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Low cycle fatigue and strengthening mechanism of cold extruded large diameter internal thread of Q460 steel

  • Advanced Manufacturing Technology
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Abstract

large diameter internal thread of high-strength steel(LDITHSS) manufactured by traditional methods always has the problems of low accuracy and short life. Compared with traditional methods, the cold extrusion process is an effective means to realize higher accuracy and longer life. The low-cycle fatigue properties of LDITHSS are obtained by experiments, and the initiation and propagation of fatigue cracks are observed by scanning electron microscope(SEM). Based on the mechanical properties, surface microstructure and residual stress, the strengthening mechanism of cold extruded large diameter internal thread(LDIT) is discussed. The results show that new grains or sub-grains can be formed on the surface of LDIT due to grain segmentation and grain refinement during cold extrusion. The fibrous structures appear as elongated and streamlined along the normal direction of the tooth surface which leads to residual compressive stress on the extruded surface. The maximum tension stress of LDIT after cold extrusion is found to be 192.55 kN. Under low stress cycling, the yield stress on thread increases, the propagation rate of crack reduces, the fatigue life is thus improved significantly with decreasing surface grain diameter and the average fatigue life increases to 45.539×103 cycle when the maximum applied load decreases to 120 kN. The low cycle fatigue and strengthening mechanism of cold extruded LDIT revealed by this research has significant importance to promote application of internal thread by cold extrusion processing.

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Author information

Authors and Affiliations

  1. College of Mechanical Engineering, Yangzhou University, Yangzhou, 225127, China

    Hong Miao, Qing Mei, Jingyun Yuan, Zaixiang Zheng & Yifu Jin

  2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Dunwen Zuo

Authors
  1. Hong Miao
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  2. Qing Mei
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  3. Jingyun Yuan
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  4. Zaixiang Zheng
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  5. Yifu Jin
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  6. Dunwen Zuo
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Corresponding author

Correspondence to Hong Miao.

Additional information

Supported by National Natural Science Foundation of China(Grant No. 51372216), Jiangsu Science and Technology Plan Project of China (Grant No. BE2015113), Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. BKJB460016)

MIAO Hong, born in 1981, is currently an associate professor at School of Mechanical Engineering, Yangzhou University, China. He received his PhD degree from Nanjing University of Aeronautics and Astronautics, China, in 2011. His research interests include surface motor structure design, surface motor motion control, etc.

MEI Qing, born in 1991, is currently a master at School of Mechanical Engineering, Yangzhou University, China. His research interests include agricultural machinery engineering, etc.

YUAN Jingyun, born in 1991, is currently a master at School of Mechanical Engineering, Yangzhou University, China. Her research interests include automotive engineering, etc.

ZHENG Zaixiang, born in 1972, is currently an associate professor at School of Mechanical Engineering, Yangzhou University, China. He received his PhD degree from Nanjing University of Science and Technology, China, in 2007. His research interests include mechatronic integration, etc.

JIN Yifu, born in 1972, is currently an engineer at School of Mechanical Engineering, Yangzhou University, China. He received his master degree from University of Mining and Technology, China, in 2003. His research interests include mechanical engineering, etc.

ZUO Dunwen, born in 1962, is currently a professor at School of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, China. He received his PhD degree from Kumamoto University, Japan, in 1990. His research interests include mechatronic integration, etc.

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Miao, H., Mei, Q., Yuan, J. et al. Low cycle fatigue and strengthening mechanism of cold extruded large diameter internal thread of Q460 steel. Chin. J. Mech. Eng. 29, 556–563 (2016). https://doi.org/10.3901/CJME.2016.0318.033

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  • DOI: https://doi.org/10.3901/CJME.2016.0318.033

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