Abstract
In the current study, the effect of deep cold rolling (DCR) as a mechanical surface treatment on the surface quality of C38500 brass alloy is investigated. To this end, the surface roughness and hardness of the raw material is measured firstly using the roughness and hardness tester. A simple tool is designed and fabricated for performing the treatments using surface pressure induced by a small ball. DCR process is accomplished by different kinds of balls to determine the effects of ball hardness on the surface roughness and hardness. Then roughness and hardness tests are carried out for the treated specimens. Results show about 93% and 8.4% improvement for surface roughness and hardness regarding to best conditions, respectively. Also, subsurface hardness shows this treatment can shift the hardness curves to higher values. It is also obtained that different materials for ball and its surface quality as well as different rolling depths caused various results. The minimum surface scratches (roughness) of ball leads to high quality treated specimen. Higher ball hardness causes as well more deformation on the surface of specimen similar to higher rolling depth.
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