Searched for: author:"Kestens, L.A.I."
(1 - 20 of 20)
document
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
document
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
document
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
document
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
document
Lopez-Covaleda, Edwin 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
document
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
document
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
document
Kestens, L.A.I. (author), De Knijf, Dorien (author), Castro Cerda, F. (author), Petrov, R.H. (author)
Texture and microstructure formation during annealing of a 75% cold rolled AHS steel, reheated at a rate of 10°C/s to ~3000°C/s were studied with the purpose to investigate the interaction between the recrystallization and the austenite formation as well as the possibility of grain refinement. It was found that at ultra-high heating rates, the...
journal article 2017
document
Ghodrat, S. (author), Riemslag, A.C. (author), Kestens, L.A.I. (author)
Orientation contrast microscopy (i.e., electron backscattered diffraction, EBSD) was employed to monitor the plastic strain in loaded tensile samples of aluminium alloy Al6061 in T4 condition. The kernel average misorientation (KAM) is known to be an appropriate parameter in orientation contrast microscopy which has the potential to characterise...
journal article 2017
document
Naghdy, Soroosh (author), Pirgazi, Hadi (author), Verleysen, Patricia (author), Petrov, R.H. (author), Kestens, L.A.I. (author)
International Union of Crystallography. The aim of this paper is to examine the morphological and crystallographic anisotropy that develops during high-pressure torsion (HPT) processing. Commercially pure aluminium was subjected to monotonic HPT deformation at room temperature. The microstructure and texture were studied by large-area electron...
journal article 2017
document
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
document
Azimi, Monireh (author), Toroghinejad, Mohammad Reza (author), Shamanian, Morteza (author), Kestens, L.A.I. (author)
In the present work, the influence of strain on phase formation at the Al/Ni interface was investigated during cold roll bonding and annealing. A sandwich sample composed of an Al-Ni-Al stack was cold rolled with reductions in the range of 50% to 90%, followed by annealing at 450 °C for 60 min. The crystallography of the annealed sandwich...
journal article 2017
document
Pirgazi, H. (author), Kestens, L.A.I. (author)
Manual serial sectioning which includes consecutive steps of sample preparation and Electron Back Scattering Diffraction (EBSD) measurement was employed to extract the twodimensional (2D) sections of a pure nickel sample and to reconstruct the three-dimensional (3D) microstructure. A general alignment algorithm based on the minimization of...
conference paper 2015
document
Ghodrat, S. (author), Pirgazi, H. (author), Kestens, L.A.I. (author)
To the purpose of evaluating the effect of deformation on the microstructure, aluminum structures were analyzed on tensile strained samples extended to 25% elongation. In the substructure of these deformed samples linear slip patterns were observed, generally confined to the bulk of the grain. In order to study the crystallographic aspect of...
conference paper 2015
document
Lapeire, L. (author), Sidor, J. (author), Martinez Lombardia, E. (author), Verbeken, K. (author), De Graeve, I. (author), Terryn, H.A. (author), Kestens, L.A.I. (author)
Nowadays, there is a considerable scientific interest in bulk ultrafine grained materials, due to their potential for superior mechanical properties. One of the possible formation methods of nano-grained materials is cryogenic rolling. The influence of rolling at cryogenic temperatures has been investigated. Significant differences in the...
conference paper 2015
document
Gomes, E. (author), Kestens, L.A.I. (author)
Two new methods, one for determining the experimentally observed Orientation Relationship (OR) and another for reconstructing prior austenite phase, are proposed. Both methods are based on the angular deviation of the OR at the grain boundaries. The first algorithm identifies the optimum OR using the misorientation distribution of the entire...
conference paper 2015
document
Nguyen-MInh, T. (author), Sidor, J.J. (author), Petrov, R.H. (author), Kestens, L.A.I. (author)
Due to progressive deformation, the dislocation densities in crystals are accumulated and the resistance of grains to further deformation increases. Homogeneous deformation becomes energetically less favorable, which may result for some orientations in strain localization. In-grain shear banding, a typical kind of localized deformation in metals...
conference paper 2015
document
Pirgazi, H. (author), Glowinski, K. (author), Morawiec, A. (author), Kestens, L.A.I. (author)
Five macroscopic boundary parameters can be extracted from three-dimensional orientation maps. Serial sectioning, which includes consecutive steps of material removal, and electron backscatter diffraction (EBSD) measurement were employed to extract a stack of two-dimensional sections of a pure nickel sample. The EBSD patterns were collected from...
journal article 2015
document
De Knijf, D. (author), Nguyen-Minh, T. (author), Petrov, R.H. (author), Kestens, L.A.I. (author), Jonas, J.J. (author)
The orientation dependence of the austenite-to-martensite transformation during uniaxial tensile testing was modelled using the phenomenological theory of martensite crystallography and the mechanical driving force. It was validated experimentally by means of electron backscatter diffraction measurements on a pre-defined zone of a quenched and...
journal article 2014
document
Ghodrat, S. (author), Riemslag, T.A.C. (author), Kestens, L.A.I. (author), Petrov, R.H. (author), Janssen, M. (author), Sietsma, J. (author)
In cylinder heads of compacted graphite iron (CGI), the heating and cooling cycles can lead to localized cracking due to thermomechanical fatigue (TMF). Traditionally, TMF behavior is studied by thermal cycling of smooth specimens. The resulting number of cycles to failure (Nf) constitutes a single parameter that can be used to predict actual...
journal article 2012
Searched for: author:"Kestens, L.A.I."
(1 - 20 of 20)