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  • 1.
    Belov, Ilja
    et al.
    Jönköping University, Sweden.
    Zanella, Caterina
    RISE, SP – Sveriges Tekniska Forskningsinstitut. Jönköping University, Sweden; University of Trento, Italy.
    Edström, Curt
    Jönköping University, Sweden.
    Leisner, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut. Jönköping University, Sweden.
    Finite element modeling of silver electrodeposition for evaluation of thickness distribution on complex geometries2016In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 90, p. 693-703Article in journal (Refereed)
    Abstract [en]

    The paper reveals benefits of multi-disciplinary computer simulation and parametric studies in the design of silver plating process for improved coating distribution. A finite element model of direct current silver plating is experimentally validated for an Assaf panel without agitation. The model combines tertiary current distribution with Butler-Volmer electrode kinetics and computational fluid dynamics at a very low flow-rate. The effect of charge transfer coefficients on the throwing power of the process is quantified for the studied geometry, and variation of cathodic current density and exchange current density is investigated. A simpler model based on secondary current distribution is employed to quantify the effect of electrolyte conductivity on the throwing power of the process. A model combining tertiary current distribution and computational fluid dynamics has been developed and experimentally validated for simulation of complex telecom component electroplating in agitated electrolyte. The effect of current density on the process throwing power is quantified. Recommendations regarding modeling methodology and the effect of electrochemical and process parameters on the thickness distribution have been developed.

  • 2.
    Hosseini, Vahid
    et al.
    University West, Sweden; Innovatum AB, Sweden.
    Wessman, Sten
    RISE, Swerea, KIMAB. RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB. University West, Sweden.
    Hurtig, Kjell
    University West, Sweden.
    Karlsson, Leif
    University West, Sweden.
    Nitrogen loss and effects on microstructure in multipass TIG welding of a super duplex stainless steel2016In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 98, p. 88-97Article in journal (Refereed)
    Abstract [en]

    Nitrogen loss is an important phenomenon in welding of super duplex stainless steels. In this study, a super duplex stainless steel was autogenously TIG-welded with one to four bead-on-plate passes with low or high heat inputs using pure argon shielding gas. The goal was to monitor nitrogen content and microstructure for each weld pass. Nitrogen content, measured by wavelength dispersive X-ray spectrometry, was after four passes reduced from 0.28 wt% in the base metal to 0.17 wt% and 0.10 wt% in low and high heat input samples, respectively. Nitrogen loss resulted in a more ferritic structure with larger grains and nitride precipitates. The ferrite grain width markedly increased with increasing number of passes and heat input. Ferrite content increased from 55% in base metal to 75% at low and 79% at high heat inputs after four passes. An increasing amount of nitrides were seen with increasing number of weld passes. An equation was suggested for calculation of the final nitrogen content of the weld metal as functions of initial nitrogen content and arc energy. Acceptable ferrite contents were seen for one or two passes. The recommendation is to use nitrogen in shielding gas and proper filler metals.

  • 3.
    Karimi, Paria
    et al.
    University West, Sweden.
    Sadeghi, Esmail
    University West, Sweden.
    Åkerfeldt, Pia
    Luleå University of Technology, Sweden.
    Ålgårdh, Joakim
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB. University West, Sweden.
    Andersson, Joel
    University West, Sweden.
    Influence of successive thermal cycling on microstructure evolution of EBM-manufactured alloy 718 in track-by-track and layer-by-layer design2018In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 160, p. 427-441Article in journal (Refereed)
    Abstract [en]

    Successive thermal cycling (STC) during multi-track and multi-layer manufacturing of Alloy 718 using electron beam melting (EBM) process leads to a microstructure with a high degree of complexity. In the present study, a detailed microstructural study of EBM-manufactured Alloy 718 was conducted by producing samples in shapes from one single track and single wall to 3D samples with maximum 10 longitudinal tracks and 50 vertical layers. The relationship between STC, solidification microstructure, interdendritic segregation, phase precipitation (MC, δ-phase), and hardness was investigated. Cooling rates (liquid-to-solid and solid-to-solid state) was estimated by measuring primary dendrite arm spacing (PDAS) and showed an increased cooling rate at the bottom compared to the top of the multi-layer samples. Thus, microstructure gradient was identified along the build direction. Moreover, extensive formation of solidification micro-constituents including MC-type carbides, induced by micro-segregation, was observed in all the samples. The electron backscatter diffraction (EBSD) technique showed a high textured structure in 〈001〉 direction with a few grains misoriented at the surface of all samples. Finer microstructure and possibility of more γ″ phase precipitation at the bottom of the samples resulted in slightly higher (~11%) hardness values compared to top of the samples.

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  • 4.
    Köhnlein, Maximilian
    et al.
    University of Borås, Sweden.
    Abitbol, Tiffany
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Osório Oliveira, Ana
    Karolinska Institute, Sweden.
    Magnusson, Mikael
    RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
    Adolfsson, Karin
    KTH Royal Institute of Technology, Sweden.
    Svensson, Sofie
    University of Borås, Sweden.
    Ferreira, Jorge
    University of Borås, Sweden.
    Hakkarainen, Minna
    KTH Royal Institute of Technology, Sweden.
    Zamani, Akram
    University of Borås, Sweden.
    Bioconversion of food waste to biocompatible wet-laid fungal films2022In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 216, article id 110534Article in journal (Refereed)
    Abstract [en]

    The fungus Rhizopus delemar was grown on bread waste in a submerged cultivation process and wet-laid into films. Alkali or enzyme treatments were used to isolate the fungal cell wall. A heat treatment was also applied to deactivate biological activity of the fungus. Homogenization of fungal biomass was done by an iterative ultrafine grinding process. Finally, the biomass was cast into films by a wet-laid process. Ultrafine grinding resulted in densification of the films. Fungal films showed tensile strengths of up to 18.1 MPa, a Young's modulus of 2.3 GPa and a strain at break of 1.4%. Highest tensile strength was achieved using alkali treatment, with SEM analysis showing a dense and highly organized structure. In contrast, less organized structures were obtained using enzymatic or heat treatments. A cell viability assay and fluorescent staining confirmed the biocompatibility of the films. A promising route for food waste valorization to sustainable fungal wet-laid films was established. © 2022 The Authors

  • 5.
    Lindberg, Siv
    et al.
    RISE, Innventia.
    Roos, Anders
    SLU Swedish University of Agricultural Sciences, Sweden.
    Kihlstedt, Annika
    RISE, Innventia. RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Lindström, Mikael
    RISE, Innventia.
    A product semantic study of the influence of the sense of touch on the evaluation of wood-based materials2013In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 52, p. 300-307Article in journal (Refereed)
    Abstract [en]

    Based on product semantics, this study investigated how the tactile attributes of wood and wood-based composites are perceived and interpreted semantically. The wood-based samples included ash, birch, elm, oak, pine, OSB (oriented strand board), two wood pulp-reinforced polylactide composites, Comp A and B and one wood-fiber reinforced polypropene composite, Comp C. The subjects rated the samples by the descriptive words natural, exclusive, eco-. friendly, rough, inexpensive, reliable, warm, modern, snug and solid. The most significant differences between the samples were found for roughness and for the descriptors, reliable, natural and solid. A principal component analysis yielded three attributes based on the tactile perceptions: reliable, old-. fashioned and smooth. The solid wood pieces were perceived as natural and oak was perceived as being exclusive. The composite materials presented a greater variation in terms of perceived attributes than the wood specimens.

  • 6.
    Lungu, Adriana
    et al.
    University Politehnica of Bucharest, Romania.
    Cernencu, Alexandra
    University Politehnica of Bucharest, Romania.
    Dinescu, Sorina
    University of Bucharest, Romania.
    Balahura, Roxana
    University of Bucharest, Romania.
    Mereuta, Paul
    National Institute for Physics and Nuclear Engineering, Romania.
    Costache, Marieta
    University of Bucharest, Romania.
    Syverud, Kristin
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. NTNU Norwegian University of Science and Technology, Norway.
    Stancu, Izabela
    University Politehnica of Bucharest, Romania.
    Iovu, Horia
    Academy of Romanian Scientists, Romania; University Politehnica of Bucharest, Romania.
    Nanocellulose-enriched hydrocolloid-based hydrogels designed using a Ca2+ free strategy based on citric acid2021In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 197, article id 109200Article in journal (Refereed)
    Abstract [en]

    In this work fully biomass-based hydrogels were developed using a naturally occurring vegetable hydrocolloid co-mingled with wood-derived nanocellulose fibrils. Two distinct types of hydrocolloids have been considered: a seaweed-derived biopolymer (alginate) and a plant-derived biopolymer (pectin). To attain nano-structured binary hydrogels, surface-functionalized cellulose nanofibrils (CNFs) bearing carboxyl groups were employed. This study addresses a non-conventional approach of physical gelation that takes place in acidic conditions (pH < 3) at ambiental temperature using citric acid as gelation-inducing additive in comparison with the typical Ca2+-crosslinked hydrogels. The use of a specific crosslinker directly determines the gross properties of the material because of different type and density of polymer junctions and chains assembly. Therefore, the final features of the bioinspired scaffolds such as moisture uptake, morphological and mechanical characteristics are strongly influenced by the type of gelling additive used and by the ratio between the employed vegetal polysaccharides. Citric acid-based hydrogels presented a higher stability when compared to the calcium-mediated controls and a significantly higher proliferation was detected when raising the hydrocolloid content and when citric acid was used for crosslinking. The newly adopted crosslinking strategy provides a more cell-interactive microenvironment than calcium-based crosslinking leading to improved viability and cytoskeleton development of stem cells. 

  • 7.
    Pant, Prabhat
    et al.
    Linköping University, Sweden.
    Salvemini, Filomena
    ANSTO, Australia.
    Proper, Sebastian
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
    Luzin, Vladimir
    ANSTO, Australia; University of Newcastle, Australia.
    Simonsson, Kjell
    Linköping University, Sweden.
    Sjöström, Sören
    Linköping University, Sweden.
    Hosseini, Seyed
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
    Peng, Ru Lin
    Linköping University, Sweden.
    Moverare, Johan
    Linköping University, Sweden.
    A study of the influence of novel scan strategies on residual stress and microstructure of L-shaped LPBF IN718 samples2022In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 214, article id 110386Article in journal (Refereed)
    Abstract [en]

    Process parameters in laser-based powder bed fusion (LBPF) play a vital role in the part quality. In the current study, the influence of different novel scan strategies on residual stress, porosities, microstructure, and crystallographic texture has been investigated for complex L-shape parts made from nickel-based superalloy Inconel 718 (IN718). Four different novel scanning strategies representing total fill, re-melting, and two different sectional scanning strategies, were investigated using neutron diffraction, neutron imaging, and scanning electron microscopy techniques. These results were compared with the corresponding results for an L-shape sample printed with the conventional strategy used for achieving high density and more uniform crystallographic texture. Among these investigated novel strategies, the re-melting strategy yielded approximately a 25% reduction in surface residual stress in comparison to the reference sample. The other two sectional scanning strategies revealed porosities at the interfaces of the sections and due to these lower levels of residual stress were also observed. Also, variation in crystallographic texture was observed with different scan strategies. © 2022 The Author(s)

  • 8.
    Velea, Marian Nicolae
    et al.
    Transilvania University of Brasov, Romania.
    Schneider, C.
    KTH Royal Institute of Technology, Sweden.
    Lache, Simona
    RISE, Swerea.
    Second order hierarchical sandwich structure made of self-reinforced polymers by means of a continuous folding process2016In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 102, p. 313-320Article in journal (Refereed)
    Abstract [en]

    One typical way to obtain higher stiffness and strength to weight ratios within structural applications is to use sandwich structures containing lightweight cellular cores. In this study a novel second order hierarchical sandwich structure and its manufacturing principle are described. The whole hierarchical structure is made of a fully recyclable material - different forms of poly-ethylene terephthalate (PET): PET matrix, reinforced with PET fibres (Self reinforced - SrPET) and PET foam resulting in a recyclable structure. The manufacturing path is developed such that it can be implemented within a continuous production line. Out-of-plane compression test are carried out in order to determine the stiffness and strength properties of the proposed structure. An analytical model is developed for evaluating the out-of-plane stiffness and strength properties and used for investigating the influence of the geometric parameters on the structural performance of the proposed hierarchical sandwich structure

  • 9.
    Yin, Haiyan
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health. KTH Royal Institute of Technology, Sweden.
    Sedighi Moghaddam, Maziar
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Tuominen, Mikko
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Eriksson, Mimmi
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. KTH Royal Institute of Technology, Sweden.
    Järn, Mikael
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Dėdinaitė, Andra
    RISE Research Institutes of Sweden. KTH Royal Institute of Technology, Sweden.
    Wålinder, Magnus
    KTH Royal Institute of Technology, Sweden.
    Swerin, Agne
    KTH Royal Institute of Technology, Sweden.
    Superamphiphobic plastrons on wood and their effects on liquid repellence2020In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 195, article id 108974Article in journal (Refereed)
    Abstract [en]

    The increasing utilization of wood-based products raises new demands for improved durability, for example an enhanced liquid repellence. Superhydrophobic or superamphiphobic surfaces have been widely fabricated. Less attention has been paid to such modifications on wood and the changes of its hygroscopic or solvoscopic properties. In this work, wood veneers were surface modified by hydrophobized silicone nanofilaments. Results revealed that the surface-modified wood showed a superamphiphobic behavior, i.e. it repelled water, ethylene glycol and hexadecane with contact angles greater than 150° and roll-off angles of less than 10°. Most importantly, a plastron effect was observed when the surface-modified wood was submerged in water, ethylene glycol or hexadecane, which reduced the liquid sorption rate and extent to various degrees. By comparing the measured permeabilities and the estimated diffusive mass flux and supported by Hansen solubility parameters and the degrees of swelling, it is concluded that diffusion is the major cause for the liquid uptake in the surface-modified wood. Moreover, the interaction between the liquid and the modified layer (the solubility of the liquid in the modified layer) also needs to be considered, especially in hexadecane. © 2020 The Authors

  • 10.
    Čapek, J.
    et al.
    Paul Scherrer Institute, Switzerland.
    Polatidis, E.
    Paul Scherrer Institute, Switzerland.
    Casati, N.
    Paul Scherrer Institute, Switzerland.
    Pederson, R.
    University West, Sweden.
    Lyphout, Christophe
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
    Strobl, M.
    Paul Scherrer Institute, Switzerland.
    Influence of laser powder bed fusion scanning pattern on residual stress and microstructure of alloy 7182022In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 221, article id 110983Article in journal (Refereed)
    Abstract [en]

    A comprehensive investigation is undertaken on the effect of laser scanning pattern on the microstructure of cylindrical samples made of Alloy 718 processed by Laser Powder Bed Fusion. It is observed that the common alternate direction scanning of the laser results in a more homogeneous microstructure than the less common concentric line scans where significant microstructural heterogeneities are seen between the edges and the center of the sample. The investigation focuses on the precipitation, crystallographic texture, grain size, grain morphology and residual stresses utilizing synchrotron X-ray diffraction, neutron diffraction and electron microscopy. The heterogeneous microstructure of the sample processed with the concentric laser pattern influences the chemical composition of the matrix, which alters the reference “strain free” interplanar spacing used for evaluating the residual strain. The investigation underlines the significance of the processing parameters on the homogeneity of the microstructure and the effect of the chemical variations on the determination of residual stresses in materials such as Alloy 718, where strong local chemical variations occur because of different types and extent of precipitation. © 2022

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