A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Microstructure evolutions after friction stir welding of severely deformed aluminum sheets
Highlights ► Increasing of heat input has different effects on the 1 and 2 passes CGPed samples. ► Recrystallization in HAZ is increased with increasing of heat input and strain. ► For CGPed samples both elongated and recrystallized grains are formed at TMAZ. ► Thermal instability is increased with increasing of strain imposed during CGP.
Abstract The microstructure evolutions of severely deformed aluminum sheets by Constrained Groove Pressing (CGP) after Friction Stir Welding (FSW) are investigated. To do so, the specimens are deformed in three different strains using CGP process which make different the initial microstructures. Then, the specimens are joined at various revolution pitches (traveling speed/rotation speed ratio) of 0.20, 0.25 and 0.33mm/r. To understand the effect of initial strains on the properties of joints, the microhardness measurements and microstructure investigations of different areas from retreating to advancing sides of the joints are carried out. The results achieved from FSW of CGPed samples are compared with those achieved from FSW of as-annealed ones (0 pass). It is found that in contrast to 2 passes CGPed specimens, for specimens strained by 1 pass of CGP process after FSW at low revolution pitch, the grain size at the center of stir zone is finer than that at around of stir zone center. Also, it is revealed that for CGPed samples in contrast to as-annealed ones, some recrystallized grains are formed in HAZ. Moreover, the amount of recrystallized grains in HAZ is different at advancing and retreating sides.
Microstructure evolutions after friction stir welding of severely deformed aluminum sheets
Highlights ► Increasing of heat input has different effects on the 1 and 2 passes CGPed samples. ► Recrystallization in HAZ is increased with increasing of heat input and strain. ► For CGPed samples both elongated and recrystallized grains are formed at TMAZ. ► Thermal instability is increased with increasing of strain imposed during CGP.
Abstract The microstructure evolutions of severely deformed aluminum sheets by Constrained Groove Pressing (CGP) after Friction Stir Welding (FSW) are investigated. To do so, the specimens are deformed in three different strains using CGP process which make different the initial microstructures. Then, the specimens are joined at various revolution pitches (traveling speed/rotation speed ratio) of 0.20, 0.25 and 0.33mm/r. To understand the effect of initial strains on the properties of joints, the microhardness measurements and microstructure investigations of different areas from retreating to advancing sides of the joints are carried out. The results achieved from FSW of CGPed samples are compared with those achieved from FSW of as-annealed ones (0 pass). It is found that in contrast to 2 passes CGPed specimens, for specimens strained by 1 pass of CGP process after FSW at low revolution pitch, the grain size at the center of stir zone is finer than that at around of stir zone center. Also, it is revealed that for CGPed samples in contrast to as-annealed ones, some recrystallized grains are formed in HAZ. Moreover, the amount of recrystallized grains in HAZ is different at advancing and retreating sides.
Microstructure evolutions after friction stir welding of severely deformed aluminum sheets
Sarkari Khorrami, M. (author) / Kazeminezhad, M. (author) / Kokabi, A.H. (author)
2012-04-07
9 pages
Article (Journal)
Electronic Resource
English
Microstructure evolutions after friction stir welding of severely deformed aluminum sheets
| British Library Online Contents | 2012
Mechanical properties of severely plastic deformed aluminum sheets joined by friction stir welding
| British Library Online Contents | 2012
The effect of SiC nanoparticles on the friction stir processing of severely deformed aluminum
| British Library Online Contents | 2014
| British Library Online Contents | 2014