Heat treatment effect on thermo-mechanical fatigue and low cycle fatigue behaviors of A356.0 aluminum alloy |
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| Affiliation: | 1. School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;2. Fatigue Workgroup, Vehicle/Engine Laboratory and Validation Department, Irankhodro Powertrain Company (IPCo.), Tehran, Iran;3. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran;1. CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. PPRIME institute, ISAE-ENSMA, UPR CNRS 3346, Material Engineering Department, 1 Avenue Clément Ader, Téléport 2 – BP 40109, F86961 FUTUROSCOPE CHASSENEUIL Cedex, France;2. Laboratoire de Mécanique de Sousse, Ecole Nationale d’Ingénieurs de Sousse, Bp 264 erriadh, 4023 Sousse, Tunisia;3. School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, B38g Sackville St. Building, Manchester M13 9PL, UK;4. Dept. of Materials Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada;1. Materials Fatigue and Fracture Laboratory, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, PR China;2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, PR China;3. School of Materials Science and Engineering, Shenyang University of Technology, 111 Shenliao Road, Shenyang 110870, PR China;1. Fraunhofer Institute for Mechanics of Materials IWM, Wöhlerstraße 11, 79108 Freiburg, Germany;2. Offenburg University of Applied Sciences, Badstraße 24, 77652 Offenburg, Germany |
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| Abstract: | In the present paper, the heat treatment effect on A356.0, a cast aluminum alloy which has been widely used in diesel engine cylinder heads, is investigated under out-of-phase thermo-mechanical fatigue and low cycle fatigue (at different temperatures) loadings. A typical heat treatment is applied to the material including 8 h solution at 535 °C, water quench and 3 h ageing at 180 °C. The experimental fatigue results show that the heat treatment process has considerable influence on mechanical and low cycle fatigue behaviors, especially at room temperature, but its effect on thermo-mechanical fatigue lifetime is not significant. The improvement in the strength can be explained by the dislocation theory. Under thermo-mechanical fatigue loadings, the difference between the fatigue lifetime of A356.0 alloy and A356.0-T6 alloy decreases when the temperature range increases. In this condition, plastic strain increases severely during the fatigue cycles in A356.0-T6 alloy due to over-ageing phenomenon and therefore, the amount of cyclic softening in heat treated alloy is more. |
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