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1 2007

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Badania doświadczalne wpływu temperatury walcowania na własności mechaniczne taśm aluminiowych w procesie walcowania pakietowego ARB

Kwapisz M., Svyetlichnyy D. S., Milenin A.

Rudy i Metale Nieżelazne

2007

R. 52, nr 5

272-275

W artykule przedstawiono wyniki badań doświadczalnych walcowania pakietowego aluminium, przeprowadzonych na walcarce laboratoryjnej Politechniki Częstochowskiej, oraz wpływu temperatury walcowania na własności mechaniczne aluminium o ultradrobnoziarnistej strukturze. W pracy przedstawiono wyniki badań umownej granicy plastyczności, wytrzymałości na rozciąganie, wydłużenia całkowitego, mikrotwardości oraz siły walcowania.

Recently an interest in materials with ultra-fine structure arouses constantly. Among the several methods of severe deformation that allows for obtaining such a structure accumulative roll-bonding (ARB) process is well placed. The ARB process is a one that can be fitted for mass bulk production. The cycle of Accumulative Roll-Bonding process consists of several stages: cutting of the strip, surfaces cleaning and degreasing, putting into a packet two or more strips, and rolling the packet with reduction, which gives the same sizes of the strip as before the cutting. Repeating of the several cycles is carried out in order to obtain severe deformation, which results on receiving of ultra-fine microstructure of aluminum and unique mechanical properties. In the paper, results of experimental study of the accumulative roll-bending process of aluminum strips are presented. The general difference of the ARB process, which has been carried out on laboratorial stand in Częstochowa University of Technology, is a rolling in bracket grooves. Such a modification make possible to realize more passes and to study properties of aluminum under more severe deformation. For the better bonding during the rolling, the metal before deformation is reheated. The rolling temperature effects on the microstructure development and mechanical properties of aluminum, as well. Results of measurements of the yield strength, ultimate tensile strength, elongation, microhardness and rolling force are shown in the paper. The yield strength, ultimate tensile, microhardness and rolling force arise in the several first passes, and then after short stabilization, their values decrease slightly. Elongations demonstrate reverse dependence: after decided drop and stabilization increasing come on. Basing on obtained results, a model that describes a microstructure evolution and mechanical properties during the accumulative roll-bonding process will be developed.