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Two Innovative Frameworks for Microstructural Simulation: The High-Driving-Force Phase-Field Model and Molecular Statistics Defect Characterization Framework KU Leuven

Vincent Feyen
Additive manufacturing (AM) has revolutionized the production of metal parts, offering unparalleled flexibility in design and efficiency in material use, thereby facilitating lightweight structural applications and minimizing waste. This innovation, however, diverges significantly from traditional manufacturing methods such as casting, primarily due to the extreme cooling rates that affect the microstructure and, consequently, the material ...

Effect of microstructural defects on passive layer properties of interstitial free (IF) ferritic steels in alkaline environment Vrije Universiteit Brussel

A Yilmaz, K Traka, Sven Pletincx, Tom Hauffman, J. Sietsma, Yaiza Gonzalez-Garcia

The role of microstructural defects (dislocation density and grain boundary areas) on the passive film properties formed on cold- and hot-rolled interstitial free (IF) steels is investigated in 0.1 M NaOH solution. Electron backscattered diffraction (EBSD) shows higher microstructural defect density on cold-rolled samples. Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) results exhibit the lower barrier ...

Transmission electron microscopy study of microstructural evolution in nanograined Ni-Ti microwires heat treated by electric pulse University of Antwerp

Rémi Delville, Benoît Malard, Jan Pilch, Petr Sittner, Nick Schryvers
Transmission electron microscopy and mechanical testing were employed to investigate the evolution of microstructure and functional superelastic properties of 0.1mm diameter as-drawn Ni-Ti wires subjected to a non-conventional heat treatment by controlled electric pulse current. This method enables a finer control of the recovery and recrystallisation processes taking place during the heat treatment and accordingly a better control on the final ...

Enhanced electrochemical performance of Li-rich cathode materials through microstructural control University of Antwerp

Jon Serrano-Sevillano, Marine Reynaud, Amaia Saracibar, Thomas Altantzis, Sara Bals, Staf Van Tendeloo, Montse Casas-Cabanas
The microstructural complexity of Li-rich cathode materials has so far hampered understanding the critical link between size, morphology and structural defects with both capacity and voltage fadings that this family of materials exhibits. Li2MnO3 is used here as a model material to extract reliable structure-property relationships that can be further exploited for the development of high-performing and long-lasting Li-rich oxides. A series of ...

Enhanced flux pinning isotropy by tuned nanosized defect network in superconducting YBa2Cu3O6+x films Ghent University

Mukarram Zaman Khan, Elmeri Rivasto, Jussi Tikkanen, Hannes Rijckaert, Mika Malmivirta, Maciej Oskar Liedke, Maik Butterling, Andreas Wagner, Hannu Huhtinen, Isabel Van Driessche, et al.
Striving to improve the critical current density Jc of superconductingYBa(2)Cu(3)O(6+x) (YBCO) thin films via enhanced vortex pinning, the interplay between film growth mechanisms and the formation of nanosized defects, both natural and artificial, is systematically studied in undoped and BaZrO3 (BZO)-doped YBCO thin films. The films were grown via pulsed laser deposition (PLD), varying the crystal grain size of the targets in addition to the ...

Mechanism of alteration in passivity of additively manufactured Ni-Fe-Cr Alloy 718 caused by minor carbon variation Vrije Universiteit Brussel

Arshad Yazdanpanah, Gioele Pagot, Mattia Franceschi, Pietro Rebesan, Mattia Venturin, Julia Botinha, Bodo Gerhmann, Iris De Graeve, Vito Di Noto, Reynier I. Revilla, et al.

Unlike conventional alloys, where carbon content typically promotes carbide compound formation and reduces localized corrosion resistance, the impact of carbon in additively manufactured materials remains largely unexplored due to rapid cooling rates inhibiting carbide formation. This study addresses the novel question of whether reducing carbon content benefits corrosion performance and its underlying mechanisms in Ni-Fe-Cr-based alloy 718. ...

X-ray CT to detect internal structures in apple fruit. From high-resolution 3D microstructure imaging towards fast screening tools KU Leuven

Els Herremans
Pome fruit is often stored up to 10 months at a low temperature (-0.5 ° C to 3 ° C), in combination with reduced O2 and elevated CO2 partial pressures. Storage at low temperature, combined with 'Controlled Atmosphere' (CA) is used to reduce the respiration activity of the fruit thereby minimising the associated quality changes, and thus extending the storage time. The gas composition is of great importance as physiological defects like internal ...

High-density tungsten fabricated by selective laser melting: Densification, microstructure, mechanical and thermal performance KU Leuven

shoufeng Yang
© 2019 Elsevier Ltd High-density pure tungsten (W) fabricated by selective laser melting (SLM) has been considered as a substantial challenge due to its high melting point of 3410 °C. In this study, near fully dense W samples with a relative density of 98.71% were obtained for the first time through a series of optimization experiments during the SLM process. The characteristics of the surface and the formation mechanism of the micro defects ...

Effect of high flux plasma exposure on the micro-structural and mechanical properties of ITER specification tungsten Ghent University

Andrii Dubinko, D Terentyev, Anastasiia Bakaeva, T Pardoen, Mikhail Zibrov, TW Morgan
We have performed a combined study using transmission electron microscopy (TEM), nuclear reaction analysis (NRA) and nano-indentation (NI) techniques to reveal the impact of high flux plasma exposure on the properties of a sub-surface region of the commercially available pure tungsten fabricated following the ITER specification. TEM examination revealed the formation of a dense dislocation network and dislocation tangles, resulting in a strong ...

Microscopic investigation of as built and hot isostatic pressed Hastelloy X processed by Selective Laser Melting University of Antwerp KU Leuven

Saeid Pourbabak, Maria L. Montero-Sistiaga, Nick Schryvers, Jan Van Humbeeck, Kim Vanmeensel
Microstructural characteristics of Hastelloy X produced by Selective Laser Melting have been investigated by various microscopic techniques in the as built (AB) condition and after hot isostatic pressing (HIP). At sub-grain level the AB material consists of columnar high density dislocation cells while the HIP sample consists of columnar sub-grains with lower dislocation density that originate from the original dislocation cells, contradicting ...