Volume 21 Issue 4
Sep.  2021
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2021  >  21(4): 163-171
YANG Bin, FENG Bo, LI Yi-fan, LIAO Zhen, ZHANG Ji-wang, XIAO Shou-ne, YANG Guang-wu, ZHU Tao. Influence of surface micro shot peening on short fatigue crack behavior of CuNi2Si alloy[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 163-171. doi: 10.19818/j.cnki.1671-1637.2021.04.012
Citation: YANG Bin, FENG Bo, LI Yi-fan, LIAO Zhen, ZHANG Ji-wang, XIAO Shou-ne, YANG Guang-wu, ZHU Tao. Influence of surface micro shot peening on short fatigue crack behavior of CuNi2Si alloy[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 163-171. doi: 10.19818/j.cnki.1671-1637.2021.04.012
shu

Influence of surface micro shot peening on short fatigue crack behavior of CuNi2Si alloy

doi: 10.19818/j.cnki.1671-1637.2021.04.012

  • State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

Funds:

National Natural Science Foundation of China 51675446

National Natural Science Foundation of China U1534209

More Information
  • Author Bio:

    YANG Bing(1979-), male, professor, PhD, yb@swjtu.edu.cn

  • Received Date: 2021-03-10
    Available Online: 2021-09-16
  • Publish Date: 2021-08-01
    Abstract
  • Under tension-compression loading, the fatigue short crack replica tests of funnel-shaped round bar specimens of CuNi2Si alloy with/without micro-shot peening were carried out, respectively. Tests were interrupted at a series of predetermined load cycles to replicate the surface of the specimen with acetate film, and then the data related to short crack initiation and propagation were obtained by using the reverse order observation method. Analysis results show that the fatigue cracks of both types of specimens initiate on the surface. The crack shows a zigzag growth under the influence of microstructure. In general, it shows a trend of slow growth in the early stage followed by a rapid growth in the later stage until the fracture of the specimen, with a critical instability crack propagation size of about 750.0 μm. With the introduction of micro shot peening technology, the crack growth process changes from the intergranular mode to the transgranular mode. The fracture morphologies of specimens with/without micro shot peening are very different. Compared to un-peening specimens, micro shot peening specimens show a larger crystal plane in the crack initiation position without obvious grain characteristics. They show smaller crack source area, larger number of fatigue stripes produced in the fatigue process, and more obvious dimple morphology in the instantaneous fracture area. After micro shot peening, the average fatigue life of the specimens increases approximately 31.5 times, and the fatigue life proportion occupied by the stage of crack initiation and slow growth increases from 60% to 80%, indicating that the significant increase in fatigue life is mainly reflected in the initiation and stable propagation stage of short cracks. The strengthening effect is mainly affected by the surface effective stress, hardness, and the number of grain boundaries, but it has little effect on the later stage of fatigue crack growth. 3 tabs, 11 figs, 30 refs.

     

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