Abstract
In this paper, experimental results about hardness and phase composition of surface layer of AISI 304L SS, machined by using ball burnishing process, conducted under a new kinematic scheme, are presented. The effect of different combinations of the process regime parameters on the amount of strain induced martensitic phase, is discussed. The amounts of austenitic and strain induced martensitic phases are identified by x-ray diffractometer. Micro hardness along the depth of the hardened layer is measured. Conclusions about the influence of the ball burnishing process on strain induced martensitic phase are given.
Highlights
Besides producing a specific surface finish, the ball burnishing process has additional advantages in comparison to other finishing processes, such as providing increased hardness, corrosion resistance and fatigue life, caused by compressive residual stress in the surface layer
By appropriate adjustment of the regime parameters of ball burnishing process, it is possible to obtain compressive residual stresses in the surface region that could lead to considerable improvement in the component life
The main objective of the current research is to investigate the correlation between phase composition of the hardened layer, obtained by a ball burnishing process under a new kinematic scheme and fatigue life of stainless steel grade 304L
Summary
Besides producing a specific surface finish (roughness with regular microshape), the ball burnishing process has additional advantages in comparison to other finishing processes, such as providing increased hardness, corrosion resistance and fatigue life, caused by compressive residual stress in the surface layer. By appropriate adjustment of the regime parameters of ball burnishing process, it is possible to obtain compressive residual stresses in the surface region that could lead to considerable improvement in the component life. In the process of ball burnishing, implemented under a new kinematical scheme, the ball tool performs motion, following a complex trajectory. In this case, the tool path is obtained by means of a linear (or circular) interpolation, using the pre-calculated in a suitable CAD
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