic morphology, but slightly lower shear and tensile strengths in the welded joint.
Article
Automation & Control Systems
Dawei Zhao, Nikita Vdonin, Lyudmila Radionova, Lev Glebov, Vitaly Bykov
Summary: This study investigates the effects of welding time, welding current, and cooling time on the microstructure and mechanical properties of HSLA 420 steel, and identifies the optimal post-welding parameters through optimization techniques. The results show that under the optimal conditions, the peak load and absorbed energy of the spot welds increase compared to conventional single-pulse welds.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Mikko Hietala, Mohammed Ali, Ali Khosravifard, Markku Keskitalo, Antti Jarvenpaa, Atef Hamada
Summary: The tensile-shear strength of laser-welded lap joints in abrasion resistance ultra-high strength ARS-600 steel was optimized through evaluation of joints achieved with different welding parameters and configurations. The microstructural evolution of the fusion zone was characterized using electron backscatter diffraction (EBSD), and stress analysis of different weld patterns was conducted using finite element method (FEM).
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Marine
Jacek Tomkow, Michal Landowski, Dariusz Fydrych, Grzegorz Rogalski
Summary: The study examined the possibility of underwater wet welding with different thicknesses of S1300 ultra-high strength steel using visual, metallographic, macro- and microscopic tests, as well as Vickers HV10 measurements. Quantitative verification of the effectiveness of the TBW technique was conducted, demonstrating positive microstructural changes and a reduction in crack formation in welded joints. Additionally, the proposed technique was found to decrease the hardness of S1300 steel joints, regardless of base material thickness.
Article
Chemistry, Physical
Hany S. Abdo, Asiful H. Seikh
Summary: This study investigated the impact of different process parameters on the ultimate tensile strength and microhardness of laser butt welding of S32520 duplex stainless steel. It was found that an increase in process parameters up to a certain level improved the tensile strength, but beyond that level the tensile strength decreased. This was attributed to insufficient heat energy delivery to the material, resulting in lower strength in the welded joint.
Article
Automation & Control Systems
Ivan Bunaziv, Cato Dorum, Steen Erik Nielsen, Pasi Suikkanen, Xiaobo Ren, Bard Nyhus, Magnus Eriksson, Odd M. Akselsen
Summary: The study focuses on the application of single-pass laser beam welding for steel components with wall thickness > 10 mm, investigating the causes and solutions of root humping. Experimental results show successful welding of different thickness plates under various process parameters, achieving good root quality by using a small air gap.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jacek Tomkow
Summary: Using hydrophobic coatings on electrodes can improve the weldability of HSLA steel in underwater conditions by reducing the hardness in the heat-affected zone and significantly reducing the number of cold cracks.
Article
Engineering, Mechanical
Lechoslaw Tuz
Summary: The article discusses the test results of damage to a fan impeller caused by improper welding process and welding imperfections. The failure to comply with welding technological regimes for high-strength steels joining led to not only the damage of the device but also significant damage to a fan room.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Construction & Building Technology
Lassi Keranen, Olli Nousiainen, Vahid Javaheri, Antti Kaijalainen, Aki-Petteri Pokka, Markku Keskitalo, Juhani Niskanen, Emil Kurvinen
Summary: The effects of welding heat input and operating temperature on the properties of welded ultrahigh-strength steel were studied, and a predictive model was proposed for designers to create safer engineering design solutions.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Engineering, Mechanical
Suresh Gain, Suman Kalyan Das, Dipankar Sanyal, Sanjib Kumar Acharyya
Summary: This study assesses the application of friction stir welding (FSW) for joining 316L stainless steel industrial grade pipes. The chosen welding parameters have significant influence on the metallurgical and mechanical properties of the welded joints, and the weld zone at the optimal combination of parameters exhibits higher tensile strength than the base metal.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Optics
Alireza Karimi, Arash Karimipour, Mohammad Akbari, Mohammad Mehdi Razzaghi, Mehdi Jamali Ghahderijani
Summary: In this study, laser welding of dissimilar A516 low carbon steel and duplex stainless steel was performed to investigate the influence of laser welding parameters on the mechanical properties and microstructure. The highest tensile strength of 500 MPa and 18% elongation were achieved with a laser power of 400 W, welding speed of 300 mm/min, and focal point. The microstructure of the fusion zone consisted of ferrite-austenite distribution from duplex stainless steel and fully martensitic structure from the A516 side.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Sameera J. Vaikar, Varun Narayanan, Joshy Chellathu George, T. C. Kanish, K. Devendranath Ramkumar
Summary: Pulsed direct current gas tungsten arc welding (GTAW) was used to weld 12 mm thick plates of naval, marine-grade high strength low alloy steel (HSLA) using ER80S-Ni3 filler metal. The microstructural analysis showed a mixed microstructure of acicular ferrite, polygonal ferrite, grain boundary ferrite, and bainite ferrite in the fusion zone. The PDCGTA weld joints exhibited superior yield and tensile strengths compared to the base metal, and a joint efficiency of 122% was observed during notch tensile studies. The impact toughness of the weld joints was higher than that of the base metal, and the formation of acicular ferrite and bainite ferrite contributed to better tensile and impact properties at room temperature. The joints also showed a transition from ductile to brittle fracture mode as the temperature decreased.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
P. Tatarko, S. Grasso, A. Kovalcikova, D. Medved', I. Dlouhy, M. J. Reece
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Ceramics
Gianmarco Taveri, Ondrej Hanzel, Jaroslav Sedlacek, Jaromir Tousek, Zuzana Nescakova, Martin Michalek, Ivo Dlouhy, Miroslav Hnatko
Summary: A new procedure was developed to consolidate Bioglass(R) 45S5 powder in water-based solutions, resulting in nearly fully dense samples with hydroxyapatite formation observed in simulated body fluid immersion. Analysis of microstructure and chemistry differences between the base material and dissolution product suggest potential applications of the densified Bioglass(R) in bio-engineering.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Igor Moravcik, Antonin Kubicek, Larissa Moravcikova-Gouvea, Ondrej Adam, Vaclav Kana, Vaclav Pouchly, Antonin Zadera, Ivo Dlouhy
Article
Materials Science, Ceramics
Monika Tatarkova, Peter Tatarko, Alexandra Kovalcikova, Ivo Dlouhy, Jan Dusza, Pavol Sajgalik
Summary: The addition of h-BN nanosheets during spark plasma sintering process improved the fracture toughness and strength of Si3N4, while slowing down the alpha -> beta phase transformation. Proper control of the particle size and content of h-BN nanosheets can effectively enhance the mechanical properties of Si3N4.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Igor Moravcik, Naeimeh Sadat Peighambardoust, Amir Motallebzadeh, Larissa Moravcikova-Gouvea, Chang Liu, J. Manoj Prabhakar, Ivo Dlouhy, Zhiming Li
Summary: The nitrogen-alloyed variant of the CoCrNi MEA exhibits higher corrosion resistance, while both nitrogen-free and nitrogen-doped MEAs show lower corrosion current and rates compared to 316L steel. The addition of nitrogen significantly improves the pitting corrosion resistance of CoCrNiN.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Luca Bertolla, Ivo Sulak, Jiri Bursik, Ivo Dlouhy, Jiri Smilek, Petra Macova, Jiri Holas
Summary: In this study, hexagonal boron nitride (h-BN) was successfully exfoliated into nanosheets using concentrated low-modulus water glass, resulting in a yield of nearly 30% BNNSs. The BNNSs obtained had lateral sizes of approximately 250 nm and narrow size distribution, aligning into parallel rows. High-resolution transmission electron microscopy (HR-TEM) analysis confirmed the integrity of exfoliated BNNSs preserved by water glass, leading to a high amount of undamaged structure BNNSs.
Article
Chemistry, Physical
Ondrej Hanzel, Zoltan Lences, Peter Tatarko, Richard Sedlak, Ivo Dlouhy, Jan Dusza, Pavol Sajgalik
Summary: Silicon carbide-based composites with graphene nanoplatelets were prepared in three and five layers to achieve high electrical conductivity, especially suitable for electric discharge machining. Increasing sintering pressure significantly improved the electrical conductivity of the composites, with a positive influence on individual layers with higher GNPs content. While there was a decrease in hardness and elastic modulus, the materials showed good adhesion between layers with no delamination observed in scratch tests.
Article
Chemistry, Physical
Jaroslav Pokluda, Ivo Dlouhy, Marta Kianicova, Jan Cupera, Jana Hornikova, Pavel Sandera
Summary: Experimental study shows that the strength level of low-alloyed steel OCHN3MFA can be enhanced from high to ultra-high levels under different heat treatment conditions, with improved tensile ductility characteristics and reduced inclusion content. However, the values of fracture toughness of all grades are found to be comparable in the entire temperature range due to high stress triaxiality, and the temperature dependence of fracture mechanisms differs between tensile and fracture-toughness tests.
Article
Chemistry, Physical
Sergiy Kotrechko, Vladislav Kozak, Oleksandra Zatsarna, Galyna Zimina, Nataliya Stetsenko, Ivo Dlouhy
Summary: The study demonstrates that consideration of the temperature and strain dependence of crack nucleus bulk density leads to the invariance of parameters of the Weibull distribution with temperature. The proposed microscopic model predicts the dependence of CN bulk density on plastic deformation value and temperature.
Article
Chemistry, Physical
Larissa Moravcikova-Gouvea, Igor Moravcik, Vaclav Pouchly, Zuzana Kovacova, Michael Kitzmantel, Erich Neubauer, Ivo Dlouhy
Summary: This study reports the microstructural evolution and mechanical properties of a low-density Al0.3NbTa0.8Ti1.5V0.2Zr refractory high-entropy alloy (RHEA) prepared by mechanical alloying and spark plasma sintering (SPS). Analysis of hardness, elastic constants, and phase diagrams suggest that 10 hours of milling is sufficient for achieving optimal microstructural homogeneity and refinement, high hardness, and minimal contamination in the sintered materials.
Article
Materials Science, Multidisciplinary
Igor Moravcik, Martin Zeleny, Antonin Dlouhy, Hynek Hadraba, Larissa Moravcikova-Gouvea, Pavel Papez, Ondrej Fikar, Ivo Dlouhy, Dierk Raabe, Zhiming Li
Summary: This study investigates the effects of interstitial nitrogen and carbon on the stacking fault energy (SFE) of an equiatomic Cobalt-Chromium-Nickel (CoCrNi) medium entropy alloy. The results show that both nitrogen and carbon in solid solution increase the SFE of the alloy, with nitrogen having a more significant effect. Additionally, the SFE of CoCrNi increases after doping with 0.5 atomic percent of interstitial nitrogen.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Hector A. Tinoco, Stanislava Fintova, Irma Heikkila, Diego Herrero, Taina Vuoristo, Ivo Dlouhy, Pavel Hutar
Summary: This study focused on characterizing three variants of microalloyed 38MnSiV6 steel in terms of microstructure, mechanical properties, and crack initiation. It was found that non-metallic inclusions in the steel had an impact on the mechanical properties, with MnS and MnSeS inclusions being responsible for strain localization and crack initiation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zoya Hadzhieva, Katarzyna Cholewa-Kowalska, Ivo Dlouhy, Tomasz Moskalewicz, Aldo R. Boccaccini
Summary: Coatings based on zein with the addition of bioactive glass particles doped with fluoride or a combination of fluoride and copper were deposited on titanium by electrophoretic deposition. The coatings showed improved scratch resistance and antibacterial activity, with no impact on bioactivity. These coatings have potential applications in orthopaedic and dental implants.
Proceedings Paper
Engineering, Mechanical
Peter Jurci, Jana Ptacinova, Ivo Dlouhy
Summary: This study investigates the fracture micro mechanism of cryogenically treated Cr-V ledeburitic tool steel using scanning electron microscopy and microanalysis. The research finds that small globular carbides produced by cryogenic treatments enhance ductility, while nano-scaled transient carbides within the martensite are more prone to cleavage cracking.
PROCEEDINGS OF THE 9TH INTERNATIONAL CONFERENCE ON FRACTURE, FATIGUE AND WEAR, FFW 2021
(2022)
Article
Materials Science, Multidisciplinary
Haris Rudianto, Sang Sun Yang, Yong Jin Kim, Ivo Dlouhy, Wahyu Caesarendra
JOURNAL OF METALS MATERIALS AND MINERALS
(2020)
