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Tirumalasetty, G.K. (author), Van Huis, M.A. (author), Fang, C.M. (author), Xu, Q. (author), Tichelaar, F.D. (author), Hanlon, D.N. (author), Sietsma, J. (author), Zandbergen, H.W. (author)Multiphase steels utilising composite strengthening may be further strengthened via grain refinement or precipitation by the addition of microalloying elements. In this study a Nb microalloyed steel comprising martensite, bainite and retained austenite has been studied. By means of transmission electron microscopy (TEM), we have investigated the...journal article 2011
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- Krielaart, G.P. (author), Sietsma, J. (author), Van der Zwaag, S. (author) journal article 1997
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Tirumalasetty, G.K. (author), Van Huis, M.A. (author), Kwakernaak, C. (author), Sietsma, J. (author), Sloof, W.G. (author), Zandbergen, H.W. (author)Uniaxial straining experiments were performed on a rolled and annealed Si-alloyed TRIP (transformation-induced plasticity) steel sheet in order to assess the role of its microstructure on the mechanical stability of austenite grains with respect to martensitic transformation. The transformation behavior of individual metastable austenite grains...journal article 2012
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Tirumalasetty, G.K. (author), Fang, C.M. (author), Xu, Q. (author), Jansen, J. (author), Sietsma, J. (author), Van Huis, M.A. (author), Zandbergen, H.W. (author)A transmission electron microscopy study was conducted on nanoprecipitates formed in Ti microalloyed transformation-inducedplasticity-assisted steels, revealing the presence of Ti(N), Ti2CS and a novel type of ultra-fine Fe(C) precipitate. The matrix/precipitate orientation relationships, sizes and shapes were investigated in detail. The...journal article 2012
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Tirumalasetty, G.K. (author), Van Huis, M.A. (author), Kwakernaak, C. (author), Sietsma, J. (author), Sloof, W.G. (author), Zandbergen, H.W. (author)A combination of Electron Back-Scattered Diffraction (EBSD) and high-sensitivity Electron Probe Micro-Analysis (EPMA) was used to correlate the changes in microstructural features upon deformation with local chemical composition in Transformation-Induced Plasticity steels. A novel cleaning procedure was developed that allows complete monitoring...journal article 2013
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Tirumalasetty, G.K. (author), Fang, C.M. (author), Jansen, J. (author), Yokosawa, T. (author), Boeije, M.J.F. (author), Sietsma, J. (author), Van Huis, M.A. (author), Zandbergen, H.W. (author)Chromium (Cr), Manganese (Mn), and Carbon (C) are well known alloying elements used in technologically important alloy steels and advanced high strength steels. It is known that binary CrCx and MnCx carbides can be formed in steels, but in this study we reveal for the first time that Cr and Mn were found combined in novel ternary cementite type ...journal article 2014
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Yilmaz, A. (author), He, X. (author), Pletincx, Sven (author), Hauffman, Tom (author), Sietsma, J. (author), Gonzalez Garcia, Y. (author)The role of prior austenite grain size (PAGS) on the passive layer properties of martensitic steels is studied. Electron backscatter diffraction analysis shows that PAGS between 5 and 66 µm were obtained after applying different heat treatments. The barrier properties of passive film deteriorate with grain refinement up to 28 µm, attributed to...journal article 2022
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Yilmaz, A. (author), Ozkan, C. (author), Sietsma, J. (author), Gonzalez Garcia, Y. (author)The effect of ferrite-pearlite and ferrite-martensite phase combinations on the passive layer properties of low carbon steel is investigated in a 0.1 M NaOH solution. Heat treatments were designed to obtain ferrite-pearlite and ferrite-martensite microstructures with similar ferrite volume fractions. Potentiostatic polarisation and...journal article 2021
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Traka, K. (author), Sedighiani, K. (author), Bos, C. (author), Galan Lopez, J. (author), Angenendt, Katja (author), Raabe, Dierk (author), Sietsma, J. (author)A cellular automaton algorithm for curvature-driven coarsening is applied to a cold-rolled interstitial-free steel's microstructure - obtained through electron backscatter diffraction (EBSD). Recrystallization nucleation occurs naturally during the simulation, due to the highly heterogeneous and hence competitive growth among pre-existing ...journal article 2021
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Koopmans, T.T.W. (author), Sietsma, J. (author), Zhao, L. (author), Santofimia, Maria Jesus (author)The quenching and partitioning (Q&P) process is a heat treatment process, aiming at the creation of steel microstructures composed of martensite and retained austenite. Herein, the thermal stability of the microstructure is investigated upon reheating steel microstructures, created with different Q&P settings, in different thermal...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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Sedighiani, K. (author), Traka, K. (author), Roters, Franz (author), Raabe, Dierk (author), Sietsma, J. (author), Diehl, Martin (author)Physics-based crystal plasticity models rely on certain statistical assumptions about the collective behavior of dislocation populations on one slip system and their interactions with the dislocations on the other slip systems. One main advantage of using such physics-based constitutive dislocation models in crystal plasticity kinematic...journal article 2022
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Hajizad, O. (author), Kumar, A. (author), Petrov, R.H. (author), Sietsma, J. (author), Dollevoet, R.P.B.J. (author), Li, Z. (author)Microscopic stress and strain partitioning control the mechanical and damage behavior of multiphase steels. Using a combined numerical and experimental approach, local strain distributions and deformation localization are characterized in a carbide free bainitic steel produced by continuous cooling. The microstructure of the steel consists of...journal article 2022
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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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Morete Barbosa Bertolo, V. (author), Jiang, Q. (author), Terol Sanchez, M. (author), Riemslag, A.C. (author), Walters, C.L. (author), Sietsma, J. (author), Popovich, V. (author)High strength steels are widely used for structural applications, where a combination of excellent strength and ductile-to-brittle transition (DBT) properties are required. However, such a combination of high strength and toughness can be deteriorated in the heat affected zone (HAZ) after welding. This work aims to develop a relationship...journal article 2023
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Abraham Mathews, J. (author), Farahani, H. (author), Sietsma, J. (author), Petrov, R.H. (author), Mecozzi, M.G. (author), Santofimia, Maria Jesus (author)The influence of carbon concentration variations on pearlite formation (20 h at 600 °C) in a case-carburized steel is investigated. The resultant microstructure shows three distinct regions: carburized case, a transition region, and the original core. The microstructural transition from the case to the core regions is observed to be...journal article 2023
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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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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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Celada-Casero, Carola (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)There is sufficient experimental evidence to propose that the formation kinetics of athermal martensite directly depends on the austenite grain structure from which the martensite forms. Yet, this dependence is frequently ignored. The present study investigates the role of the prior austenite grain size (PAGS) in the martensitic...journal article 2019
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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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