Thermomechanical fatigue evaluation and life prediction of 316L(N) stainless steel |
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| Authors: | A. Nagesha M. Valsan R. Kannan K. Bhanu Sankara Rao V. Bauer H.-J. Christ Vakil Singh |
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| Affiliation: | 1. Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India;2. Wieland-Werke Ag, 89079 Ulm, Germany;3. Institut für Werkstofftechnik, Universität Siegen, D-57068 Siegen, Germany;4. Centre of Advanced Study, Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India;1. Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, PR China;2. School of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu 611731, PR China;3. AVIC Commercial Aircraft Engine Co. LTD, Shanghai Engineering Research Center for Commercial Aircraft Engine, Shanghai 201108, PR China;1. European Commission, DG-JRC, Institute for Energy and Transport, via Fermi 2749, 21027 Ispra, Italy;2. European Commission, DG-JRC, Institute for Energy and Transport, 1755 ZG Petten, The Netherlands;3. Institut Laue-Langevin, 38000 Grenoble, France;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. Suzhou Nuclear Power Research Institute, Suzhou 215004, China;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. Collaborative Innovation Center of Universal Iron & Steel Technology, Beijing 100083, China;1. AML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;2. Department of Structural Strength, IHI Corporation, Yokohama 235-8501, Japan |
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| Abstract: | An attempt has been made to understand the thermomechanical fatigue (TMF) behaviour of a nitrogen-alloyed type 316L austenitic stainless steel under different temperature domains. Smooth, hollow specimens were subjected to in-phase (IP) and out-of-phase (OP) thermal–mechanical cycling in air under a mechanical strain control mode, at a strain rate of 6.4 × 10?5 s?1 and a strain amplitude of ±0.4%. For the sake of comparison, total strain controlled low cycle fatigue (LCF) tests were also performed at the peak temperatures of TMF cycling on similar specimens employing the same strain rate and strain amplitude. Life was found to depend on the thermal/mechanical phasing and temperature. Creep was found to contribute to life reduction in IP tests when the peak temperature of cycling was above 600 °C. A few TMF tests were performed in vacuum in order to assess environmental influence on life. Thermomechanical fatigue cycling led to the development of significant amounts of mean stresses and the stress response was generally higher compared to that of LCF tests at the peak cyclic temperatures. Also, the isothermal tests at the peak temperature of TMF cycling resulted in lower lives compared to those obtained under TMF. An attempt was made to predict the TMF life using the isothermal database and satisfactory predictions were achieved using the Ostergren’s frequency modified damage function (FMDF) approach. |
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