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

Abstract

Ball burnishing is a finishing technique involving plastic deformation on the workpiece surface. In this paper, the influence of the ball burnishing operation on the average roughness, tensile properties, anisotropy and work hardening of a TRIP steel was analyzed. An experimental study of the effect of the ball burnishing process on uniaxial tensile specimens was conducted using the Response Surface Methodology (RSM) based on a 3 2 Factorial Design (FD). The effects of burnishing force (B F ) and the number of tool passes (N P ) on the average roughness (R a ), the yield stress (σ Y ) and the percentage of elongation to fracture (% El) were evaluated. The quadratic regression models were obtained to predict R a and σ Y with determination coefficients (R 2 ) of 0.85 and 0.99, respectively. The results indicated that the ball burnishing process produces a maximum reduction of R a of 81.7% (from 1.250 to 0.229 μm). Also, it was observed that the ductility of the material increased in a 25% and the yield stress and work hardening can be substantially modified. Finally, it was found that by using the ball burnishing process, the planar anisotropy of the sheet can be reduced.

Experimental validation of ball burnishing numerical simulation on ball-end milled martensitic stainless-steel considering friction and the initial surface topography

“…In fact, granted anisotropy is not independent of the initial tensor (on the contrary to the ball-burnishing on textured ferritic surface simulation [3]). Substantial improvements in the compression residual state have been obtained in the parallel direction to the burnishing route, although the anisotropic trend remains in the perpendicular direction (as was quoted by [3,10,17,21]). These results demonstrate the flexibility of the model.…”

“…Under 270 N load, the maximum value is reached within the 50 mm and a noticeable anisotropic residual stress tensor distribution is imposed. According with Capilla-Gonz alez et al [17], as the load increases, the isotropy tendency increases. Simulation validates this statement while allows to exhibit the residual stress tensor distribution depending on the tribo-contact between the ball and the textured surface (because of the shift on the applied load).…”

“…In this manner, wear and fatigue resistance are increased owing to the strain hardening [1,3,8,10e12] and thereby, a new surface [3,8,13e15] and sub-surface stress state [1,3,7,11,16]. Studies quote a subtle influence by the speed [1,4,10], feed [1,10] and number of passes [1,17] on this final residual condition.…”

“…Conversely, low friction extends the deformation to depth. In consequence, the main external parameters of the process such as applied load, lateral pass, ball material and ball diameter [1,2,4,7,9,10,16,20] must be configured in accordance with the metallic material of the machined component [1], considering the interactional effects, such as the friction coefficient [3,26,27] and the anisotropy imparted [3,10,17,21,30] (that is reduced as the load increases [17]), according to the functionality of the final component.…”

Influence of Some Microchanges Generated by Different Processing Methods on Selected Tribological Characteristics

“…The above information, and the information included in other works [20][21][22][23][24][25], refer to changes in some operating properties when a surface layer with a thickness of, at most, several hundred micrometers is affected by the processing methods by which the analyzed surfaces were made.…”