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Volume 40 Issue 5
May  2014
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Journal of Beijing University of Aeronautics and Astronautics  > 2014  >  40(5): 608-612.
Wang Xin, Jiang Zhihua, Zeng Houxiang, et al. Effect of shot-peening on low-cycle fatigue property of 18% Ni ultra-high strength steel[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(5): 608-612. doi: 10.13700/j.bh.1001-5965.2013.0388(in Chinese)
Citation: Wang Xin, Jiang Zhihua, Zeng Houxiang, et al. Effect of shot-peening on low-cycle fatigue property of 18% Ni ultra-high strength steel[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(5): 608-612. doi: 10.13700/j.bh.1001-5965.2013.0388(in Chinese)
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Effect of shot-peening on low-cycle fatigue property of 18% Ni ultra-high strength steel

doi: 10.13700/j.bh.1001-5965.2013.0388

  • 1. Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China, Beijing 100095, China;

  • 2. Guizhou Liyang Aviation Dynamic Co. Ltd, Pingba 561102, China

  • Received Date: 02 Jul 2013
  • Publish Date: 20 May 2014
    Abstract
  • 18% Ni ultra-high strength steel C250 was employed to investigate the effect of single shot peening (SSP) with cast-iron bead and double shot peening (DSP) with cast-iron bead and glass bead on surface topography, micro-structure and low-cycle fatigue (LCF). The results show that the low-cycle fatigue life has risen by nearly 2.5 times due to SSP, however, the low-cycle fatigue life after DSP increases by 3 times. Moreover, the sub-grain refinement after peening is the main factor which extends the LCF life, and the smooth surface caused by DSP promotes the LCF property. Furthermore, by comparison with fatigue fracture of unpeened and SSP sample presenting multi-source crack initiations, the DSP one fractured with only one source due to the smooth surface.

     

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