The effect of melt superheat and oxide inclusions on the fluidity a commercial A356 alloy has been investigated. Fluidity measurements have performed by means Archimedean spiral in sand moulds. specific testing method experimental apparatus show good reproducibility. Metallographic image analysis techniques used to quantitatively examine microstructural changes amount defects occurring at tip spirals. results reveal that films increase variability obtained same apparent conditions. A long...

This work is aimed to develop and optimize a gas ferritic oxynitrocarburizing treatment applied an industrial 16MnCr5 component. The main effort has been reduce the time consumption by using nitriding atmosphere that comprises nitrous oxide ammonia. Special attention paid improve salt spray corrosion resistance with respect hardness requirements whole compound zone depth. Several changes have base modifying temperature of each process phase, as well mixture flow nitrocarburizing atmosphere....

The microstructure resulting from a gaseous multistage nitrocarburising treatment applied to 16MnCr5 steel has been investigated study the microstructural evolution during process and effects of severe plastic deformation. depth compound layer porous zone measured by optical microscopy. means scanning electron microscope equipped with both an backscatter diffraction detector, assess amount distribution nitrogen nitrides, energy-dispersive X-ray microanalysis reveal N diffusion depth....

The precipitation of primary Fe-rich intermetallics ( sludge ) in AlSi9Cu3(Fe) type alloys has been investigated for different Fe, Mn and Cr contents cooling rates. Differential scanning calorimetry was used order to assess the nucleation temperature enthalpy particles as well follow their evolution. results show that release latent heat during formation are functions initial concentrations molten alloy, i.e. factor , rate. Being able predict will support foundries set right metal prevent...

We show that the set of aggregate choices a population rational decision-makers - random utility models (RUMs) can be represented by irrational ones if, and only their preferences are sufficiently uncorrelated. call this representation: Irrational RUM. then almost all RUMs in which at least some under specific conditions behavior is unconstrained.

Abstract We study the relationship between imperfect discrimination, similarity, and stochastic transitivity in generalized versions of Perturbed Utility (Fudenberg et al. Econometrica 83(6):2371–2409, 2015) Fechnerian models (Debreu 26(3):440–444, 1958). show that these are equivalent that, within them, properties a similarity function can characterize all notions (as Weak, Moderate, Strong). Specifically, He Natenzon (Am Econ Rev Insights 6(2):176–195, 2024) have recently shown choice...

Gas nitrocarburizing combined with a post-oxidation treatment is an interesting industrial process developed in order to improve wear and corrosion resistance of low alloyed steel components. In the present work, microstructure resulting by thermochemical treatment, which comprises nitriding, stages, applied 16MnCr5 component, has been studied. Both nitriding temperatures were systematically changed study phases compound layer. The depth layer have measured optical microscopy evaluate effect...