Experimental Assessment of the Depth of the Deformed Layer in the Roller Burnishing Process

Abstract

This paper presents the methods of experimental determining the depth of the plastically deformed top layer in the roller burnishing process. Precise determination of the depth of the plastically deformed layer is difficult due to slight deformation at the boundary of the plastic and elastic zone, the lack of visible changes in the microstructure, and minimal changes in microhardness. The article shows the method of original measurement method that consists in determining the thickness of the deformed layer using rings. The method involves the profilographometric measurements of the disconnected rings (samples) which are flat-faced in the package on the mandrel. The rings material deforms plastically in the surface layer causing wrapping of the end face of the ring in the direction of the rolling tool movement. After dismantling the ring pack, measurements were made on the face of each ring along radial directions, and the thickness of the deformed layer was observed on the microscope. The method was verified by microhardness measurements in the cross-section and cross-section of the ring. The results of deformation depth measurements were verified by finite-element-based numerical simulation.

Study on the Surface Layer Properties and Fatigue Life of a Workpiece Machined by Centrifugal Shot Peening and Burnishing

“…As with shot peening, burnishing leads to formation of compressive residual stresses in the surface layer of workpieces and increases the microhardness of this layer [ 31 , 32 ]. In another study [ 33 ], it was noticed that, after roller burnishing C45 steel, the plastically deformed surface layer can be divided into two characteristic zones. A surface layer is characterized by a large deformation of the grains of the metallographic structure and a large increase in hardness.…”

Effect of Surface Mechanical Treatment on Mechanical Properties and Impact Behavior of S355JR Steel

“…-M. Kowalik and al., [30] shows that after burnishing under a pressure of the 3 kN roller on the C45 steel, the thickness of the plastically deformed superficial layer observed under the microscope and verified by microhardness measurements has reaches 0.7 mm in a deformed area of 1.2 mm.…”

Experimental and Numerical Analysis of the Depth of the Strengthened Layer on Shafts Resulting from Roller Burnishing with Roller Braking Moment

“…Kowalik et al [ 28 , 29 ] developed an original method for determining the depth of deformation of the plastically deformed layer during roller burnishing, based on the observation of the front surfaces of ring specimens. The method thus developed involves increasing the depth δ of plastic deformation in the surface layer by applying a braking moment on the burnishing roller, while maintaining the rolling nature of the burnishing process.…”

“…The depth of deformation was obtained as a function of the process parameters: material strength, burnishing force and roller radius. Analysis of the RB process, in which a braking moment was applied to the roller, was first analysed by the authors in papers [ 28 , 29 ]. However, the results only applied to the RB process with braking moment.…”