Very high cycle fatigue properties of bainitic high carbon–chromium steel |
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| Authors: | H Mayer W Haydn R Schuller S Issler B Furtner M Bacher-Höchst |
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| Affiliation: | 1. Institute of Physics and Materials Science, BOKU, Peter-Jordan-Street 82, A-1190 Vienna, Austria;2. Robert Bosch GmbH, Corporate Research and Development, Material and Process Development Metals, P.O. 300240, 70442 Stuttgart, Germany;1. Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;3. Research Center for Hydrogen Industrial Use and Storage (HYDROGENIUS), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;5. Institute of Materials Science and Technology, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan;6. Basic Technology Research Center, NSK Ltd., 1-5-50 Kugenumashinmei, Fujisawa, Kanagawa 251-8501, Japan;7. Department of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan;1. Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Materials Science & Engineering Research Center, Beijing Jiaotong University, Beijing 100044, China;3. Laboratory for Excellence in Advanced Steel Research, Center for Structural and Functional Materials Research and Innovation and Department of Metallurgical and Materials Engineering, University of Texas at El Paso, 500W. University Avenue, El Paso, TX 79968-0520, USA;1. College of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan;2. Machinery Systems Division, Industrial Products Company, Hitachi Ltd., Nakanoshima Festival Tower, 3-18 Nakanoshima 2-chome, Kita-ku, Osaka 530-0005, Japan;3. Faculty of Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan;4. National Institute of Technology, Toyota College, 2-1 Eisei-cho, Toyota, Aichi 471-8525, Japan;5. Graduate School of Engineering, Kobe University, Rokkoudai, Nada-ku, Kobe, Hyogo 657-8501, Japan;6. National Institute of Technology, Akashi College, Uozumi, Akashi, Hyogo 674-8501, Japan |
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| Abstract: | Fatigue properties of bainitic 100Cr6 (SAE 52100, JIS SUJ2) steel are investigated in the high cycle and very high cycle fatigue (VHCF) regime. Fully reversed tension–compression fatigue tests are performed with ultrasonic fatigue testing equipment. Specimens are grinded which leads to surface compression stresses and increased surface roughness. About 1/3 of the specimens failed after crack initiation at interior Al2O3? or TiN-inclusions and 2/3 failed after surface crack initiation at scratches or cavities. When inclusions are considered as cracks, failures can occur at minimum stress intensity range of 2.8 MPa m1/2, and maximum stress intensity range without failure is 3.3 MPa m1/2. Facets are visible close to the inclusion in some specimens, and the stress intensity range at the border of the facet is approximately 4.5 MPa m1/2. Murakami’s model can well predict the endurance limit at 109 cycles for internal failures considering the area of the inclusion in the evaluation. Surface fatigue crack initiation can lead to failure above 108 cycles. When scratches are considered as cracks, minimum stress intensity range of 2.5 MPa m1/2 can propagate surface cracks to failure. Fracture mechanics approach showed several similarities to literature results of the same material tested in tempered martensite condition. |
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