Impact of the Process Parameters, the Measurement Conditions and the Pre-Machining on the Residual Stress State of Deep Rolled Specimens

Abstract

Mechanical surface treatments, e.g., deep rolling, are widely spread finishing processes due to their ability to enhance the fatigue strength of the treated materials with means of cold working and inducement of favorable compressive residual stresses. Despite of the clear advantages of deep rolling, the controlled generation of compressive residual stresses is still a challenging task, as the process can be influenced by the pre-machining stress state of the treated material. Additionally, the exact characterization of the induced residual stress field is impacted by the specific characteristics of the applied measurement technique. Therefore, this paper is focused on the X-ray diffraction residual stress analysis of deep rolled specimens, pre-machined to achieve rough or polished surface. The deep rolling process was realized as a single-trace to avoid the influence of the other process parameters and the resulted residual stress field on the surface and in depth was investigated. Additionally, the surface residual stress profiles were determined using two different measuring devices to analyze the impact of the different measurement conditions.

Deep Rolling Techniques: A Comprehensive Review of Process Parameters and Impacts on the Material Properties of Commercial Steels

“…N. Lyubenova et al [47] analyzed the impact of process parameters (rolling pressures, number of passes and overlap percentage, pre-machining state, and measurement techniques) on the CRS state in deep-rolled AISI 4040 steel material. Their findings derived ambiguous conclusions indicating a high degree of interaction among the considered process parameters.…”

An Investigation of the Influence of a Micro-Textured Ball End Cutter’s Different Parameters on the Surface Residual Stress of a Titanium Alloy Workpiece

“…Lyubenova [3,4] studied the residual stress of single-track, deep-rolling specimens, and tested the distribution of surface residual stress with two different measuring devices to analyze the influence of different measuring conditions on the distribution of residual stress, and obtained the measurement conditions of residual stress. Niu et al [5,6] combined the longitudinal, torsional ultrasonic vibration and milling processes to carry out the experimental research on titanium alloy Ti-6Al-4V.…”