Microscopic phase-dependent residual stresses in the machined surface layer of two-phase alloy |
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| Authors: | T Obikawa Y Takemura Y Akiyama J Shinozuka H Sasahara |
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| Affiliation: | 1. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan;2. Department of Mechanical and Control Engineering, Tokyo Institute of Technology, Japan;3. Department of Mechanical Engineering, Ibaraki University, Japan;4. Department of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Japan;1. School of Material Science and Engineering, Chongqing University, Chongqing 400044, China;2. China National Erzhong Group Co, Deyang 618000, China;1. Center of Research in Engineering and Applied Science, FCQeI UAEM., Av Univ. 1001 Col., Chamilpa 62209, Cuernavaca Mor., Mexico;2. Institute of Physical Sciences, Autonomous National University of Mexico, P.O. Box 48-3, Av Univ. s/n Col. Chamilpa 62210, Cuernavaca Mor., Mexico;1. Department of Mechanics and Machine Design, Opole University of Technology, ul. Miko?ajczyka 5, 45-271 Opole, Poland;2. Department of Materials Science and Chipless Production Engineering, Opole University of Technology, ul. Miko?ajczyka 5, 45-271 Opole, Poland;1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Faculty of Automotive and Construction Machinery Engineering – Warsaw University of Technology, Warsaw, Poland;2. State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, China |
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| Abstract: | Residual stresses in the machined surface layer, which affect fatigue crack nucleation and stress corrosion cracking especially in aerospace engines and gas turbines for power generation, depend on microstructures in case of machining a multiple-phase alloy. Hence, the microscopic phase-dependent residual stresses should be known when a machined part is used under critical stress conditions and circumstances. In the present paper, finite element modeling of machining two-phase alloys has been developed for obtaining the residual stresses in the machined surface layer. Iron and steels, which consist of different volume fractions of ferrite and eutectoid pearlite, were selected as work materials to be machined. First, it was confirmed that the calculated results agree well in chip formation and cutting forces with experimental ones. Then, residual stresses in the machined surface layer were obtained for different carbon contents and regular/random arrangements of microstructure. As a result, it is found that the microstructure of the workpiece has a great influence on the residual stress distribution on the machined surface and that tensile surface residual stress on pearlite is much larger than that on ferrite. Finite element machining of the work material with stripe arrangement of ferrite and pearlite revealed that the peak of residual stress would be reduced by decreasing the width of stripes of ferrite and pearlite. |
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