Mechanical Strengthening in S235JR Steel Sheets through Vibration-Assisted Ball Burnishing

Abstract

The superficial effect of hardening caused after vibration-assisted ball burnishing and its consequences in the tensile behavior of a carbon steel material are studied in this paper. As ball burnishing affects the material to hundredths of micrometers in depth through plastic deformation, the overall macro effect of this modification was studied. Different levels of preload and vibration amplitude were studied to address the described issue. The study was done in two phases. First of all, the depth to which ball burnishing affects the material was studied by performing Vickers indentation tests with different loads. It was proven that the effects of ball burnishing are best represented when a 0.05 kg load is used, as higher loads include more volume of core material in the measurement, hence hiding the effect of ball burnishing. In a second phase, the ball burnished specimens were subjected to tensile tests. It was proven that an increase of burnishing preload diminishes the ductile behavior of the material and increases its strength representative values, although the proportion of affected material in the cross-section of the specimen is reduced with regard to the whole surface. Additionally, as the preload increases, the effects of assistance through vibrations is reduced, and the effect of the static preload acquires more relevance in modifying the macroscopic mechanical properties of the steel alloy. Experiments using different amplitudes and new forces are encouraged to obtain more information about how the material can be modified optimally through vibration-assisted ball burnishing.

Effect of Ultrasonic Burnishing Parameters on Burnished-Surface Quality of Stainless Steel After Heat Treatment

“…The process does not remove any material. The method causes the plastic deformations on the part surface which creates residual stresses in the worked surface and improve surface quality [7]. Priyadarsini et al, recently showed an overview of past research on surface integrity in burnishing processes; ball burnishing, roller burnishing and low plasticity burnishing (LPB) [8].…”

Effect of the ball burnishing on the surface quality and mechanical properties of a TRIP steel sheet

“…Also, in sheet metal forming operations where the material is deformed by the action of rigid tools, the friction between the sheet and tools, affecting the strain distribution of the sheet, takes a special role on the fracture of the material [4][5][6][7][8][9]. Therefore, several authors have focused on the usage of surface plastic deformation techniques, such as the burnishing process, to improve material characteristics like roughness, hardness, fatigue life, microstructure, corrosion resistance and the mechanical properties of materials [10][11][12][13][14]. In recent years, burnishing is considered as one of the outstanding cold-forming finishing processes employed as a surface treatment technique for the manufacturing industry [15].…”

The Modelling of Surface Roughness after the Ball Burnishing Process with a High-Stiffness Tool by Using Regression Analysis, Artificial Neural Networks, and Support Vector Regression

“…Burnishing force is most often generated with the spring [6][7][8][9][10][11][12][13][14][15], pressurized fluid [16,17], and high stiffness tools [18][19][20]. There are also hybrid ball burnishing tools, such as vibrationassisted ball burnishing tools [21][22][23][24][25][26][27][28][29][30][31][32], magnetic-assisted ball burnishing tools [33,34], etc. Burnishing force is usually generated by a single ball, although ball burnishing tools with multiple balls also exist.…”