A5091800617- Metal Alloys Wear and Properties
- Powder Metallurgy Techniques and Materials
- Advanced materials and composites
- Microstructure and Mechanical Properties of Steels
- Metallurgy and Material Forming
- Aluminum Alloy Microstructure Properties
- Injection Molding Process and Properties
- Metal and Thin Film Mechanics
- Hydrogen embrittlement and corrosion behaviors in metals
- Advanced machining processes and optimization
- Aluminum Alloys Composites Properties
- Fatigue and fracture mechanics
- Corrosion Behavior and Inhibition
- Metal Forming Simulation Techniques
- High Temperature Alloys and Creep
- Solar Thermal and Photovoltaic Systems
- Material Properties and Applications
- Non-Destructive Testing Techniques
- Structural Load-Bearing Analysis
- Material Properties and Failure Mechanisms
- Advanced Battery Materials and Technologies
- Advanced Surface Polishing Techniques
- Metallurgical Processes and Thermodynamics
- Tribology and Wear Analysis
- Advancements in Battery Materials
Politecnico di Milano
2013-2024
Independent Dance
2021
Sapienza University of Rome
1984
In additive manufacturing, despite its several indisputable advantages, detrimental variables to fatigue strength still remain poor surface finishing and porosities. However, because the majority of defects locate close surface, their mechanical removal is expected appreciably improve strength. Considering SLMed 316L, fully-reversed rotating-bending tests in both as-built machined conditions are performed. Fatigue failures discussed using Kitagawa-Takahashi diagram. each condition, stress...
Two new absorber coatings for mid-temperature operation (300–350 °C) in collectors solar thermal electricity plants are presented this study. The absorbers consist of two cermet layers either W–SiO2 or Nb–TiO2, deposited on a molybdenum infrared reflector and coated with an antireflection layer silicon oxide. optimization the optical performance was made steps. First, structure optimized model calculations. constants used modelling were derived directly from sputtered films constituents...
In the as-annealed condition, nickel-based Alloy 625 has excellent mechanical and corrosion properties compared to those of common stainless steels. This peculiarity enables its exploitation in several industrial fields at cryogenic high temperatures presence severely corrosive atmospheres. However, this alloy, when high-temperature plastic deformation processes heat treatments are not carefully optimized, occurrence excessive grain coarsening can irremediably deteriorate strength, possibly...
In industrial practice, it is known that the wire rod coils need to be descaled before drawing. Acid pickling by hydrochloric or sulphuric acidic solutions most common method. However, mechanical descaling could preferred. According this choice, oxides type and morphology shall different. The nature can controlled Stelmor parameters, is, temperature at laying head cooling rate on conveyor. International standards customer specifications prescribe precise requirements not only for scale...
The characteristics of copper sulfide cathodes have been evaluated in typical organic electrolyte lithium batteries. behavior (chalcocite), (digenite), and (covellite) is discussed terms mechanism reaction, discharge properties, energy content. In view possible use primary, voltage‐compatible batteries, shows the most interesting performance, both constancy operational voltage rates.
Abstract The development of non-toxic, biodegradable vegetable oils as alternatives to petroleum derived quenchants and their influence on residual stresses dimensional changes AISI 4140 H13 modified C-ring steel test specimens is discussed. were quenched in 6 different oil blends based soybean the results compared 2 commercially available quenchants. Residual determined by X-ray analysis cylindrical after quenching. Some measurements also performed using hole-drilling method confirm...
The present work describes the realization of a modular 1-3 kWe, 3-9 kWth micro Combined Heat and Power (m-CHP) system based on innovative Concentrated Solar (CSP) Stirling engine technology. cogeneration energy at distributed level is one leading argument in large part policies related to renewable resources systems. This CSP m-CHP will provide electrical power, heating cooling for single multiple domestic dwellings other small buildings. developed integrates small-scale concentrator optics...
AbstractFour grades of sinter hardening materials have been compared, using industrial equipment. Three powder types were completely prealloyed; the last one was a hybrid, combining prealloying and diffusion bonding. Different amounts Cu added by mixing. The lubricated mixes, containing 0.6% graphite, compacted at different pressures, to form gears green densities ≥7.0 g cm−3 ; compacts sintered 1120°C, under endogas from methane fast cooled (at least 7 K s−1 within range 850–400°C). final...
The effect of a physically vapor deposited (PVD) WC/C coating on the fatigue behavior as produced and foreign object damaged (FOD) solution heat treated aged 7075 aluminum alloy was studied. Coated uncoated samples were tested under rotating bending to determine strengths between 104 106 cycles in both smooth condition. FOD with single shots small hard steel spheres impacting at 100 m/s minimum cross section. SEM used characterize features fracture surfaces.
The effect of shot peening treatment on sintered steels plates were analyzed in terms micro-structural and mechanical properties residual stress profiles. Two high performances powder metallurgy considered: the former was obtained starting from diffusion bonded powders, whereas latter pre-alloyed powders. different nominal densities considered, 6.9g/cm3 7.1g/cm3. After a preliminary optimization, two shoot cycles selected carried out investigated materials. Residual stresses after measured...
Spheroidizing annealing is commonly carried out to increase the deformation capability of hot rolled steels. In this work, influence heat treatments at 690°C and 720°C was studied on a low-carbon boron steel. The aim work relate mechanical characteristics as-spheroidized steel with as prior microstructures spheroidizing parameters. paper suggests tool for selecting best combination microstructure parameters (temperature time) obtain requested deformability. Microstructure were varying...