1,721,085 research outputs found
Alien Registration- Leo, Paola (Rockland, Knox County)
Full text linkhttps://digitalmaine.com/alien_docs/14402/thumbnail.jp
Hot deformation behaviour of an AS21X magnesium alloy produced by high pressure die casting
No full textHot rolling: mechanical, microstructural, modeling, simulation for both ferrous and light metals
Full text linkSaldatura Laser di Leghe di Titanio e Alluminio
No full textLa saldatura del titanio è largamente diffusa nei vari settori dell’industria metalmeccanica e aerospaziale. Negli ultimi anni è aumentata la necessità di saldare il titanio ad altre leghe leggere ferrose e non come l’alluminio. Le maggiori difficoltà nella saldatura eterogenea del titanio sono dovute alla formazione di un ossido superficiale che si può opporre alla fusione o alla saldobrasatura con metalli dissimili.
In questa memoria sono riportati i risultati relativi alla saldatura con laser a fibre del titanio Ti6Al4V con una lega d’alluminio 5754. I due metalli sono saldati mediante un irraggiamento laser della superficie del titanio in prossimità del giunto con l’alluminio. Quest’ultimo fonde a causa dell’onda di calore che si trasmette dalla zona fusa del titanio verso l’alluminio. La caratterizzazione metallurgica e meccanica del giunto dimostra la possibilità di arrivare così a un giunto di qualità accettabile senza particolari preparazioni delle superfici a contatto
Hot rolling: mechanical, microstructural, modeling, simulation for both ferrous and light metals
Full text linkThe dimensions, speed and complexity of rolling mills have been advancing with understanding of the
mechanics and augmented calculating power. However, the metallurgical mechanisms both during the passes
and between them are significant for stresses, defect avoidance and product properties. With facile ability
to examine microstructures at end of any pass or interval, physical simulation of multistage rolling has been
achieved in torsion, as well as in plane strain compression; while the former excels in number of passes and
total strains ε, the latter can provide texture information. However, for product mechanical properties, torsion
only permits hardness of the surface layer while plane strain specimens would permit tension or bending.
From dependencies on strain, strain rate and temperature T of stresses and microstructure for Al alloys,
C/HSLA/tool steels and ferritic/austenitic alloys, the dependence on microstructural mechanisms during
straining and unloaded intervals can be clearly defined and related to rolling forces and power demands. The
effects of solute, particles and lattice dependent dislocation mobility can provide understanding of broad
range of industrial requirements for product properties. For C/HSLA steels, there is the added complexity of
adding a cooling procedure that ensures planned phase transformations. For Al alloys and stainless steels,
the final cooling schedule can be arranged to provide prevention of, or any degree of static recrystallization,
with control of grain size and degree of isotropy. The multistage rolling simulations combined with
examination by optical microscopy OM, TEM and SEM-OIM improve process controls and product properties
‘Effetto dei trattamenti termici sulle proprietà e sui meccanismi di danneggiamento di leghe di Al thixocolate’
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’Analysis of microstructure and mechanical properties of aluminium alloys severely deformed by ecap’
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