Residual stresses evaluation in precision milling of hardened steel based on the deflection-electrochemical etching technique |
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| Affiliation: | 1. Regional Technological Institute, University of West Bohemia, Pilsen 306 14, Czech Republic;2. Faculty of Mechanical Engineering CTU Prague, Prague 166 07, Czech Republic;1. Department of Industrial Engineering and Systems Management, Feng Chia University, 100, Wenhwa Rd., Seatwen, Taichung City 407, Taiwan;2. Mechanical and Industrial Engineering Department, Louisiana State University, Baton Rouge, LA 70803, USA;3. Department of Industrial Engineering, Hanyang Universty, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea;4. Department of Electronics and Computer Science, Koszalin University of Technology, ul. Śniadeckich 2, 75-453 Koszalin, Poland;1. School of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland;2. Department of Manufacturing Engineering, Industrial Engineering School, National University of Distance Education (UNED), C/ Juan del Rosal n° 12, E28040 Madrid, Spain;1. Department of Materials Science and Engineering, Faculty of Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi 316-8511, Japan;2. Frontier Research Center for Applied Atomic Sciences, Ibaraki University, Shirakata 162-4, Tokai 319-1106, Japan |
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| Abstract: | Machining operations generate residual stresses in both the surface and subsurface of the workpieces. These residual stresses have a big influence on the functionality of the machined parts, thus their evaluation is of great importance. In terms of the fatigue strength and stress-corrosion cracking resistance, the compressive residual stresses are preferred to the tensile ones. In the present study, the generation of residual stresses in the precision milling of steels is evaluated by using the deflection-electrochemical etching technique. Two different materials were used to compare the obtained results: DIN X210Cr12 and DIN 17210-86. For the first one, two different states were tested: hardened and unhardened. The results showed different trends for the materials tested. Thus, the higher residual stresses were found at the surface for the DIN X210Cr12 while the maximum values were obtained in the subsurface for the DIN 17210-86. Finally, when comparing to the X-ray diffraction method, it is stated that both the deflection-electrochemical etching and X-Ray diffraction methods can be used to evaluate the state of the surfaces, though the destructive one can give more detailed information about the residual stresses distribution. |
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| Keywords: | Residual stress Precision milling Electrochemical etching X-Ray-diffraction Electrolyte |
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