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<p>The 2024-T351 Al alloy has excellent properties, which is widely used in key structural components in aviation. Its surface quality and performance are critical. A study on the strengthening of the shot peening process of the 2024-T351 Al alloy is carried out, using conventional shot peening (CSP), micro-particle shot peening (MSP) and secondary shot peening (SSP) processes. Combined with microstructure evolution, the strengthening mechanism of shot peening is revealed. The equivalent strain and the residual stress are reflected through the finite element simulation software. The surface roughness of the CSP sample is 8.6&#xa0;μm. Compared with the CSP sample, those of the MSP and the SSP samples are reduced to 3.2 and 3.1&#xa0;μm, respectively. The maximum plastic strain of the MSP sample is raised by 2.57. And the Maximum residual stress increase of 280&#xa0;MPa. The distribution of equivalent strain on the surface of the SSP sample is more uniform than that of the CSP sample. And the maximum residual compressive stress increases&#xa0;by 165&#xa0;MPa. The grain size of the CSP sample is 3.88&#xa0;μm. The grain size of the CSP sample &#xa0;increases by 2.27&#xa0;μm, and that of the SSP sample is refined by 0.91&#xa0;μm. All in all, the surface integrity of the alloy is effectively improved by the SSP process.</p>

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Study on the Strengthening Mechanism of Shot Peening Process of 2024-T351 Aluminium Alloy for Aviation

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Peng Zhang,
  • Anqiang Zhu,
  • Jian Ning,
  • Liying Zhang,
  • Zhiyang He,
  • Ziyu Wang,
  • Benqi Jiao

摘要

The 2024-T351 Al alloy has excellent properties, which is widely used in key structural components in aviation. Its surface quality and performance are critical. A study on the strengthening of the shot peening process of the 2024-T351 Al alloy is carried out, using conventional shot peening (CSP), micro-particle shot peening (MSP) and secondary shot peening (SSP) processes. Combined with microstructure evolution, the strengthening mechanism of shot peening is revealed. The equivalent strain and the residual stress are reflected through the finite element simulation software. The surface roughness of the CSP sample is 8.6 μm. Compared with the CSP sample, those of the MSP and the SSP samples are reduced to 3.2 and 3.1 μm, respectively. The maximum plastic strain of the MSP sample is raised by 2.57. And the Maximum residual stress increase of 280 MPa. The distribution of equivalent strain on the surface of the SSP sample is more uniform than that of the CSP sample. And the maximum residual compressive stress increases by 165 MPa. The grain size of the CSP sample is 3.88 μm. The grain size of the CSP sample  increases by 2.27 μm, and that of the SSP sample is refined by 0.91 μm. All in all, the surface integrity of the alloy is effectively improved by the SSP process.