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Galán Argumedo, J.L. (author), Mahmoudiniya, M. (author), Reinton, T.E. (author), Kestens, L.A.I. (author), Hermans, M.J.M. (author), Popovich, V. (author)This study examines the interface layer between a high-strength low-alloy steel and an overlaying austenitic stainless steel as deposited through wire arc additive manufacturing in a bi-metal block. By utilizing optical and electron microscopy techniques, and accompanied by phenomenological and thermodynamic modeling, the work elucidates on...journal article 2024
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Nguyen-Minh, Tuan (author), Petrov, R.H. (author), Cicalè, Stefano (author), Kestens, L.A.I. (author)Rolling and annealing is a crucial technology to produce electrical steel sheets. This technology is not just aimed to control the geometry of steel sheets but more importantly to enhance the magnetic properties of the final products via appropriate microstructure and crystallographic texture. In this study, the evolution of microstructures...journal article 2024
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Shahriari, Ayda (author), Sanjari, Mehdi (author), Mahmoudiniya, Mahdi (author), Pirgazi, Hadi (author), Shalchi Amirkhiz, Babak (author), Kestens, L.A.I. (author), Mohammadi, Mohsen (author)This study explores the evolution of solidification microstructure of a laser powder bed fusion (L-PBF) martensitic stainless steel during solution annealing and aging. Quasi in-situ experiments using electron backscatter diffraction (EBSD) revealed that the finer, more equiaxed microstructure below the melt pool was susceptible to...journal article 2024
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Schouwenaars, R. (author), Kestens, L.A.I. (author)While the grain size effect (GSE) is universally observed in polycrystalline metals and alloys, extended dislocation pileups (DPUs) at grain boundaries (GBs) are rarely observed. Although this discrepancy was noticed over 50 years ago, DPUs are still widely accepted as the explanation for the GSE, often expressed as the Hall-Petch (HP)...journal article 2023
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Li, Jiayu (author), Xu, Yunbo (author), Jing, Yi (author), Gao, Yijing (author), Liu, Hongliang (author), Yu, Yongmei (author), Banis, Alexandros (author), Kestens, L.A.I. (author), Petrov, R.H. (author)The phase transformations, microstructure and properties of two Medium-Mn processed via quenching and partitioning steels were compared in this contribution and a new strategy for controlling mechanical properties by introducing and controlling cold-worked ferrite prior to heat treatment is proposed. It was found that during heating, the...journal article 2023
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Dehgahi, S. (author), Pirgazi, H. (author), Sanjari, M. (author), Seraj, P. (author), Odeshi, A. (author), Kestens, L.A.I. (author), Mohammadi, M. (author)The deformation performance of maraging steel samples fabricated using the laser powder bed fusion technique was evaluated using the split Hopkinson torsion bar (SHTB) test. Thin-walled tubular maraging steel samples were deformed under dynamic torsional loading at strain rates of 260 s<sup>−1</sup> to 720 s<sup>−1</sup> using twist angles...journal article 2022
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Shahriari, Ayda (author), Sanjari, Mehdi (author), Pirgazi, H. (author), Fazeli, Fateh (author), Shalchi Amirkhiz, Babak (author), Kestens, L.A.I. (author), Mohammadi, Mohsen (author)In this work, the effect of heating rate on the phase transformation temperatures was investigated using dilatometry analysis. Continuous heating and isothermal holding above Ac<sub>3</sub> temperature on microstructural evolutions in additively manufactured (AM) parts of Fe-Cr-Ni maraging stainless steel were studied. The microstructural...journal article 2022
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Figueroa, Carlos Gabriel (author), Schouwenaars, Rafael (author), Petrov, R.H. (author), Kestens, L.A.I. (author)This work analyses the effect of annealing conditions on tribolayer formation in copper under dry sliding conditions. Cold rolled material and samples annealed during 15, 30 and 45 min at 600 °C show an increase in grain size, decrease in hardness and increase in toughness and ductility with time. Electron backscattered diffraction maps...journal article 2022
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Kestens, L.A.I. (author), Nguyen-Minh, Tuan (author), Petrov, R.H. (author)The present paper investigates the role of parent phase topology on a crystallographic variant selection rule. This rule assumes that product phase nuclei appear at certain grain boundaries in the parent structure, such that a specific crystallographic orientation relationship is observed with both parent grains at either side of the grain...journal article 2022
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Habraken, Anne Marie (author), Aksen, Toros Arda (author), Alves, José L. (author), Amaral, Rui L. (author), Chandola, Nitin (author), Corallo, Luca (author), Engel, Bernd (author), Esener, Emre (author), Galan Lopez, J. (author), Kestens, L.A.I. (author)This article details the ESAFORM Benchmark 2021. The deep drawing cup of a 1 mm thick, AA 6016-T4 sheet with a strong cube texture was simulated by 11 teams relying on phenomenological or crystal plasticity approaches, using commercial or self-developed Finite Element (FE) codes, with solid, continuum or classical shell elements and different...journal article 2022
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Galan Lopez, J. (author), Shakerifard, B. (author), Ochoa Avendaño, J.F. (author), Kestens, L.A.I. (author)This work presents an advanced crystal plasticity model for the simulation of the mechanical behavior of multiphase advanced high-strength steels. The model is based on the Visco-Plastic Self-Consistent (VPSC) model and uses information about the material’s crystallographic texture and grain morphology together with a grain constitutive law. The...journal article 2021
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Galan Lopez, J. (author), Kestens, L.A.I. (author)Two of the microstructural parameters most influential in the properties of polycrystalline materials are grain size and crystallographic texture. Although both properties have been extensively studied and there are a wide range of analysis tools available, they are generally considered independently, without taking into account the possible...journal article 2021
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Shakerifard, B. (author), Galan Lopez, J. (author), Kestens, L.A.I. (author)The third generation of advanced high strength steels shows promising properties for automotive applications. The macroscopic mechanical response of this generation can be further improved by a better understanding of failure mechanisms on the microstructural level and micro-mechanical behavior under various loading conditions. In the current...journal article 2020
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Lanjewar, Harishchandra A. (author), Naghdy, Soroosh (author), Kestens, L.A.I. (author), Verleysen, Patricia (author)Manufacturing of ultrafine-grained (UFG) or nanocrystalline (NC) metals via a single step top-down approach imposing severe plastic deformation (SPD) is one of the most promising ways to achieve superior properties such as high strength and superplastic forming capability. Nonetheless, the lack of relevant data on their post-SPD performance...journal article 2019
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Azimi, M. (author), Toroghinejad, M. R. (author), Shamanian, M. (author), Kestens, L.A.I. (author)Ni aluminides have technologically attracted much attention as oxidation protective layers on Ni-superalloys for high-temperature and harsh environments applications as well as for reinforcements in metal-matrix composites. Among the Ni aluminides, the AlNi compound exhibits the best combination of oxidation-protective characteristics and...journal article 2019
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Ghodrat, S. (author), Kalra, Aakarshit (author), Kestens, L.A.I. (author), Riemslag, A.C. (author)In previous work on the thermo-mechanical fatigue (TMF) of compacted graphite iron (CGI), lifetimes measured under total constraint were confirmed analytically by numerical integration of Paris’ crack-growth law. In current work, the results for CGI are further validated for spheroidal cast iron (SGI), while TMF tests at different constraint...journal article 2019
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Lopez Covaleda, E.A. (author), Ghodrat, S. (author), Kestens, L.A.I. (author), Sacre, Charles Henry (author), Pardoen, Thomas (author)Compacted graphite iron is the material of choice for engine cylinder heads of heavy-duty trucks. Compacted graphite iron provides the best possible compromise between optimum mechanical properties, compared to flake graphite iron, and optimum thermal conductivity, compared to spheroidal graphite iron. The vermicular-shaped graphite particles...journal article 2018
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Galan Lopez, J. (author), Kestens, L.A.I. (author)Plastic deformation of metallic materials is an inherently anisotropic process as a result of the presence of preferential orientations in their crystallographic texture. Crystal plasticity modeling, which allows simulating the response of polycrystal aggregates taking into account their texture and other microstructural parameters, has been...journal article 2018
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Shakerifard, B. (author), Galan Lopez, J. (author), Hisker, F. (author), Kestens, L.A.I. (author)Recently, the third generation of advanced high strength steels (AHSSs) show promising properties for automotive applications. The improvement of macroscopic mechanical performance is not feasible without a deep understanding of the micromechanical behavior and failure micro-mechanisms involved during its response under various loading...journal article 2018
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Martinez Lombardia, Esther (author), Lapeire, Linsey (author), Maurice, Vincent (author), De Graeve, Iris (author), Klein, Lorena (author), Marcus, Philippe (author), Verbeken, Kim (author), Kestens, L.A.I. (author), Gonzalez Garcia, Y. (author), Mol, J.M.C. (author), Terryn, H.A. (author)When aiming for an increased and more sustainable use of metals a thorough knowledge of the corrosion phenomenon as function of the local metal microstructure is of crucial importance. In this work, we summarize the information presented in our previous publications[1-3] and present an overview of the different local (electrochemical) techniques...journal article 2017
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