Tomasz Kurzynowski

Wroclaw University of Science and Technology | WUT · Faculty of Mechanical Engineering

The laser-based powder bed fusion of polymers (PBF-LB/P) process often utilizes a blend of powders with varying degrees of degradation. Specifically, for polyamide 12, the traditional reuse schema involves mixing post-processed powder with virgin powder at a predetermined ratio before reintroducing it to the process. Given that only about 15% of th...

The most important advantage of additive manufacturing by laser powder bed fusion (PBF-LB) technique is the ability to produce geometrically complex parts, but the problem is their rough surfaces, often difficult or inaccessible to finish by machining. Therefore, research to improve the reproducibility of the mechanical behavior of parts manufactur...

Purpose: This study investigated the influence of three types of metallic microfillers, spherical silver and spherical, and dendritic copper, on the ability of polyamide 12 (PA12) to inhibit microorganism growth on the surfaces of samples produced using laser-based powder bed fusion of polymers (PBF-LB/P). The aim of this study was to initially cha...

Citation: Bartczak, N.; Kowalczyk, J.; Tomala, R.; Stefanski, M.; Szymański, D.; Ptak, M.; Stręk, W.; Szustakiewicz, K.; Kurzynowski, T.; Szczepański, Ł.; et al. Effect of the Addition of Graphene Flakes on the Physical and Biological Properties of Composite Paints. Molecules 2023, 28, 6173. Abstract: In this study, graphene flakes were obtained us...

One of the main limitations of additive manufacturing (AM) technologies consists in the relatively low build rate. Low productivity discourages companies from investing in AM machines, thus limiting the market of additive technologies. Machine manufacturers have introduced new solutions to their designs to increase the build rate, some of them are...

Aluminium alloys have become increasingly popular in additive manufacturing (AM). However, casting is still the primary method of manufacturing bulk parts from aluminium alloys in the automotive industry. Therefore, understanding the differences between the alloys after casting and PBF-LB/M is crucial when considering the transition to digital manu...

Despite the significant potential advantages of processing Ti-5Al-5Mo-5V-1Cr-1Fe alloy (Ti-55511) using Electron Beam Melting (PBF-EB/M), when compared to conventional manufacturing technologies, the resulting internal defects are an important characteristic of such additive technologies and can highly decrease mechanical properties. One of the mos...

The article presents the results of ultrasonic testing of Ti6Al4V material produced by the conventional method and the laser bed fusion method. Modern manufacturing techniques, such as additive manufacturing, allow the production of parts with complex shapes. It is important to control the condition of such components throughout their lifetime. The...

Additive manufacturing (AM) is dynamically developing and finding applications in different industries. The quality of input material is a part of the process and of the final product quality. That is why understanding the influence of powder reuse on the properties of bulk specimens is crucial for ensuring the repeatable AM process chain. The pres...

In this paper, polyamide 12 (PA12) blends with three types of metallic fillers are tested, which differ in the type of material and its’ morphology. Low content mixtures are taken into consideration (0.5, 1.0, 2.0, 5.0 wt%), since a low impact on mechanical properties along with obtaining antibacterial properties are desired. The investigation focu...

Laser powder bed fusion (LPBF) enables additive manufacturing (AM) of complex three-dimensional objects. Inconel 718 is a widely used aerospace material and a material that has been well adopted for the LPBF process. However, when manufacturing geometrically complex Inconel 718 parts in the aerospace industry, some aspects of the LPBF processes sti...

Material models in the framework of continuum mechanics cover the experimentally observed phenomena with a mathematical representation and a correspondingsetofmaterialparameters,whichneedtobeestablishedandvalidated. The theory of viscoplasticity plays an important role to describe the material behaviour of polymers and metals for a conventional as...

Heat treatment of laser powder bed fused (LPBF-ed) Inconel 718 is crucial to achieve desired mechanical properties. Residual stresses, microsegregation, anisotropy, undesirable phases, layered structure, and poor surface quality are the challenges to be faced before LPBF-ed Inconel 718 parts can be industrially implemented. Although heat treatment...

The paper presents a detailed description of the method of carrying out static tensile tests in ex-situ X-ray computed tomography (XCT) conditions. The study compares samples manufactured with the use of additive technology in two orientations, horizontally and vertically, which correspond to the in-layer and between-layer sintering mechanisms. Bot...

A year after the first cases, the COVID-19 pandemic continued to put immense pressure on healthcare systems worldwide. With supply chains broken, the only opportunity for hospitals was to turn to unconventional solutions to overcome medical equipment shortages in the shortest possible time. This paper describes the methodology that allows the prepa...

In the era of the coronavirus pandemic, one of the most demanding areas was the supply of healthcare systems in essential Personal Protection Equipment (PPE), including face-shields and hands-free door openers. This need, impossible to fill by traditional manufacturing methods, was met by implementing of such emerging technologies as additive manuf...

Fe-based metallic glasses (MG) have become the subject of extensive research in recent years due to their favorable mechanical and magnetic properties. In particular, the production of this type of materials in Laser Powder Bed Fusion (LPBF), also known as Selective Laser Melting (SLM) technology, is a kind of breakthrough, as it has become possibl...

In this paper, a detailed assessment of Inconel 718 powder, with varying degrees of degradation due to repeated use in the Laser Powder Bed Fusion (LPBF) process, has been undertaken. Four states of IN718 powder (virgin, used, overflow and spatter) were characterized in terms of their morphology, flowability and physico-chemical properties. Studies...

Vacuum-pressure casting technology allows small batches of components to be manufactured from polymer materials, mainly from thermosetting plastics such as polyurethane and epoxy resins. Apart from being very simple, the process is also advantageous in that it offers a very accurately reproduced geometrical structure of the surfaces of master patte...

This paper presents the results of research on ballistic panels made of polymer–matrix composites (PMCs). The analysis covers two types of composites produced by the authors based on high-density polyethylene (PEHD) and polypropylene (PP) reinforced with aramid fabric. Ballistic tests were carried out with the use of two types of projectile: 0.38 S...

Graphene, a two-dimensional structure of carbon, due to its structure has unique physico-chemical properties that can be used in numerous research and industry areas. Although this structure is already well known, there are still technological (and cost) barriers which do not allow to produce this material in large quantities and hence prevent its...

Laser powder bed fusion (LPBF) is an attractive technology of manufacturing highstrength aluminium alloy parts for the aircraft and automobile industries, limited by poor processability of these alloys. This work was aimed at finding the process window for the LPBF manufacturing of defect-free components of AA7075 alloy. Optimization of the paramet...

The effect of electron-beam melting (EBM) and selective laser melting (SLM) processes on the chemical composition, phase composition, density, microstructure, and microhardness of as-built Ti55511 blocks were evaluated and compared. The work also aimed to understand how each process setting affects the powder characteristics after processing. Exper...

Selective Laser Melting (SLM) of magnesium alloys is the technology undergoing dynamic development in many research centres. The results are promising and make it possible to manufacture defect-free material with better properties than those offered by the manufacturing technologies used to date. This review aims to evaluate present state as well a...

W artykule przedstawiona została koncepcja sterowania poprzecznego bezzałogowym statkiem powietrznym (BSP) przy pomocy zaburzaczy warstwy przyściennej, opisana szerzej w pracy magisterskiej pt. „Badanie efektywności sterowania samolotem za pomocą wirów krawędziowych” [3]. Przeprowadzony został przegląd aktualnego stanu wiedzy w temacie sposobów gen...

Abstract Magnesium alloys are well known of its biocompatibility and biodegradable properties [1], [2] owing to the fact that magnesium is crucial mineral for human body, especially bone tissue. There are studies [3] on using WE43 additively manufactured magnesium scaffolds for full bony and soft tissue regeneration. Moreover, magnesium implants in...

Purpose This paper aims to discuss the results of material tests conducted on specimens manufactured from AZ31 alloy powder by selective laser melting (SLM) technology. The manufactured specimens were then subjected to porosity assessment, microstructure analysis as well as to mechanical and corrosion tests. Design/methodology/approach SLM process...

In the present study, a commercially pure (CP) Ti and Ti–Re alloys containing 2 and 4 wt% of Re were manufactured by selective laser melting (SLM) and characterized in terms of microstructure, strength and fatigue crack propagation resistance. On the contrary to a homogenous lath-type martensitic α′ microstructure with no signs of directional solid...

In this article, the authors discuss the results of studies into the processing of Ti-5Al-5Mo-5V-1Cr-1Fe near-β titanium alloy (Ti-55511) by electron beam melting (EBM), an additive manufacturing technique. Due to its high flexibility in shaping mechanical properties, Ti-55511 alloy is commonly used in aircraft components such as landing gear or ai...

This paper presents results on processing AZ31 magnesium alloy with Selective Laser Melting technology. The process optimization was performed according to the Design of Experiments methods. The porosity analysis shown that fully dense specimens were achieved. Thanks to the Analysis of Variance (ANOVA), the impact of changed parameters on the poros...

Standard experimental research works are aimed at optimization of Selective Laser Melting (SLM) parameters in order to produce material with relative density over 99% and possibly the highest scanning speed. Typically, cuboidal specimens with arbitrarily selected dimensions are built. An optimum set of parameters, determined on such specimens, is u...

Selective laser melting (SLM) is a fast growing, Additive Manufacturing (AM) technology, that creates opportunities for manufacturing complex geometries (both monolithic volumes and spatial structures) directly from metal powders and CAD 3D computer model. Therefore, the SLM technology is recognized as a manufacturing technology of the future. Many...

Selective laser melting (SLM) is a fast growing, Additive Manufacturing (AM) technology, that creates opportunities for manufacturing complex geometries (both monolithic volumes and spatial structures) directly from metal powders and CAD 3D computer model. Therefore, the SLM technology is recognized as a manufacturing technology of the future. Many...

Magnesium alloys are well known for their biocompatibility and biodegradable properties [9], [27] owing to the fact that magnesium is a mineral crucial for human body, especially for bone tissue. There are studies [17] on using WE43 additively manufactured magnesium scaffolds for full bone and soft tissue regeneration. Moreover, magnesium implants...

In this study, the effect of rhenium addition (2, 4, and 6 wt pct) and building orientation (0 and 90 deg) on the microstructure and corrosion resistance of Inconel 718 (IN718) alloy processed by selective laser melting (SLM) was investigated. Microstructure characterization showed that the as-built IN718-Re alloys consist of columnar grains growin...

Selective laser melting (SLM) is an additive manufacturing process that enables novel alloy production by combining metals with significantly different physical properties. In this paper, the hot corrosion behavior of Ti–Re alloys fabricated by SLM was studied in a mixture of Na2SO4 and NaCl salts at 600 °C. The morphology and composition of the co...

Nowadays, a CoCrMo alloy is widely used in medicine due to its high corrosion resistance and biotolerance. The possibility to change its mechanical properties (σt, σ0.2 and elongation ԑf) means a large extension of properties in accordance with the requirements of the end-user and could lead to an increase in the attractiveness of a CoCrMo alloy fo...

Nowadays, a CoCrMo alloy is widely used in medicine due to its high corrosion resistance and biotolerance. The possibility to change its mechanical properties means a large extension of properties in accordance with the requirements of the end-user and could lead to an increase in the attractiveness of a CoCrMo alloy for applications in other indus...

Selective laser melting of Inconel 718 (IN718) alloyed with rhenium is an attempt to increase high temperature properties of widely AMused nickel superalloy, without losing its processability. As SLM technology uses metal powders of very low fraction (usually 20-65 µm), the creation of new alloys is possible by mixing powders of alloy components wi...

High-density 316 L specimens were fabricated by selective laser melting (SLM). Different processing parameters, including laser power (100, 200 W) and scanning strategies (alternating stripes without and with re-melting after every layer) were employed to evaluate their impact on microstructure and texture of the specimens. Microstructures of the s...

Laser surface alloying (LSA) with rhenium was applied to produce wear and corrosion resistant layers on Inconel 718 alloy. Using a high-power diode laser and 50% overlapping ratio of laser tracks, two kinds of alloyed layers were produced: IN718–14 wt% Re layer with completely dissolved Re powder in substrate, and IN718–28 wt% Re layer with partial...

The role of rhenium in refractory metals and superalloys is well known. This study was performed to investigate the effect of rhenium in stainless steels. Results of al-loying rhenium into 316L alloy was done by consolidation of 316L and rhenium powders and processing of such prepared mixtures with the use of selective laser melting technology. The...

AISI H13 tool steel and selective laser melting technology is being successfully implemented for the production of injection moulds. Due to the complex geometry of injection moulds scanned cross sections has variable sizes. It is therefore important to develop variable parameters allowing to produce parts with a different distribution of scan field...

The paper presents the results of the process development of laser surface modification of commercially pure titanium with rhenium. The criterion of the successful/optimal process is the repetitive geometry of the surface, characterized by predictable and repetitive chemical composition over its entire surface as well as special mechanical properti...

The SLM process offers considerable set of advantages in comparison to traditional manufacturing techniques, like low material consumption or possibility to manufacture complex parts. These characteristic qualify SLM process for aerospace applications. Four orientations (0°, 45°, 45°x45° and 90° - in relation to the building direction) of high dens...

Selective Laser Melting allows building structures of unique and complex shape. Nowadays, the technology is successfully applied in the production of components of titanium-, cobalt-chromium and nickel alloys. However, the range of available materials continues to grow. Tungsten could be such a novel material for powder-bed technologies. The produc...

Biocomposite (or bioceramic) materials have become very popular, especially for replacing some human bone parts, such as hip joints, knee joints, and producing implants for dentistry and others. It is supposed that cladding coatings with hydroxyapatite (HA) on a metallic substrate could be a good solution for implants. Production of laser cladding...

Microstructural and mechanical properties of Inconel 718 were determined on the specimens manufactured by selective laser melting (SLM) of prealloyed powder. High density (99.8%) cylindrical specimens were built with four orientations (0°, 45 °, 45°×45° and 90°) in relation to the building and scanning directions. Because of directional, dendritic-...

The paper presents results of processing Ti–Re alloys by consolidating mixtures of powders of both metals with the use of selective laser melting (SLM). Ti-based alloys containing 0.5, 1.0 and 1.5 at% Re were obtained in this way. Optimum process parameters were determined by accepting the criterion of minimum porosity of manufactured parts and max...

Mini-samples technique was utilized to determine mechanical properties of technically pure titanium produced by means of selective laser melting (SLM). Full-field digital image correlation (DIC) measurements and inverse method were applied for crack tip position and stress intensity factors calculations in the case of fatigue crack growth rate t...

The paper presents the possibility of using reverse engineering in forensic science. Available reverse engineering technologies and examples of their use as a helpful forensic research tool are reviewed. A method of reconstruction of objects using computed tomography technology was described, as well as an example of the application of this method...

PURPOSE: Bacterial colonization of the denuded bone in bisphosphonate-related osteonecrosis of the jaw suggests that bisphosphonates increase bacterial adhesion and biofilm formation. This study evaluated the adhesion of gram-positive and gram-negative bacteria on hydroxyapatite coated with pamidronate, one of the most potent bisphosphonates. MATER...

The paper presents results of studies on Selective Laser Melting. SLM is an additive manufacturing technology which may be used to process almost all metallic materials in the form of powder. Types of energy emission sources, mainly fiber lasers and/or Nd:YAG laser with similar characteristics and the wavelength of 1,06 - 1,08 microns, are provided...

Selective laser melting (SLM) is an advanced manufacturing technology providing alternative method of producing complex components directly from 3D computer models. The purpose of this work is to determine the influence of the SLM manufacturing strategy on mechanical properties and microstructure of the as-built Ti-Al-Nb alloy. Specimens of Ti-6Al-...