Effect of strain amplitude on the low-cycle fatigue behavior of a new Fe–15Mn–10Cr–8Ni–4Si seismic damping alloy |
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| Affiliation: | 1. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. Belgorod State University, Pobeda 85, Belgorod 308015, Russia;3. Takenaka Corporation, 1-5-1, Otsuka, Inzai, Chiba 270-1395, Japan;4. Awaji Materia Co., Ltd., 2-3-13, Kanda-Ogawamachi, Chiyoda, Tokyo 101-0052, Japan;5. Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. Ford Research and Advanced Engineering Laboratory, Dearborn, MI 48124, USA;3. AECC Commercial Aircraft Engine Co., Ltd, Shanghai 200241, China;1. Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;2. Dept. of Metallurgical & Materials Engg., Indian Institute of Technology Madras, Chennai 600036, India;3. Dept. of Metallurgical & Materials Engg., Mahatma Gandhi Institute of Technology, Hyderabad 500075, India;1. R & D Centre for Iron & Steel, Steel Authority of India Limited, Ranchi 834002, Jharkhand, India;2. Metallurgical and Material Engineering Department, Jadavpur University, Kolkata 700032, India;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People''s Republic of China;2. University of Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;1. School of Mechanical Engineering, Sichuan University, Chengdu, 610065, Sichuan, China;2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China;3. The Second Research Institute of Civil Aviation Administration of China, Chengdu, 610041, Sichuan, China |
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| Abstract: | The low-cycle fatigue (LCF) properties and post-fatigue microstructure of a Fe–15Mn–10Cr–8Ni–4Si austenitic alloy were investigated under an axial strain control mode with total strain amplitudes, Δεt/2, ranging from 2.5 × 10?3 to 2 × 10?2. The fatigue resistance of the alloy was described by Coffin–Manson’s and Basquin’s relationships, and the corresponding fatigue parameters were evaluated. In addition, the Masing behavior, which is associated with a constant deformation mode during fatigue, was revealed at the examined strain amplitudes. Microstructural observations of the fatigue fractured samples showed that the strain induced ε-martensitic transformation accompanied by a planar slip of the Shockley partial dislocations in the austenite is the main deformation mode controlling the fatigue behavior of the studied alloy at Δεt/2 < 2 × 10?2. However, at Δεt/2 = 2 × 10?2, the formation of a cell structure was found in the austenite in addition to ε-martensitic transformation. The LCF resistance of the alloy was compared with conventional Cr–Ni austenitic stainless steels, ferrous base TRIP and TWIP steels and low yield point damping steels. It was found that at the studied strain amplitudes the alloy possessed a higher LCF resistance compared to conventional Fe-base alloys and steels. Remarkably, the fatigue ductility coefficient, εf′, of the studied alloy is 1.3–6 times higher than that of the stainless steels because of a cyclic deformation-induced ε-martensitic transformation. The results showed that the ε-martensitic transformation that occurred in the studied alloy during LCF is the main reason for the improved LCF resistance. |
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| Keywords: | High-Mn alloy Low-cycle fatigue Cyclic properties ε-martensite Strain-induced martensitic transformation |
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