EFFECTS OF ROLLING SPEED ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AL-1050-H4 DURING ACCUMULATIVE ROLL BONDING (ARB)

The aim of the study was to investigate the effects of rolling speed on microstructure and mechanical properties of AL- 1050-H4 alloy during deformation by accumulative roll bonding. Samples were rolled at three different rolling speeds (9, 18 and 36 rpm) for single pass. Samples were annealed at 550˚C for 30 mins and air cooled. Light Optical Microscope (LOM) was used to get micrographs. During sample characterization, linear intercept method ASTM E112 standard was adopting. micro-hardness test was performed on un-rolled and rolled sample using ASTM E384 test method. Significant grain refinement was noticed from microstructure of sample rolled at higher speed (36 rpm) and was reported to be 46.6 µm. Un-rolled sample was the softest with a hardness of 40.3 HV. Accumulative roll bonding enhanced AL-1050-H4 as maximum hardness (49 HV) was obtained on a sample rolled at 36 rpm. Material hardness was increased by 18% at single pass in this study.