Fernando Warchomicka
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View article: Solution-based synthesis of nanocrystalline KBiS <sub>2</sub> films at low temperatures and study of photoinduced charge generation
Solution-based synthesis of nanocrystalline KBiS <sub>2</sub> films at low temperatures and study of photoinduced charge generation Open
We prepared rhombohedral and cubic KBiS 2 thin films under mild conditions and demonstrated the formation of oxygen centered radicals along with an excellent charge carrier lifetime upon irradiation.
View article: Analysis of Nonuniform Deformation in Aluminum Wires Under Varying Torsional Loads Using EBSD Measurement and Multiscale Crystal Plasticity
Analysis of Nonuniform Deformation in Aluminum Wires Under Varying Torsional Loads Using EBSD Measurement and Multiscale Crystal Plasticity Open
Computational crystal plasticity (CP) models are widely utilized in the literature to analyze the deformation responses of materials at the microstructural level under macroscopic loading conditions. The challenge of connecting changes in …
View article: In situ alloying of AlCuSi using dual-wire-directed energy deposition with plasma
In situ alloying of AlCuSi using dual-wire-directed energy deposition with plasma Open
The current research explores additive manufacturing of a multi-phase material using dual-wire plasma-directed energy deposition technology. With this approach, new materials can be designed and tested easily on the basis of commercially a…
View article: Stress-induced phase transformations in Ti-15Mo alloy at elevated temperature
Stress-induced phase transformations in Ti-15Mo alloy at elevated temperature Open
Controlled mechanical loading was applied to Ti-15Mo alloy during annealing at 550 $^\circ$C. Massive formation of the $ω_{\textrm{iso}}$ phase from the parent $β$-phase occurred during annealing at 550 $^\circ$C without external stress or…
View article: Zirconium Oxide as a Novel Material for Post-Endodontically Treated Teeth: Comparative Fracture Behavior of 3D-Printed Cobalt–Chromium, Milled Zirconium Oxide, and Quartz Fiber Posts
Zirconium Oxide as a Novel Material for Post-Endodontically Treated Teeth: Comparative Fracture Behavior of 3D-Printed Cobalt–Chromium, Milled Zirconium Oxide, and Quartz Fiber Posts Open
This study evaluates the mechanical properties of materials used in the post-endodontic restoration of root-treated teeth and examines their performance under stress to provide insights for material selection in clinical applications. Part…
View article: Heterogeneous dynamic restoration of Ti–15Mo alloy during hot compression
Heterogeneous dynamic restoration of Ti–15Mo alloy during hot compression Open
Near-beta titanium alloys have shown low Young's modulus and good strength,\nmaking them excellent implant candidates. However, their processing using\nthermomechanical routes in single phase beta region results in heterogeneous\nmicrostru…
View article: Thermal cycling effects on the local microstructure and mechanical properties in wire-based directed energy deposition of nickel-based superalloy
Thermal cycling effects on the local microstructure and mechanical properties in wire-based directed energy deposition of nickel-based superalloy Open
In additive manufacturing, intrinsic heat treatments take place during deposition that affect the properties of AM-structures. In this work, the influence of thermal cycling on the local microstructure and mechanical properties of nickel-b…
View article: The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds
The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds Open
Grain refinement by plastic deformation during conventional TIG welding can help to compensate for the loss of mechanical properties of welded joints. The thermomechanical welding (TMW) tests were performed on S700MC steel with different c…
View article: Welding of S1100 Ultra high‐Strength Steel Plates with Matching Metal‐Cored Filler Wire: Microstructure, Residual Stresses, and Mechanical Properties
Welding of S1100 Ultra high‐Strength Steel Plates with Matching Metal‐Cored Filler Wire: Microstructure, Residual Stresses, and Mechanical Properties Open
This study investigates the relationship between the microstructure and the mechanical properties and the residual stresses of thermomechanically rolled, butt‐welded S1100MC ultra high‐strength steel plates. Matching metal‐cored filler wir…
View article: ZnIn<sub>2</sub>S<sub>4</sub> thin films with hierarchical porosity for photocatalysis
ZnIn<sub>2</sub>S<sub>4</sub> thin films with hierarchical porosity for photocatalysis Open
A solution-based route towards hierarchically porous ZnIn 2 S 4 photocatalyst films combining macropores (300 nm), and nanopores (1.6 nm) is presented.
View article: The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds
The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds Open
Grain refinement by plastic deformation attempts to compensate for the loss of mechanical properties of welded joints during conventional TIG welding. We performed thermomechanical welding (TMW) tests on the S700MC steel with welding combi…
View article: Influence of process and heat input on the microstructure and mechanical properties in wire arc additive manufacturing of hot work tool steels
Influence of process and heat input on the microstructure and mechanical properties in wire arc additive manufacturing of hot work tool steels Open
The present study demonstrates the suitability of wire arc additive manufacturing (AM) for hot work tool steel processing. Different arc welding techniques and energy inputs were applied and systematically compared to determine the deposit…
View article: Solution-Processable Cu<sub>3</sub>BiS<sub>3</sub> Thin Films: Growth Process Insights and Increased Charge Generation Properties by Interface Modification
Solution-Processable Cu<sub>3</sub>BiS<sub>3</sub> Thin Films: Growth Process Insights and Increased Charge Generation Properties by Interface Modification Open
Cu3BiS3 thin films are fabricated via spin coating of precursor solutions containing copper and bismuth xanthates onto planar glass substrates or mesoporous metal oxide scaffolds followed by annealing at 300 °C to convert the metal xanthat…
View article: Analysis of modified surface topographies of titanium-based hip implants using finite element method
Analysis of modified surface topographies of titanium-based hip implants using finite element method Open
BACKGROUND: In order to ensure the proper function of the cementless hip implant, the connection between the femoral bone and the implant has to be as strong as possible. According to experimental studies, implants with a rough surface red…
View article: High Temperature Tensile Strength of TI6AL4V Processed by L-PBF—Influence of Microstructure and Heat Treatment
High Temperature Tensile Strength of TI6AL4V Processed by L-PBF—Influence of Microstructure and Heat Treatment Open
Ti6Al4V is the most widely used α‑β Titanium alloy for application in medicine, automotive, and aerospace, known for its high strength and corrosion resistance, but also its high maximal operating temperature of around 420 °C. Combined wit…
View article: Toward a sustainable laser powder bed fusion of Ti 6Al 4 V: Powder reuse and its effects on material properties during a single batch regime
Toward a sustainable laser powder bed fusion of Ti 6Al 4 V: Powder reuse and its effects on material properties during a single batch regime Open
Titanium alloy Ti6Al4V is the most used titanium alloy due to its high specific strength, ductility, corrosion resistance, and weldability. Currently, this alloy is produced with a density above 99% with laser welding-based additive manufa…
View article: Combination of Electron Beam Surface Structuring and Plasma Electrolytic Oxidation for Advanced Surface Modification of Ti6Al4V Alloy
Combination of Electron Beam Surface Structuring and Plasma Electrolytic Oxidation for Advanced Surface Modification of Ti6Al4V Alloy Open
The objective of this work is to study for the first time the combination of electron beam (EB) surface structuring and plasma electrolytic oxidation (PEO) with the aim of providing a multiscale topography and bioactive surface to the Ti6A…
View article: Influence of powder production process and properties on material properties of Ti6Al4V manufactured by L-PBF
Influence of powder production process and properties on material properties of Ti6Al4V manufactured by L-PBF Open
Besides process parameters, powder properties such as grain size, morphology, and chemical composition have the highest impact on the material properties of parts produced by powder-based additive manufacturing. These properties are strong…
View article: Resistance of Quench and Partitioned Steels Against Hydrogen Embrittlement
Resistance of Quench and Partitioned Steels Against Hydrogen Embrittlement Open
Multiphase ultra-high strength steels (UHSS) containing retained austenite (RA) appear to be among the most interesting steels for the automotive industry. Developments in the last decades have allowed obtaining a very good combination of …
View article: Influence of Powder Production Process and Properties on Material Properties of Ti 6Al 4V Manufactured by L-PBF
Influence of Powder Production Process and Properties on Material Properties of Ti 6Al 4V Manufactured by L-PBF Open
Besides process parameters, powder properties such as grain size, morphology and chemical composition have the highest impact on material properties of parts produced by powder based additive manufacturing. These properties are strongly in…
View article: Influences of Surface, Heat Treatment, and Print Orientation on the Anisotropy of the Mechanical Properties and the Impact Strength of Ti 6Al 4V Processed by Laser Powder Bed Fusion
Influences of Surface, Heat Treatment, and Print Orientation on the Anisotropy of the Mechanical Properties and the Impact Strength of Ti 6Al 4V Processed by Laser Powder Bed Fusion Open
The scope of this work is to provide an overview of the influences of process parameters, print orientation, and post-process treatments of Ti6AlV4 processed by laser powder bed fusion on its microstructure and physical and mechanical prop…
View article: Wire-based electron beam additive manufacturing of tungsten
Wire-based electron beam additive manufacturing of tungsten Open
In present study, the feasibility of wire-based additive manufacturing of commercially pure tungsten using electron beam technique could be demonstrated. Three different representative volumetric AM structures were built and subsequently c…