A5053174864- Microstructure and Mechanical Properties of Steels
- Metallurgy and Material Forming
- Metal Forming Simulation Techniques
- Microstructure and mechanical properties
- Metal Alloys Wear and Properties
- Advanced Materials Characterization Techniques
- High Temperature Alloys and Creep
- Additive Manufacturing Materials and Processes
- Hydrogen embrittlement and corrosion behaviors in metals
- Magnetic Properties and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Metallic Glasses and Amorphous Alloys
- Aluminum Alloys Composites Properties
- Shape Memory Alloy Transformations
- Aluminum Alloy Microstructure Properties
- Additive Manufacturing and 3D Printing Technologies
- Non-Destructive Testing Techniques
- Metal and Thin Film Mechanics
- High Entropy Alloys Studies
- Innovations in Concrete and Construction Materials
- Material Properties and Failure Mechanisms
- Metallurgical Processes and Thermodynamics
- Copper Interconnects and Reliability
- Scientific Research Methodologies and Applications
Imperial College London
2020-2023
Impression Technologies (United Kingdom)
2019-2021
Coventry (United Kingdom)
2019-2021
Ruhr University Bochum
2011-2018
Kumamoto University
2010-2013
Materials Science & Engineering
2013
Tohoku University
2007-2012
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2006
University of Cambridge
2005
Additive Manufacturing (AM) processes, also known as 3D printing, enable geometrically complex parts to be produced layer by on the basis of three-dimensional (3D) data generated either scanning physical objects or using design software. Compared conventional manufacturing AM offers elimination production steps, allowing rapid and relatively easy prototyping from model designs, reproduction existing objects. Over last two decades, processes have become widespread for complex-shaped...
Extrusion-based additive manufacturing (AM) has recently become widespread for the layer-by-layer fabrication of three-dimensional prototypes and components even with highly complex shapes. This technology involves extrusion through a nozzle by means plunger-, filament- or screw-based mechanism; where necessary, this is preceded heating feedstock material to reduce its viscosity sufficiently facilitate extrusion. AM offers greater design freedom, larger building volumes more cost-efficient...
Mitigation of embrittlement caused by recrystallization and radiation is the key issue tungsten (W) based materials for use in advanced nuclear system such as fusion reactor applications. In this paper, our nanostructured W development performed so far to solve reviewed, including new original data. Firstly, basic concept mitigation shown. The approach has yielded ultra-fine grained, recrystallized (UFGR) W(0.251.5)mass%TiC compacts containing fine TiC dispersoids (precipitates). UFGR...
In the past decade, aluminum alloys have become important structural materials in automotive industry, thanks to their low density, high strength, fracture toughness, and good fatigue performance. However, an limitation of is poor formability at room temperature; as a result, numerous studies been conducted with aim developing forming techniques overcome this facilitate more complex‐shaped components. Following overview on metallurgical background alloys, article reviews recent developments...
High‐resolution characterization techniques are combined with thermodynamic calculations (CALPHAD) to rationalize microstructural features of single crystal Ni‐base superalloys. Considering the chemical compositions dendritic and interdendritic regions one can explain differences in γ′‐volume fractions. Using explain, why γ‐nanoparticles observed central large cuboidal γ′‐particles tertiary γ′‐nanoparticles form γ‐channels. The γ‐channels newly formed γ‐particles differ because Gibbs–Thomson...
Transformations from austenite to martensite or bainite in ferrous alloys have great technological importance, but some aspects remain elusive. The orientation relationship (OR), morphology and habit plane can vary considerably one system another. Much published work considers these OR terms of their variation named relationships such as Kurdjumov–Sachs Nishiyama–Wassermann. We discuss here, instead, the use a set angular parameters based on classic Kurdjumov Sachs 1930s, that provide...
In the present work, we use an advanced EBSD method to analyze two prominent types of martensite microstructures that are found in binary Fe-Ni system, lath (27.5 at.% Ni) and plate (29.5 Ni). We modify, document, apply analytical procedure, which was originally proposed by Yardley Payton, 2014. It analyzes distributions three KSI-angles (ξ1, ξ2, ξ3, KSI after Kurdjumov Sachs), describe small angular deviations between crystal planes unit cells austenite—which related through specific...
Medium manganese (MMn) steels are a promising class of advanced high-strength (AHSS) with potential for application as vehicle panels in the automotive industry. In this study, deformation behaviour representative cold-rolled MMn steel and its dependence on processing parameters studied using uniaxial tensile testing under low-temperature hot stamping (LTHS) conditions, covering austenitisation soaking times 60–600 s, temperatures 500–700 °C strain rates 0.01–5 s−1. A yield point phenomenon...
In the binary Fe-rich Fe-Ni system, martensite start temperatures MS decrease from 500 to 200 K when Ni concentrations increase 20 30 at.%. It is well known that alloys with below 28.5 at.% exhibit lath (LM) microstructures (athermal transformation, small crystals, accommodation by dislocations). Above this concentration, plate (PM) forms (burst-like large twins). The present work based on a combination of (i) ingot metallurgy for manufacturing varying Ni-concentrations, (ii) thermal...
Medium-Mn (MMn) steels have received much research attention recently because their low austenitisation temperature enables low-temperature hot stamping (LTHS). However, the effect of initial state material on performance is still unknown. In this study, different states deformation behaviour a typical MMn steel during uniaxial tensile testing under LTHS conditions (deformation at 500–600 °C strain rates 0.01–1 s−1) are investigated using Gleeble 3800 materials simulator; final mechanical...
Tempered martensite ferritic steels exhibit a complex, hierarchical microstructure. Previous work has demonstrated the utility of electron backscatter diffraction (EBSD) analysis methods to classify crack and cavitation sites in terms substructural units their boundaries. However, manual, interactive application such is time consuming. The open-source MTEX toolbox for MATLAB allows scripting automation EBSD data procedures. Here we present validation MTEX-based identification prior austenite...
The fine microstructure resulting from the martensitic transformation drives many of desired mechanical properties for quench-and-temper steels. scale martensite features correlates with austenite grain size, such that finer grains produce structures. Measuring prior (PAG) size observations hierarchical structure using etch-based techniques remains challenging, especially fine-grained specimens low C and P content. This has driven an interest in our field reconstructing electron backscatter...
Thermo-mechanical uniaxial tensile testing is commonly carried out to characterise the mechanical properties of materials under conditions which mimic advanced industrial forming processes, such as hot stamping steels and aluminium alloys, generate microstructures for metallographic investigation. However, in this type testing, heat loss specimen grips can lead nonuniform temperature distributions along gauge length, resulting challenges determining absolute values at nominal interest. The...