RP
Authored
16 records found
Details of pearlite to austenite transformation in steel
Experiments and phase-field modeling
The austenitization of an initial pearlitic microstructure is simulated using the phase field model to achieve insight into White Etching Layer (WEL) formation in pearlitic railway steels. The simulations take into account the resolution of the cementite lamellae within a pearlit
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Microstructure evolution of medium‑manganese Al-alloyed steel manufactured by double-step intercritical annealing
Effects of heating and cooling rates
A novel double-step intercritical annealing (DSIA) process was conducted on Fe-0.16C-4.7Mn-1.6Al-0.2Si transformation induced plasticity (TRIP) steel. In a present study, an effect of different heating and cooling rates applied to the second intercritical annealing (IA) step on t
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The effect of ultrafast heating on cold-rolled low carbon steel
Formation and decomposition of austenite
The effect of heating rate on the formation and decomposition of austenite was investigated on cold-rolled low carbon steel. Experiments were performed at two heating rates, 150 ˚C/s and 1500 ˚C/s, respectively. The microstructures were characterized by means of scanning electron
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Continuous and pulsed selective laser melting of Ti6Al4V lattice structures
Effect of post-processing on microstructural anisotropy and fatigue behaviour
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 lat
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The effect of ultrafast heating in cold-rolled low carbon steel
Recrystallization and texture evolution
The microstructure and texture evolution of cold-rolled low carbon steel after ultrafast heating and quenching is investigated. Experiments were carried out at heating rates of 150 °C/s and 1500 °C/s. The recrystallization of ferrite is studied by scanning electron microscopy and
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“Brown etching layer”
A possible new insight into the crack initiation of rolling contact fatigue in rail steels?
A field sample of rail steel was metallurgically examined to characterize its rolling contact fatigue (RCF) damage. In addition to the well-known white etching layer (WEL), a possible different type of surface modification layer was identified in parallel. The layer has some simi
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“Flash” annealing in a cold-rolled low carbon steel alloyed with Cr, Mn, Mo, and Nb
Part II—Anisothermal recrystallization and transformation textures
The aim of the present investigation is to study the microstructure and texture evolution in a cold-rolled low carbon steel subjected to continuous heating and subsequent quenching. Peak-annealing and quenching experiments are carried out at different temperatures at three heatin
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‘Flash’ annealing in a cold‐rolled low carbon steel alloyed with Cr, Mn, Mo, and Nb
Part I ‐ Continuous phase transformations
The aim of the present work is to study the microstructure evolution of a
cold‐rolled low carbon steel alloyed with Cr, Mn, Mo, and Nb during
continuous heating. The formation of austenite and its further
transformation is examined by means of peak annealing experiments at
th
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Advanced high strength steels
Improved properties by design of textures and microstructures
Texture and microstructure formation during annealing of a 75% cold rolled AHS steel, reheated at a rate of 10°C/s to ~3000°C/s were studied with the purpose to investigate the interaction between the recrystallization and the austenite formation as well as the possibility of gra
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An interdisciplinary framework to predict premature roller element bearing failures in wind turbine gearboxes
Ein interdisziplinärer Rahmen zur Vorhersage vorzeitiger Lagerausfälle von Rollenelementen in Windkraftanlagen
Roller element bearings present in the intermediate and high-speed stages of wind turbine gearboxes operate in dynamic working conditions and in some cases may fail within 30% or less of their designed lifetime. Upon investigation, it has been identified that these premature fail
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An interdisciplinary framework to predict premature roller element bearing failures in wind turbine gearboxes
Ein interdisziplinärer Rahmen zur Vorhersage vorzeitiger Lagerausfälle von Rollenelementen in Windkraftanlagen
Roller element bearings present in the intermediate and high-speed stages of wind turbine gearboxes operate in dynamic working conditions and in some cases may fail within 30% or less of their designed lifetime. Upon investigation, it has been identified that these premature fail
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Evolution of recrystallization textures in particle containing Al alloys after various rolling reductions
Experimental study and modeling
The phase transformations, microstructure and properties of two Medium-Mn processed via quenching and partitioning steels were compared in this contribution and a new strategy for controlling mechanical properties by introducing and controlling cold-worked ferrite prior to heat t
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The strengthening via precipitation of nano-sized κ-carbides leads to exceptional strength-ductility balance in low-density steels. During aging, such nanocarbides form through spinodal decomposition by fluctuations in the aluminum and carbon content in the austenite, followed by
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Rolling and annealing is a crucial technology to produce electrical steel sheets. This technology is not just aimed to control the geometry of steel sheets but more importantly to enhance the magnetic properties of the final products via appropriate microstructure and crystallogr
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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 scal
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Contributed
4 records found
Wire Arc Additive Manufacturing (WAAM), one of the Additive Manufacturing (AM) deposition methods which employs the basic principles of Gas Metal Arc Welding (GMAW) welding technique was used to show that it is possible to build moulds for ceramic products using AISI 420 stainles
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Wind turbine (WT) gear boxes are prone to failure well below the expected 20 years’ lifetime of a WT. It has been identified that most of the failures observed are due to white etch crack flaking. Although this type of failure has been intensely studied, the underlying mechanisms
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Railway transport plays a vital role in a country’s economic growth. Derailments result in loss of life, damage to rolling stock, service disruptions and harm the environment leading to the decrease in economic growth of a country. Improving train operating safety has been a high
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This thesis is a comparative study of the Thermo-Mechanical Fatigue (TMF) performance of different grades of SiMo nodular cast iron for heavy-duty diesel engine exhaust gas manifold applications. The TMF performance of the current SiMo variant used to manufacture exhaust manifold
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