Blar i NTNU Open på forfatter "Ferro, Paolo"
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A metallurgical and thermal analysis of Inconel 625 electron-beam welded joints
Romanin, Luca; Ferro, Paolo; Fabrizi, Alberto; Berto, Filippo (Journal article; Peer reviewed, 2019)Inconel 625 is a nickel-based superalloy that finds application in many industrial sectors thanks to its high strength, excellent fabricability, and outstanding corrosion resistance. It is characterized by a good weldability ... -
A novel algorithm for crack path identification based on infrared images
Romanin, Luca; Vinogradov, Alexey; Berto, Filippo; Ferro, Paolo (Journal article; Peer reviewed, 2019)The present work aims at developing a new approach towards the analysis of the crack path through the access to the information from the infrared (IR) video imaging of the steady fatigue crack growth. We first test some ... -
The effect of Equal Channel Angular Pressing on the stress corrosion cracking susceptibility of AZ31 alloy in simulated body fluid
Peron, Mirco; Skaret, Pål Christian; Fabrizi, Alberto; Varone, Alessandra; Montanari, Roberto; Roven, Hans Jørgen; Ferro, Paolo; Berto, Filippo; Torgersen, Jan (Peer reviewed; Journal article, 2020)Despite the great potential of Mg and its alloys as material for biodegradable implants, their low resistance to the simultaneous action of corrosion and mechanical stresses in the human body have hampered their use. Stress ... -
Effect of Solidification Time on Microstructural, Mechanical and Fatigue Properties of Solution Strengthened Ferritic Ductile Iron
Borsato, Thomas; Ferro, Paolo; Berto, Filippo; Carollo, Carlo (Journal article; Peer reviewed, 2019)Microstructural, mechanical, and fatigue properties of solution strengthened ferritic ductile iron have been evaluated as functions of different solidification times. Three types of cast samples with increasing thickness ... -
Effects of different production technologies on mechanical and metallurgical properties of precious metal denture alloys
Ferro, Paolo; Battaglia, Eleonora; Capuzzi, Stefano; Berto, Filippo (Journal article; Peer reviewed, 2017)Abstract: Background: Precious metal alloys can be supplied in traditional plate form orinnovative drop form with high degree of purity. Objective: The aim of the present work is to evaluate the influence of precious metal ... -
Experimental and numerical analysis of TIG-dressing applied to a steel weldment
Ferro, Paolo; Berto, Filippo; Bonollo, F.; Montanari, R (Journal article; Peer reviewed, 2018)Fatigue strength of welded joints is controlled above all by notch defects such as weld toe and weld root that act as stress concentrators. This is the reason why over the last years different post-weld fatigue improvement ... -
Fatigue assessment of semi-circular notched specimens produced by Laser Engineered Net Shaping method
Razavi, Seyed Mohammad Javad; Bordonaro, Giancarlo; Ferro, Paolo; Berto, Filippo (Journal article; Peer reviewed, 2018)As a primary failure mechanism, fatigue failure of additively manufactured metallic parts has attracted considerable attention in both aerospace and biomedical applications. According to some specific design requirements, ... -
Fatigue Assessment of Ti–6Al–4V Circular Notched Specimens Produced by Selective Laser Melting
Razavi, Seyed Mohammed Javad; Ferro, Paolo; Berto, Filippo (Journal article; Peer reviewed, 2017)Additive manufacturing (AM) offers the potential to economically produce customized components with complex geometries in a shorter design-to-manufacture cycle. However, the basic understanding of the fatigue behavior of ... -
Fatigue behavior of porous Ti-6Al-4V made by laser-engineered net shaping
Razavi, Seyed Mohammad Javad; Bordonaro, Giancarlo; Ferro, Paolo; Torgersen, Jan; Berto, Filippo (Journal article; Peer reviewed, 2018)The fatigue behavior and fracture mechanisms of additively manufactured Ti-6Al-4V specimens are investigated in this study. Three sets of testing samples were fabricated for the assessment of fatigue life. The first batch ... -
A First Approach on Modelling the Thermal and Microstructure Fields During Aluminium Butt Welding Using the HYB PinPoint Extruder
Leoni, Francesco; Grong, Øystein; Fjær, Hallvard Gustav; Ferro, Paolo; Berto, Filippo (Peer reviewed; Journal article, 2020)Hybrid metal extrusion & bonding (HYB) is a new solid-state joining method for metals and alloys that utilizes continuous extrusion as a technique to enable aluminium filler metal additions. In the HYB case, heat is generated ... -
Fracture behaviour of notched as-built EBM parts: Characterization and interplay between defects and notch strengthening behaviour
Peron, Mirco; Torgersen, Jan; Ferro, Paolo; Berto, Filippo (Journal article, 2018)Additive manufacturing (AM) offers the potential to economically produce customized components with complex geometries. However, the introduction of complex geometry goes hand in hand with the presence of notches. Thus, ... -
Microstructural and mechanical characterization of a stainless-steel wire mesh–reinforced Al-matrix composite
Ferro, Paolo; Fabrizi, A.; Bonollo, Franco; Berto, Filippo (Peer reviewed; Journal article, 2021)The microstructure and mechanical properties of stainless-steel AISI 304 wire mesh–reinforced AlSi9Cu-matrix composite specimens obtained by gravity casting were investigated. Optical and scanning electron microscope ... -
Novel method for the fatigue strength assessment of heavy sections made by ductile cast iron in presence of solidification defects
Borsato, Thomas; Ferro, Paolo; Berto, Filippo (Journal article, 2018)The fatigue strength of ferritic, pearlitic, and solution strengthened ferritic ductile irons taken from heavy sections and characterized by long solidification times has been assessed. Starting from the idea of Murakami ... -
Numerical modelling of residual stress redistribution induced by TIG-dressing
Ferro, Paolo; Bonollo, Franco; Berto, Filippo; Montanari, Alessandro (Peer reviewed; Journal article, 2019)TIG-dressing is a technique used to improve the fatigue strength of welded joints by a remelting of the weld toe region that promotes both a smoother transition between the plate and the weld crown and a residual stress ... -
Porosity effect on tensile behavior of Ti-6Al-4V specimens produced by laser engineered net shaping technology
Razavi, Seyed Mohammad Javad; Bordonaro, GG; Ferro, Paolo; Torgersen, Jan; Berto, Filippo (Journal article, 2018)Microstructural characteristics of additively manufactured Ti-6Al-4V specimens are analyzed in this study. Laser Engineered Net Shaping technology, a direct energy deposition additive manufacturing process, is used to ... -
Porosity Inducing Process Parameters in Selective Laser Melted AlSi10Mg Aluminium Alloy
Ferro, Paolo; Meneghello, Roberto; Razavi, Seyed Mohammad Javad; Berto, Filippo; Savio, G. (Peer reviewed; Journal article, 2020)Additive manufacturing techniques are known for the unrivalled geometric freedom they offer to designers. It is one of the mainstays of “metal 3D-printing”, compared to casting, which, in contrast, implies more restrictions ... -
Process Modelling Applied to Aluminium-Steel Butt Welding by Hybrid Metal Extrusion and Bonding (HYB)
Leoni, Francesco; Grong, Øystein; Celotto, Ambra; Fjær, Hallvard Gustav; Ferro, Paolo; Berto, Filippo (Peer reviewed; Journal article, 2022)In the present investigation, the numerical code WELDSIM is used to simulate butt welding of 4 mm thick plates of S355 steel and AA6082-T6 by Hybrid Metal Extrusion and Bonding (HYB). This is a new solid state joining ... -
Rapid calculation of residual stresses in dissimilar s355– aa6082 butt welds
Leoni, Francesco; Fjær, Hallvard Gustav; Ferro, Paolo; Berto, Filippo (Peer reviewed; Journal article, 2021)An analytical model is proposed to rapidly capture the thermal and residual stresses values induced by the hybrid metal extrusion and bonding (HYB) process on dissimilar-metal butt-welded joints. The power input for two ... -
Strain evolution in cold-warm forged steel components studied by means of EBSD technique
Ferro, Paolo; Bonollo, Franco; Bassan, Fabio; Berto, Filippo (Journal article; Peer reviewed, 2017)Electron BackScatter Diffraction (EBSD) in conjunction with Field-Emission Environmental Scanning Electron Microscopy (FEG-ESEM) has been used to evaluate the microstructural and local plastic strain evolution in different ... -
The influence of metallurgical data on residual stresses in Computational Welding
Romanin, Luca; Ferro, Paolo; Berto, Filippo (Journal article, 2018)Fusion welding processes are the primary joining techniques used in the fabrication of civil structures and mechanical engineering assemblies. The fusion of the parent and filler materials and the subsequent rapid cooling ...