A5014484038- Microstructure and Mechanical Properties of Steels
- Metal Alloys Wear and Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- Welding Techniques and Residual Stresses
- Metallurgy and Material Forming
- High Temperature Alloys and Creep
- High Entropy Alloys Studies
- Magnetic Properties and Applications
- Microstructure and mechanical properties
- Corrosion Behavior and Inhibition
- Metallurgical Processes and Thermodynamics
- Advanced Welding Techniques Analysis
- Aluminum Alloys Composites Properties
- Gamma-ray bursts and supernovae
- Time Series Analysis and Forecasting
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Metal Forming Simulation Techniques
- Material Properties and Applications
- Laser-induced spectroscopy and plasma
- Metal and Thin Film Mechanics
- Stellar, planetary, and galactic studies
Forschungszentrum Jülich
2022-2024
Suez University
2014-2023
RWTH Aachen University
2015-2023
Egyptian Atomic Energy Authority
2019
This work investigated the effect of friction stir welding (FSW) tool rotation rate and speed on grain structure evolution in nugget zone through thickness 10 mm thick AA5083/AA5754 weldments. Three joints were produced at different combinations FSW parameters. The texture using electron backscattering diffraction (EBSD). In addition, both hardness tensile properties investigated. It was found that size varied (NG), which reduced from top to base all welds. Reducing 600 rpm 400 a constant 60...
The increasing demand for materials possessing enhanced mechanical strength, high thermal conductivity, and excellent electrical properties has grown significantly. Cu-matrix composites, especially Cu– Ni, present a promising candidate to fulfill these demands. In this study, Cu–Ni composites were successfully synthesized using powder metallurgy with various additions (0–1.5 wt%) of Yttria (Y2O3)-reinforcement aiming enhance their mechanical, thermal, properties. microstructural...
This paper discusses the avoidance of hydrogen embrittlement (HE) in a medium manganese stainless steel X20CrNiMnVN18-5-10. We adopted HE-mitigation strategy that relies on improving its intrinsic resistance to by adjusting an ultrafine microstructure (∼1.3 µm) containing significant amount nano-sized V- and Cr-based precipitates size range 20 - ≥200 nm. The precipitation state was characterized using high-resolution scanning transmission electron microscope. Slow strain rate tests at 10−6...
Breaking the strength-ductility paradox of very-low (≤0.05 wt.%)-C medium (3–12 wt.%)-Mn steels (MMnS) has been a hard-wired topic, since in these multi-step heat treatments are usually required to obtain austenite for improved ductility and precipitates higher strength. In this study, compact two-step treatment comprising short (2 min) annealing tempering was developed investigate synergetic effect reversion nano-precipitation on tensile behavior very-low-C MMnS containing 1.5 wt.% Cu Ni....
The Photometric LSST Astronomical Time Series Classification Challenge (PLAsTiCC) is an open data challenge to classify simulated astronomical time-series in preparation for observations from the Large Synoptic Survey Telescope (LSST), which will achieve first light 2019 and commence its 10-year main survey 2022. revolutionize our understanding of changing sky, discovering measuring millions time-varying objects. In this challenge, we pose question: how well can objects sky that vary...
A novel medium manganese (MMn) steel with additions of Cr (18%), Ni (5%), V (1%), and N (0.3%) was developed in order to provide an enhanced corrosion resistance along a superior strength–ductility balance. The laboratory melted ingots were hot rolled, cold finally annealed at 1000 °C for 3 min. recrystallized single-phase austenitic microstructure consisted ultrafine grains (~1.3 µm) substantial amount Cr- V-based precipitates bimodal particle size distribution (100–400 nm <20 nm)....
The continuous casting behavior of medium manganese steels (MMnS: 6Mn, 6Mn–1Si, 6Mn–1Si–1Al, 10Mn–1Si and 10Mn–1Si–1Al) have been investigated compared with unalloyed carbon steel C30. A series in-situ melting/re-solidification hot tensile tests were conducted in the temperature range 800–1450 °C. corresponding forces ductility parameters monitored. Differential thermal analysis (DTA) was applied to determine liquidus temperatures. solidified zones fracture surfaces tested specimens analyzed...
Gold-nickel coatings (Au–Ni) were applied by electrodeposition (ED) and electroless deposition (ELD) on additively manufactured (AM) AlSi10Mg alloy to improve the electrical conductivity electrochemical behavior. Characterization of Au–Ni was performed a scanning electron microscope equipped with energy dispersive X-ray spectroscopy (EDS) x-ray diffraction study tiny features. The surface indentation hardness coated evaluated coating strength. behavior as-built part its counterpart,...
This study highlights the strengthening mechanisms observed during metal joining of high-strength grade steels (Al-TRIP and Si-TRIP) by providing a concise investigation microstructural features, mechanical strength evaluation, employing Finite Element Method (FEM) analysis to understand deformation behaviour in joint. The base metals (BMs), Al-TRIP Si-TRIP are cold-rolled sheets with thicknesses 0.9 mm 1.3 mm, respectively. contains 2.4 wt% Al, while 1.5 Si. Al-/Si-TRIP joint was processed...
Dual phase weathering (DP‐weathering) steels were developed by inter‐critical annealing treatments from a commercial hot‐rolled steel. The effects of martensite volume fraction (MVF) and microstructural changes accompanied the martensitic transformation on mechanical properties, formability, corrosion behavior investigated metallography, mechanical, testing. investigations revealed that final microstructures consisted mostly island‐shape particles impeded in ferrite matrix except for highest...
Developing medium-Mn steels (MMnS) demands a better understanding of the microstructure evolution during thermo-mechanical treatments (TMTs). This study demonstrates relationship among processing, microstructure, and mechanical properties warm-rolled steel containing 1.5 wt. % Cu Ni. After short-time warm rolling (WR) in an intercritical temperature range, significant quantity (40.6 vol.%) austenite was reverted retained after air cooling. The tensile WR specimens were compared with two...
Cosmology is one of the four science pillars LSST, which promises to be transformative for our understanding dark energy and matter. The LSST Dark Energy Science Collaboration (DESC) has been tasked with deriving constraints on cosmological parameters from data. Each probes heavily impacted by choice observing strategy. This white paper written DESC Observing Strategy Task Force (OSTF), represents entire collaboration, aims make recommendations strategy that will benefit all analyses LSST....
Two B400B-R and B500B grade rebars were industrially produced through a Tempcore process. The standard chemical composition of was additionally alloyed with 0.067 wt.% V to enhance its mechanical properties. A set optimized processing parameters applied manufacture two different diameters D20 (Ø 20 mm) D32 32 mm). microstructure -mechanical properties relationships evaluated using optical scanning electron microscopes, hardness, tensile testing. In addition, thermal model developed define...
The mechanical behaviour at high temperatures and the corresponding microstructural characteristics of a newly developed high-performance ferritic, salt-corrosion-resistant (HiperFerSCR) steel containing Laves phase particles were studied to investigate active deformation mechanisms evolution damage. A series tensile tests conducted both room temperature elevated (550, 600, 650 °C), along with detailed analyses using scanning electron microscopy backscatter diffraction. flow HiperFerSCR...
Sodium batteries are attractive candidates for medium to large scale stationary energy storage applications. While high-temperature Na-NiCl (Zebra batteries) have been in commercial use decades, intensive research is...
We review the measurements of dark energy enabled by observations Deep Drilling Fields and optimization survey design for cosmological measurements. This white paper is result efforts LSST DESC Observing Strategy Task Force (OSTF), which represents entire collaboration, aims to make recommendations on observing strategy DDFs that will benefit all analyses with LSST. It accompanied DESC-WFD (Lochner et al.). argue altering nominal deep drilling plan have $>6$ month seasons, interweaving $gri$...