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Jiang, Quanxin (author), Morete Barbosa Bertolo, V. (author), Popovich, V. (author), Sietsma, J. (author), Walters, C.L. (author)Macroscale cleavage fracture toughness of high strength steels is strongly related to the fracture of hard microstructural inclusions. Therefore, an accurate determination of the local stress on these inclusions based on the matrix stress is necessary for the statistical modelling of macroscale cleavage fracture. This paper presents...journal article 2021
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Yilmaz, A. (author), Traka, K. (author), Pletincx, S. (author), Hauffman, T. (author), Sietsma, J. (author), Gonzalez Garcia, Y. (author)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...journal article 2021
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Vittorietti, M. (author), Kok, Piet J.J. (author), Sietsma, J. (author), Li, W. (author), Jongbloed, G. (author)Modeling microstructures is an interesting problem not just in materials science, but also in mathematics and statistics. The most basic model for steel microstructure is the Poisson-Voronoi diagram. It has mathematically attractive properties and it has been used in the approximation of single-phase steel microstructures. The aim of this...journal article 2020
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Ravi, A.M. (author), Navarro Lopez, A. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)Bainite formation in steels typically starts at austenite grain boundaries and continues through nucleation of bainite at newly formed bainitic ferrite/austenite interfaces. Recent experimental evidence has pointed out that austenite to bainite transformation can also proceed in the presence of martensite. Studies suggest that the presence of...journal article 2020
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Ravi, A.M. (author), Kumar, A. (author), Herbig, Michael (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)The rate of bainite formation depends on several factors such as austenite grain size, decomposition of austenite into other phases and austenite composition. Although studies have been carried out to understand various factors affecting bainite formation, open lines of investigation still remain. In this work, the effect of ferrite formation...journal article 2020
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Navarro Lopez, A. (author), Ioannidou, C. (author), van der Wal, E.M. (author), Arechabaleta Guenechea, Z. (author), van den Oever, R. (author), Verleg, M.N. (author), Dalgliesh, R. M. (author), Sykora, J. (author), Akeroyd, F. A. (author), Geerlofs, N. (author), Sietsma, J. (author), Pappas, C. (author), van Well, A.A. (author), Offerman, S.E. (author)Interphase precipitation occurring during solid-state phase transformations in micro-alloyed steels is generally studied through transmission electron microscopy, atom probe tomography, and ex situ measurements of Small-Angle Neutron Scattering (SANS). The advantage of SANS over the other two characterization techniques is that SANS allows...journal article 2020
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Schrama, F.N.H. (author), Ji, Fuzhong (author), Hunt, Adam (author), Beunder, Elisabeth M. (author), Woolf, Rhian (author), Tuling, Alison (author), Warren, Peter (author), Sietsma, J. (author), Boom, R. (author), Yang, Y. (author)To lower the iron losses of the hot metal desulphurisation (HMD) process, slag modifiers can be added to the slag. Slag modifiers decrease the apparent viscosity of the HMD slag. Most common slag modifiers in industry contain fluoride as a fluidiser. However, fluoride leads to a higher magnesium consumption and has health, safety and...journal article 2020
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Ravi, A.M. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)Low temperature bainite formation in high-carbon steels leads to highly refined microstructures. However, the rate of bainite formation becomes impractically low as the bainite formation temperature decreases. Thus, it is important to create strategies to accelerate the low-temperature bainite formation kinetics in high-carbon steels. In this...journal article 2020
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Marques Pereira, V. (author), Schut, H. (author), Sietsma, J. (author)An approach to improve the performance of steels for fusion reactors is to reinforce them with oxide nanoparticles. These can hinder dislocation and grain boundary movement and trap radiation-induced defects, thus increasing creep and radiation damage resistance. The present work investigates the thermal stability of the microstructure and...journal article 2020
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Ou, X. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)Molecular dynamics simulations are used to study the effects of tensile loading on nucleation and subsequent growth of bcc phase in pure fcc iron. The results show that orientation variant selection occurs during the stress-induced fcc-to-bcc transformation, which leads to the coalescence of neighbouring bcc platelets with identical...journal article 2020
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Wempe, Joost (author), van den Brink, Rick (author), Mooldijk, Esmée (author), Feirabend, Nienke (author), Wiersma, R.T. (author), Sietsma, J. (author), Dik, J. (author)During the Second World War the German occupants of the Netherlands made ample use of the Scheveningen prison near The Hague, popularly nicknamed the Oranjehotel. One former death cell in this infamous prison (Doodencel 601) has been preserved in its original condition, showing wartime inscriptions on the cell walls. Interestingly, a small...journal article 2020
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Gavel, D.J. (author), Adema, A.T. (author), van der Stel, Jan (author), Sietsma, J. (author), Boom, R. (author), Yang, Y. (author)Effect of nut coke addition with ferrous burden (pellet and sinter mixture) is experimentally investigated under simulated blast furnace conditions. Nut coke mixing degree was varied (0, 20 and 40 wt-%) as a replacement of the regular coke. During smelting, the ferrous bed evolves through three distinct stages of shrinkage due to indirect...journal article 2020
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Jongbloed, G. (author), Mc Garrity, K.S. (author), Sietsma, J. (author)Kernel estimators are proposed for estimating the cumulative distribution functions and the probability density functions of several quantities of interest in a stereological oriented cylinder model. This oriented cylinder model was developed to represent anisotropic microstructural features in materials. The asymptotic properties of these...journal article 2020
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Gavel, D.J. (author), Adema, Allert (author), van der Stel, Jan (author), Peeters, Tim (author), Sietsma, J. (author), Boom, R. (author), Yang, Y. (author)Physicochemical behaviour of the pellets, sinters and its mixture (60% pellets: 40% sinter) is investigated by a series of smelting and quenching experiments. For all ferrous raw-material beds, three distinct stages of bed shrinkage occur due to indirect reduction, softening and melting. However, the characteristic nature (displacement,...journal article 2020
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Navarro Lopez, A. (author), Hidalgo Garcia, J. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)The initial formation of athermal martensite was proven to accelerate the subsequent bainite formation kinetics during isothermal holdings below the martensite-start temperature (M<sub>s</sub>). The presence of prior athermal martensite (PAM) within the phase mixture is expected to modify the overall mechanical response of these newly...journal article 2020
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Chen, Z. (author), Zeilstra, Christiaan (author), van der Stel, Jan (author), Sietsma, J. (author), Yang, Y. (author)In order to understand the thermal decomposition kinetics of hematite particles in inert atmosphere, thermogravimetriy was employed for isoconversional analysis. The kinetic triplet was estimated from the experimental data and the isothermal reaction kinetics was predicted. The results indicated that the thermal decomposition could be divided...journal article 2020
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Hidalgo Garcia, J. (author), Vittorietti, M. (author), Farahani, H. (author), Vercruysse, F. (author), Petrov, R.H. (author), Sietsma, J. (author)Understanding the local strain enhancement and lattice distortion resulting from different microstructure features in metal alloys is crucial in many engineering processes. The development of heterogeneous strain not only plays an important role in the work hardening of the material but also in other processes such as recrystallization and...journal article 2020
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Shah, Vitesh (author), Krugla, M. (author), Offerman, S.E. (author), Sietsma, J. (author), Hanlon, David Neal (author)This study presents the effects of silicon (Si) and manganese (Mn) concentration and of heating rate on the ferrite recrystallization kinetics in seven model alloys with different Si and Mn concentrations, which are of relevance for the development of Advanced High Strength Steels (AHSS). The recrystallization kinetics were studied with in...journal article 2020
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Sedighiani, K. (author), Diehl, M. (author), Traka, K. (author), Roters, F. (author), Sietsma, J. (author), Raabe, D. (author)A severe obstacle for the routine use of crystal plasticity models is the effort associated with determining their constitutive parameters. Obtaining these parameters usually requires time-consuming micromechanical tests that allow probing of individual grains. In this study, a novel, computationally efficient, and fully automated approach is...journal article 2020
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Ioannidou, C. (author), Navarro Lopez, A. (author), Rijkenberg, Arjan (author), Dalgliesh, Robert M. (author), Koelling, Sebastian (author), Pappas, C. (author), Sietsma, J. (author), van Well, A.A. (author), Offerman, S.E. (author)In-situ Small-Angle Neutron Scattering (SANS) is used to determine the time evolution of the chemical composition of precipitates at 650 °C and 700 °C in three micro-alloyed steels with different vanadium (V) and carbon (C) concentrations. Precipitates with a distribution of substoichiometric carbon-to-metal ratios are measured in all steels....journal article 2020