Searched for: author%3A%22Offerman%2C+S.E.%22
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Krugla, M. (author), Offerman, S.E. (author), Sietsma, J. (author), Hanlon, Dave N. (author)
The production reality of sheet steels from casting to the end product is such that in the cases of ultra- and advanced high-strength steels, we have to deal with the segregation of elements on macro- and microlevels. Both can have a significant impact on the microstructure formation and resulting properties. There are several production stages...
journal article 2024
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dos Santos Avila, D. (author), Offerman, S.E. (author), Santofimia, Maria Jesus (author)
While experiments show that refining the prior austenite grain size can either accelerate or decelerate bainite formation in steels, kinetic models based on the successive nucleation of bainitic ferrite subunits can only predict an acceleration. In this work we develop a physically-based model for bainite kinetics assuming a displacive growth...
journal article 2024
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Hosseini, A. (author), Hage, Johannes (author), Meijer, Koen (author), Offerman, S.E. (author), Yang, Y. (author)
In this paper a CFD analysis of HIsarna off-gas system for post combustion of CO-H2-carbon particle mixture is presented to evaluate the effect of different sub-models and parameters on the accuracy of predictions and simulation time. The effects of different mesh type, mesh grid size, radiation models, turbulent models, kinetic mechanism,...
journal article 2023
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Hosseini, A. (author), Calis, Randy (author), van der Plas, Dirk (author), Put, Pieter (author), Agema, Jelle (author), Meijer, Koen (author), Hage, Johannes (author), Offerman, S.E. (author), Yang, Y. (author)
The HIsarna off-gas system wall is a cooling jacket made of cooling pipes arranged in the radial direction and in a circular pattern. Part of the off-gas system cooling pipes are isolated using a low-thermal-conductivity refractory material to protect the cooling pipe from melting and thermal stresses. During long runs and due to...
journal article 2023
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Garcia Chao, P. (author), Eipe, Jonathan J. (author), Krugla, M. (author), Bos, Cornelis (author), Sietsma, J. (author), Kranendonk, Winfried (author), Offerman, S.E. (author)
In the present study, the nucleation of static recrystallization (SRX) in austenite after hot deformation is experimentally analyzed using a Ni-30 pct Fe model alloy. In agreement with the predictions by current models, nucleation rate exhibits a strong peak, early during SRX. Whereas such an early peak is explained by current models by the...
journal article 2023
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van Dokkum, J.S. (author), Bos, Cornelis (author), Offerman, S.E. (author), Sietsma, J. (author)
Modelling dislocation glide over the initial part of a stress–strain curve of metals received little attention up to now. However, dislocation glide is essential to ones understanding of the fundamental relationship between inelastic deformation and the evolution of the dislocation network structure. Therefore, we present a model of...
journal article 2023
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Hosseini, A. (author), Dhiman, Vinod (author), Meijer, Koen (author), Zeilstra, Christiaan (author), Hage, Johannes (author), Peeters, Tim (author), Offerman, S.E. (author), Yang, Y. (author)
A three-dimensional computational fluid dynamics (CFD) model for the HIsarna off-gas system is set up and validated by real plant data. In the model detailed reaction mechanism and kinetic data for post-combustion of CO-H2 mixture and carbon particles are incorporated. The results are presented and discussed in another study (Part 1) by the...
journal article 2022
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Georgakopoulos, E. (author), Hosseini, A. (author), Kerry, T.J. (author), Hage, Johannes (author), Meijer, Koen (author), Offerman, S.E. (author), Yang, Y. (author)
HIsarna is a novel ironmaking process with great raw materials versatility that is attractive for various secondary resources. Among the materials that can be recycled, there is steel scrap which is fed to the furnace bath through an inclined chute. The velocity distribution of the scrap particles along the chute affects the particles’...
journal article 2022
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Hosseini, A. (author), Georgakopoulos, E. (author), Dihman, Vinod (author), Hage, Johannes (author), Meijer, Koen (author), Zeilstra, Christiaan (author), Offerman, S.E. (author), Yang, Y. (author)
Galvanized steel scrap flow and injection into the HIsarna reactor are investigated using discrete element method (DEM). The scrap particle is fed into the reactor through an inclined chute and hits the slag surface where the zinc content is evaporated and solid particles melt. A DEM model is setup and validated using experimental data...
journal article 2022
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Kerry, T.J. (author), Peters, A.G.A. (author), Georgakopoulos, E. (author), Dugulan, A.I. (author), Meijer, Koen (author), Hage, Johannes (author), Offerman, S.E. (author), Yang, Y. (author)
Within the steelmaking industry, a large amount of zinc-bearing waste is produced which cannot be effectively treated through integrated steel mills. Concurrently, zinc smelters generate waste residues containing significant amounts of iron and zinc which are stored or landfilled. The zinc concentration of iron and steelmaking residues...
journal article 2022
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Hosseini, A. (author), Dhiman, Vinod (author), Meijer, Koen (author), Zeilstra, Christiaan (author), Hage, Johannes (author), Peeters, Tim (author), Offerman, S.E. (author), Yang, Y. (author)
The HIsarna process is a new and breakthrough smelting reduction process for hot metal (liquid iron) production from iron ores and coal directly fed into the reactor. The flue gas from the main reactor enters the off-gas system containing small amounts of H<sub>2</sub>, CO and carbon particles which need to be removed before further treatment...
journal article 2022
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Hosseini, A. (author), Moosavi-Khoonsari, Elmira (author), Meijer, Koen (author), Hage, Johannes (author), Peeters, Tim (author), Offerman, S.E. (author), Yang, Y. (author)
HIsarna reactor is characterized by a high raw materials versatility and is therefore attractive for processing secondary iron sources. Among the materials that can be recycled through HIsarna, zinc-bearing material has drawn a special attention. Based on the plant data, once dust-containing Zinc was injected into the main reactor, a final...
journal article 2022
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Hosseini, A. (author), Hage, Johannes L.T. (author), Duiker, Arjan (author), Meijer, Koen (author), Peeters, Tim (author), Offerman, S.E. (author), Yang, Y. (author)
For all industrial applications, predicting system characteristics and behavior plays a vital role before constructing costly and complex multi-physic systems. Correct and reliable predictions become even more important once the aim is to go from small- to large-scale processes to establish an industrial demonstrations. In this study, a CFD...
journal article 2022
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Borra, C.R. (author), Vlugt, T.J.H. (author), Yang, Y. (author), Spooren, Jeroen (author), Nielsen, Peter (author), Amirthalingam, Murugaiyan (author), Offerman, S.E. (author)
The circular economy demands waste utilization for the production of high-value products, and this requires the development of novel processing routes. In this study, rare earth (La and Ce) oxides were completely (&gt;99%) recovered from polishing waste by a combined novel reductive acid leaching and alkali treatment process. About 70% of...
journal article 2021
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van Dokkum, J.S. (author), Bos, C. (author), Offerman, S.E. (author), Sietsma, J. (author)
Intricate knowledge of dislocation networks in metals has proven paramount in understanding the constitutive behaviour of these materials but current experimental methods yield limited information on the characteristics of these networks. Recently, the isotropic anelastic response of metals has been used to investigate complex dislocation...
journal article 2021
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Ioannidou, C. (author), Navarro Lopez, A. (author), Dalgliesh, Robert M. (author), Rijkenberg, Arjan (author), Geerlofs, N. (author), Pappas, C. (author), Sietsma, J. (author), van Well, A.A. (author), Offerman, S.E. (author)
In-situ Neutron Diffraction and Small-Angle Neutron Scattering (SANS) are employed for the first time simultaneously in order to reveal the interaction between the austenite to ferrite phase transformation and the precipitation kinetics during isothermal annealing at 650 and at 700 °C in three steels with different vanadium (V) and carbon (C)...
journal article 2021
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Kerry, T.J. (author), Peters, Alexander (author), Georgakopoulos, E. (author), Hosseini, A. (author), Offerman, S.E. (author), Yang, Y. (author)
The steelmaking industry produces large quantities of zinc-bearing wastes of varying forms that cannot be treated through integrated steelmaking processes. Simultaneously, by-products of the zinc industry containing great amounts of iron and zinc are stored or landfilled. The amount of zinc in these materials is generally below that which is...
conference paper 2020
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Zhang, Xukai (author), Ioannidou, C. (author), ten Brink, Gert H. (author), Navarro Lopez, A. (author), Wormann, Jan (author), Campaniello, Jean (author), Dalgliesh, Robert M. (author), van Well, A.A. (author), Offerman, S.E. (author), Kranendonk, Winfried (author), Kooi, Bart J. (author)
A cold-rolled Ti-V high strength low alloy (HSLA) steel was isothermally annealed at 650 °C and 700 °C for different times. A unique combination of techniques including visible light microscopy (VLM), transmission electron microscopy (TEM), matrix dissolution, small angle neutron scattering (SANS) and hardness measurement has been employed to...
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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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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