Miren Sarasola, Bachelor of Physics Science and researcher of the Materials Department at CEIT, has developed dense high performance low alloy PM steels by liquid phase sintering. The Thesis title is : "Development of dense high performance low alloy PM steels by liquid phase sintering".
The master alloy concept as a mean for obtaining high density low alloyed PM steels was revisited. In a first instance, several master alloys previously reported in the literature, were reproduced in order to carry out experimental sintering trials with the aim of understanding the behaviour of these master alloys, mixed in predetermined proportions, with a selection of Fe-based powders. As a secondary objective the accuracy of theoretical predictions based on ThermoCalc calculations was compared against the reported experimental data. A conjunction of this information with additional experiments tending to determine the diffusion paths and rates of a diversity of elements in multicomponent Fe-based systems was used for identifying adequate alloy additions supported by a computer aided alloy design approach.
On these bases, several mater alloys have been specifically designed, under metallurgic and thermodinamic criterion, to provide the formation of wetting liquid phases at low temperature and also, attractive mechanical properties of the steels. The as-sintered density and properties of the alloys is determined by the amount and type of master alloy used, total carbon content, the sintering temperature and time. The performance of the master alloys during sintering is shown for several commercially available Fe-based powders. The microstructural development of the steels is determined, both, by the chemical composition of the Fe-based powder and the chemical reactions taking place between the Fe and the master alloy particles during high temperature sintering. The influence of alloying and the sintering conditions on the final microstructure, density and mechanical properties is also discussed.
Irati Kortabitarte | alfa
Further Improvement of Qubit Lifetime for Quantum Computers
09.12.2016 | Forschungszentrum Jülich
Electron highway inside crystal
09.12.2016 | Julius-Maximilians-Universität Würzburg
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine