| Autor: |
Mahmoud ERI; Department of Mechanical Engineering, Islamic University of Madinah, Medina 42351, Saudi Arabia.; Central Metallurgical Research and Development Institute (CMRDI), Cairo 11421, Egypt., Almohamadi H; Department of Chemical Engineering, Islamic University of Madinah, Medina 42351, Saudi Arabia., Aljabri A; Department of Mechanical Engineering, Islamic University of Madinah, Medina 42351, Saudi Arabia., Khan SZ; Department of Mechanical Engineering, Islamic University of Madinah, Medina 42351, Saudi Arabia., Saquib AN; Department of Mechanical Engineering, Islamic University of Madinah, Medina 42351, Saudi Arabia., Farhan M; Department of Mechanical Engineering, Islamic University of Madinah, Medina 42351, Saudi Arabia., Elkotb MA; Mechanical Engineering Department, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia.; Mechanical Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafr El Sheikh 33516, Egypt. |
| Abstrakt: |
Friction Stir Processing (FSP) was used to fabricate metal matrix composite, based on steel and reinforced with nano-sized yttrium oxide powder. The powder was packed in a narrow longitudinal groove of 2 mm depth and 1 mm width cut in the steel plate's rear surface. Different rotation speeds of 500-1500 rpm were used, at a fixed traveling speed of 50 mm·min -1 . Single-pass and two passes, with the same conditions, were applied. The direction of the second pass was opposite to that of the first pass. After the first pass, complete nugget zones were obtained when the rotation speeds were more than 700 rpm with some particles agglomeration. The added particles showed as narrow elliptical bands, with a band pitch equal to the rotation speed over traveling speed. Performing the second FSP pass in the opposite direction resulted in better particles distributions. Almost defect-free composite materials, with homogenously distributed yttria nano-sized particles, were obtained after two passes when rotation speeds more than 700 rpm were used. The resulting steel matrix grains were refined from ~60 μm of the base metal to less than 3 μm of the processed nugget zone matrix. The hardness and the tensile strength of the fabricated materials improved almost two-fold over the base metal. Uniform microhardness values within the nugget areas were observed at higher rotational speeds. The ductility and toughness of the fabricated composites were reduced compared to the base metal. |
