Searched for: author:"Petrov, R.H."
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Vercruysse, Florian (author), Celada-Casero, Carola (author), Linke, Bernd M. (author), Verleysen, Patricia (author), Petrov, R.H. (author)
Because of their excellent combination of strength and ductility, quenching and partitioning (Q & P) steels have a great chance of being added to the third generation of advanced high strength steels. The large ductility of Q & P steels arises from the presence of 10% to 15% of retained austenite which postpones necking due to the...
journal article 2020
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Karami, K. (author), Blok, A. (author), Weber, L.R.M. (author), Ahmadi, S.M. (author), Petrov, R.H. (author), Nikolic, Ksenija (author), Borisov, E.V. (author), Leeflang, M.A. (author), Ayas, C. (author), Zadpoor, A.A. (author), Mehdipour, M. (author), Reinton, T.E. (author), Popovich, V. (author)
Additive manufacturing technologies in general and laser powder bed fusion (L-PBF) in particular have been on the rise in different applications, including biomedical implants. The effects of the various L-PBF process parameters on the microstructure and properties of Ti6Al4V lattice structures have been studied before. However, the...
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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Papaefthymiou, Spyros (author), Banis, Alexandros (author), Bouzouni, Marianthi (author), Petrov, R.H. (author)
The current work focuses on complex multiphase microstructures gained in CrMo medium carbon steel after ultra-fast heat treatment, consisting of heating with heating rate of 300 C/s, 2 s soaking at peak temperature and subsequent quenching. In order to better understand the microstructure evolution and the phenomena that take place during...
journal article 2019
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Kumar, A. (author), Agarwal, G. (author), Petrov, R.H. (author), Goto, S. (author), Sietsma, J. (author), Herbig, M. (author)
The formation of White (WEL) and Brown Etching Layers (BEL) on rail raceways during service causes the initiation of microcracks which finally leads to failure. Detailed characterization of the WEL and the BEL in a pearlitic rail steel is carried out from micrometer to atomic scale to understand their microstructural evolution. A...
journal article 2019
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Goulas, C. (author), Kumar, A. (author), Mecozzi, M.G. (author), Castro-Cerda, Felipe Manuel (author), Herbig, Michael (author), Petrov, R.H. (author), Sietsma, J. (author)
Atomic-scale investigation was performed on 51CrV4 steel, isothermally held at different temperatures within the bainitic temperature range. Transmission electron microscopy (TEM) analysis revealed three different morphologies: lower, upper, and inverse bainite. Atom Probe Tomography (APT) analysis of lower bainite revealed cementite...
journal article 2019
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Banis, Alexandros (author), Hernandez Duran, E.I. (author), Bliznuk, Vitaliy (author), Sabirov, Ilchat (author), Petrov, R.H. (author), Papaefthymiou, Spyros (author)
The effect of ultra-fast heating on the microstructures of steel has been thoroughly studied over the last year as it imposes a suitable alternative for the production of ultra high strength steel grades. Rapid reheating followed by quenching leads to fine-grained mixed microstructures. This way the desirable strength/ductility ratio can be...
journal article 2019
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Valdes-Tabernero, M. A. (author), Celada-Casero, Carola (author), Sabirov, I. (author), Kumar, A. (author), Petrov, R.H. (author)
This work focuses on the effect of soaking time on the microstructure during ultrafast heat treatment of a 50% cold rolled low carbon steel with initial ferritic-pearlitic microstructure. Dilatometry analysis was used to estimate the effect of heating rate on the phase transformation temperatures and to select an appropriate inter-critical...
journal article 2019
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Dimitrova, Rositza (author), Petrov, R.H. (author), Kuzmanov, Pavel (author), Velikov, Аngel (author), Manolov, Valentin (author)
Two types of A356 alloy castings in initial and modified with nanoparticles condition produced by gravitational casting were studied. Samples, as-cut from the castings, were subjected to light optical microscopy (LM), thermal analyses, Electron Backscattered Diffraction (EBSD) and Scanning Transmission Electron Microscopy (STEM) analyses....
journal article 2019
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Hajizad, O. (author), Kumar, A. (author), Li, Z. (author), Petrov, R.H. (author), Sietsma, J. (author), Dollevoet, R.P.B.J. (author)
Wheel–rail contact creates high stresses in both rails and wheels, which can lead to different damage, such as plastic deformation, wear and rolling contact fatigue (RCF). It is important to use high-quality steels that are resistant to these damages. Mechanical properties and failure of steels are determined by various microstructural...
journal article 2019
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Danielsen, H. K. (author), Gutiérrez Guzmán, F. (author), Muskulus, Michael (author), Rasmussen, B. H. (author), Shirani, M. (author), Cornel, D. (author), Sauvage, P. (author), Wu, J. (author), Petrov, R.H. (author), Jacobs, G. (author)
WEC is an aggressive and unpredictable failure mode affecting bearings in particular in the wind energy sector. This paper focuses on the most common used method for WEC laboratory accelerated testing, the FE8 type test rigs using martensitic through hardened 100Cr6 cylindrical roller thrust bearings, analyzing the load conditions, test...
journal article 2019
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Kumar, A. (author), Saxena, A. K. (author), Kirchlechner, C. (author), Herbig, M. (author), Brinkmann, S. (author), Petrov, R.H. (author), Sietsma, J. (author)
Failure in engineering materials like steels is strongly affected by in-service deleterious alterations in their microstructure. White Etching Layers (WELs) are an example of such in-service alterations in the pearlitic microstructure at the rail surface. Cracks initiate in the rails due to delamination and fracture of these layers and...
journal article 2019
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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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Eftekharimilani, P. (author), van der Aa, E.M. (author), Petrov, R.H. (author), Hermans, M.J.M. (author), Richardson, I.M. (author)
The effect of an automotive paint bake (PB) thermal cycle on the microstructural evolution and the mechanical properties of resistance spot welded advanced high strength steel is presented in this work. Mechanical behavior of the heat-treated welds reveals an increase in maximum cross-tension strength, displacement and subsequently energy...
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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Papaefthymiou, Spyros (author), Bouzouni, Marianthi (author), Petrov, R.H. (author)
In this study, UltraFast Heat Treatment (UFHT) was applied to a soft annealed medium carbon chromium molybdenum steel. The specimens were rapidly heated and subsequently quenched in a dilatometer. The resulting microstructure consists of chromium-enriched cementite and chromium carbides (in sizes between 5–500 nm) within fine (nano-sized)...
journal article 2018
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Hofer, Christina (author), Bliznuk, Vitaliy (author), Verdiere, An (author), Petrov, R.H. (author), Winkelhofer, Florian (author), Clemens, Helmut (author), Primig, Sophie (author)
The multiphase microstructure of carbide-free bainitic steels comprises bainitic ferrite laths, retained austenite with different morphologies, a minor fraction of carbides and so-called martensite-austenite areas, which partially transform during the last cooling step. While the other constituent received much attention, little is known...
journal article 2018
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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
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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
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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
Searched for: author:"Petrov, R.H."
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