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

1
Institute of Production Engineering, Saarland University, D-66121 Saarbrücken, Germany
2
Department of Materials Science and Materials Testing, University of Applied Sciences, D-67657 Kaiserslautern, Germany
*
Author to whom correspondence should be addressed.
J. Manuf. Mater. Process. 2019, 3(3), 56; https://doi.org/10.3390/jmmp3030056
Received: 24 May 2019 / Revised: 30 June 2019 / Accepted: 5 July 2019 / Published: 10 July 2019
(This article belongs to the Special Issue Surface Integrity in Machining)
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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. View Full-Text
Keywords: residual stresses; X-ray diffraction; deep rolling; mechanical surface treatment; surface integrity; process chain; AISI 4140 steel residual stresses; X-ray diffraction; deep rolling; mechanical surface treatment; surface integrity; process chain; AISI 4140 steel
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Lyubenova, N.; Bähre, D.; Krupp, L.; Fouquet, J.; Cronier, T.; Patel, J.; Hoffmann, J.E. Impact of the Process Parameters, the Measurement Conditions and the Pre-Machining on the Residual Stress State of Deep Rolled Specimens. J. Manuf. Mater. Process. 2019, 3, 56.

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