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.
Highlights
Deep rolling is a well-known surface finishing process established in the 1930s of the last century [1,2,3]
As a continuation of the research in [14], the present paper focuses on the impact of the deep rolling (DR) process parameters, the measurement conditions and the pre-machining on the residual stress (RS) state of DR specimens
Longitudinal and transverse directions refer the direction of the later DR trace and not the cutting direction of the milling process
Summary
Deep rolling is a well-known surface finishing process established in the 1930s of the last century [1,2,3]. It has a very wide application range, due to its simple principle [4] and the resulting high set-up flexibility. Despite of the clear benefits of deep rolling (DR), the controlled generation of compressive RS is still a challenging task, due to several factors like the numerous of available process parameters and the stress state influenced by the pre-machining of the treated material. The exact prediction of the RS state after deep rolling has still not been achieved, despite the available common knowledge about the impact of the mostly important process parameters, gathered by extensive research studies throughout the past decades [8,9]
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