Influence of multi-point laser shock peening process on surficial mechanical properties in gear steels
For the gears of aero-engine accessory system，the complex working environment requires high fatigue resistance and wear resistance on the gear surface. Laser shock peening technology introduces residual compressive stress and high micro-hardness by severe plastic deformation on the material surface....
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Aeronautical Materials
2025-02-01
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| Series: | Journal of Aeronautical Materials |
| Subjects: | |
| Online Access: | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2023.000212 |
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| Summary: | For the gears of aero-engine accessory system，the complex working environment requires high fatigue resistance and wear resistance on the gear surface. Laser shock peening technology introduces residual compressive stress and high micro-hardness by severe plastic deformation on the material surface. A more uniform residual stress field and hardness distribution are crucial to improve the fatigue life and wear resistance of the parts. Thus，it is an important topic to investigate how to obtain a uniform residual stress field and hardness distribution by optimizing the technical parameters of laser shock peening. In this paper，a four-layer overlapping laser shock peening path scheme is proposed，and the spatial distribution characteristics of residual stress and micro-hardness after laser shock peening are analyzed by the finite element numerical simulation and experiment. Using finite element numerical simulation method，the spatial homogeneous distribution of the residual stress field after the multi-point laser shock peening is studied. The effects of laser energy and impact times on the residual stress and micro-hardness of gear steel are experimentally investigated. The results show that the proposed four-layer overlapping laser shock peening path scheme can obtain a more uniform surface residual compressive stress field. With the increase of laser energy and impact times，the surface residual stress and micro-hardness also increase，but the increase magnitude will decrease，showing a certain saturation trend. |
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| ISSN: | 1005-5053 |