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Chen, Z. (author), Qu, Yingxia (author), Zeilstra, Christiaan (author), van der Stel, Jan (author), Sietsma, J. (author), Yang, Y. (author)Melting and reduction of fine iron ore particles in the gas environment of a HIsarna smelting cyclone is a critically important topic, but very limited information is currently available except for some experimental data from high temperature drop tube furnace (HTDF). This work discusses the equilibrium state of reacting iron ore in the HTDF...journal article 2018
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Gavel, D.J. (author), Song, Qingshi (author), Adema, A.T. (author), van der Stel, Jan (author), Sietsma, J. (author), Boom, R. (author), Yang, Y. (author)In the blast furnace, nut coke is utilized in a mixture with the ferrous burden to improve the gas permeability. Although applied in a broad range (10–40 mm, 2–23 wt-%), limited information is available on changed burden behaviour in its presence. In the present study, the detailed characterization was performed on the iron ore pellets quenched...journal article 2018
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Navarro Lopez, A. (author), Hidalgo Garcia, J. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)The accelerated formation of bainite in presence of martensite is opening a new processing window for the steel industry. However, for a feasible industrial implementation, it is necessary to determine the mechanical behaviour of the steels developed under such conditions. This study focuses on analysing the effects of the formation of...journal article 2018
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Venkatesan, P. (author), Sun, Z.H.I. (author), Sietsma, J. (author), Yang, Y. (author)In this manuscript, we demonstrate a room temperature electrochemical process for efficiently recycling NdFeB magnet waste. First, the magnet waste was completely leached with HCl and then, in-situ electrochemical oxidation was performed to selectively oxidize Fe(II) in the leachate to Fe(III). Finally, oxalic acid was added directly to the...journal article 2018
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Naeimi, M. (author), Li, S. (author), Li, Z. (author), Wu, J. (author), Petrov, R.H. (author), Sietsma, J. (author), Dollevoet, R.P.B.J. (author)This research presents a coupled thermomechanical modelling procedure for the wheel-rail contact problem and computes the flash-temperature and stress-strain responses when thermal effects are present. A three-dimensional elasto-plastic finite element model was built considering the wheel-track interaction. When the wheel is running on rail,...journal article 2018
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Venkatesan, P. (author), Vander Hoogerstraete, Tom (author), Hennebel, Tom (author), Binnemans, Koen (author), Sietsma, J. (author), Yang, Y. (author)NdFeB magnet waste is one of the important secondary resources from which rare-earth elements (REEs) can be recovered. Herein we present an electrochemical route to selectively extract REEs from the magnet waste at room temperature. First, the magnet waste was partially leached with HCl. The partial leachate along with undissolved magnet...journal article 2018
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Arechabaleta Guenechea, Z. (author), van Liempt, P. (author), Sietsma, J. (author)Understanding the intricate structure of dislocations in metals is a major issue in materials science. In this paper we present a comprehensive approach for the characterisation of dislocation networks, resulting in accurate quantification and significantly increasing the insight into the dislocation structure. Dislocation networks in metals...journal article 2018
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Nishikawa, A.S. (author), Santofimia, Maria Jesus (author), Sietsma, J. (author), Goldenstein, Hélio (author)In the present study the microstructural evolution and kinetics of carbon redistribution during the partitioning step of the Quenching and Partitioning process are investigated by means of a modeling approach that simultaneously considers the martensite-austenite carbon partitioning and the decomposition of austenite into bainitic ferrite....journal article 2018
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Karewar, S.V. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)Molecular dynamics (MD) simulations are used to study the effect of different defect configurations and their arrangements in the parent fcc phase on atomistic mechanisms during the martensitic transformation mechanisms in pure Fe. The defect configurations considered are stacking faults (SF) and twin boundaries (TB) in single crystal fcc. Three...journal article 2018
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Alizadeh Otorabad, H. (author), Tehrani, Parisa Hosseini (author), Younesian, Davood (author), Sietsma, J. (author), Petrov, R.H. (author)Studying the temperature evolution of the thermally affected zone (TAZ) of sliding surfaces is crucial because of its influence on microstructural evolution, wear, and fatigue. Due to the complexity of thermal analysis of sliding bodies, relationships that predict their surface temperature evolution are very helpful because they can be used as...journal article 2018
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Wu, J. (author), Petrov, R.H. (author), Kölling, S. (author), Godet, Stephane (author), Sietsma, J. (author)Micro- to nano-scale characterization of the microstructures in the white etching layer (WEL), observed in a Dutch R260 Mn grade rail steel, was performed via various techniques. Retained austenite in the WEL was identified via electron backscatter diffraction (EBSD), automatic crystallographic orientation mapping in transmission electron...journal article 2018
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Peelman, S. (author), Sietsma, J. (author), Yang, Y. (author)Neodymium is a critical element used in many high-tech applications. However, despite this, the EU is entirely dependent on China for its Nd supply. This has driven the EU to develop recycling strategies to recover its Nd from end-of-life (EoL) products and wastes, and establish a domestic supply. This paper proposes a process to recycle Nd from...journal article 2018
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Peelman, S. (author), Kooijman, D. (author), Sietsma, J. (author), Yang, Y. (author)The present study proposes three distinct processes to recycle rare earth elements (REE) from two low-grade secondary resources: REE-containing mine tailings and ferrous scrap from shredded waste of electrical and electronic equipment (WEEE). The first developed process extracts both REE and phosphorus from the apatite mineral contained within...journal article 2018
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- Ayenampudi, S. (author), Celada-Casero, Carola (author), Sietsma, J. (author), Santofimia, Maria Jesus (author) other 2017
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Sietsma, J. (author)Bij het begrip pingpongballen denken we niet direct aan wetenschap. Toch wist prof. Willie Burgers, in een tijd waarin zeer beperkte computers nog hele kamers vulden en geen grafische output gaven, sets pingpongballen te gebruiken als wetenschappelijke instrumenten om atomaire structuren te onderzoeken en beschrijven. De pingpongballenmodellen...book chapter 2017
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Puype, A. (author), Malerba, L. (author), De Wispelaere, N. (author), Petrov, R.H. (author), Sietsma, J. (author)The microstructure of a 9Cr-1W-0.22V-0.09Ta-0.11C reduced activation ferritic/martensitic (RAFM) steel has been investigated after thermo-mechanical rolling with subsequent annealing for 30 min at temperatures of 880 °C, 920 °C, 980 °C and 1050 °C, followed by water quenching. Scanning and transmission electron microscopy investigations and...journal article 2017
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Ravi, A.M. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)Over the years, a quantitative theory to explain bainite formation kinetics has been proposed based on the nucleation kinetics of bainitic sub-units. Although the theory shows acceptable correlation with experimental results, it is observed that the kinetic models show a certain degree of discrepancy with actual kinetics. It is identified...journal article 2017
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Kim Lee, B.N. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)Understanding carbon redistribution in steels is crucial in developing advanced high strength steels. For instance, Quenching & Partitioning (Q&P) processes rely on the partitioning of carbon from martensite into austenite, where at the end of the heat treatment the carbon-enriched austenite shows higher stability at room temperature....journal article 2017
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Abbasalizadeh, A. (author), Malfliet, Annelies (author), Seetharaman, Seshadri (author), Sietsma, J. (author), Yang, Y. (author)In the present research on rare earth extraction from rare earth oxides (REOs), conversion of rare earth oxides into rare earth fluorides with fluoride fluxes is investigated in order to overcome the problem of low solubility of the rare earth oxides in molten fluoride salts as well as the formation of oxyfluorides in the fluorination process....journal article 2017
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Naeimi, M. (author), Li, Z. (author), Petrov, R.H. (author), Sietsma, J. (author), Dollevoet, R.P.B.J. (author)A new downscale test rig is developed for investigating the contact between the wheel and rail under impact-like loading conditions. This paper presents the development process of the setup, including review and synthesis of the potential experimental techniques, followed by scalability, mechanical and operational analysis of the new setup. The...journal article 2017