TJ905 : Investigating drawability characteristics and mechanical properties of mextallic sheets processed by accumulative roll bonding
Thesis > Central Library of Shahrood University > Mechanical Engineering > MSc > 2022
Authors:
Amirhasan Fadaeizadeh [Author], Mahdi Gerdooei[Supervisor], Mohsen Karimi[Advisor]
Abstarct: Nowadays, nanostructured materials have attracted a lot of attention due to their unique mechanical properties. Various methods have been invented to produce these materials. One of the most important of these methods is the Severe Plastic Deformation (SPD). The prominent feature of these processes is that the dimensions of the sample remain constant during the process, as a result of which it is possible to apply very high strains on the material. Accumulative Roll Bonding (ARB) is one of the methods of severe plastic deformation. In this thesis, ARB process up to 6 passes is performed on aluminum 1050 sheet. Dealing with the production characteristics of the ARB process, the deep drawing approach was considered to examine the drawability of the specimens. The results showed that the ultimate strength of the produced sheets increases significantly until the third pass, and after that, this increase continues with a slight slope and finally decreases in the sixth pass. Also, the elongation decreases in the first pass compared to the as-received sample significantly and increases slightly after the second pass. Next, to study the effect of stress relief annealing heat treatment, the ARB samples were heated to 200°C for 30 minutes before the deep drawing process, then cooled at ambient temperature. Also, to achieve greater drawability, the radius of the mandrel corner was increased from 3 mm to 6 mm, and 8 laxyers of nylon were used as lubricants. The results showed that by this modification the depth of the cups increases significantly compared to that of original ARB samples, so that the cup depth after third pass ARB with modified set-up increased from 9.78 mm to 27.14 mm.
Keywords:
#Severe Plastic Deformation #Accumulative Roll Bonding #deep drawing #formability #drawability #anisotropy Keeping place: Central Library of Shahrood University
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