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Effect of Surface Severe Plastic Deformation on Microstructure and Mechanical Properties of Low-Carbon Steel Sheet

Falaki, Mohammad Reza | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58654 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kazeminezhad, Mohsen
  7. Abstract:
  8. In recent years, extensive research has been conducted on the severe plastic deformation of steel sheets. One of the effective techniques in this field is the constrained groove pressing (CGP) process, which has attracted considerable attention due to its ability to refine the microstructure and enhance mechanical properties. Moreover, surface severe plastic deformation is of particular importance because it produces a nanocrystalline layer on the material surface and creates a property gradient along the sheet thickness. Severe shot peening is recognized as one of the most effective methods for introducing severe surface deformation. A major challenge in higher passes of the CGP process is the formation of microcracks on the sheet surface, which can lead to deterioration of mechanical properties. In this study, for the first time, the effect of severe shot peening on CGP-processed sheets was investigated to evaluate its role in preventing microcrack growth. For this purpose, severe shot peening was applied to low-carbon steel sheets in two conditions: without prior deformation and after undergoing CGP. The influence of these processes on the microstructure, mechanical properties, and hardness distribution along the sheet thickness was then analyzed. The results demonstrated that severe shot peening effectively inhibits the propagation of surface microcracks. Compared to previous studies, the greatest improvement in mechanical properties was achieved. Furthermore, the specimen subjected only to shot peening with an intensity of A19/5 and 1500% surface coverage exhibited an optimal balance between strength and ductility, whereas the combination of CGP and severe shot peening—specifically, the sample processed with two CGP passes, followed by A19/5 intensity and 1500% coverage—resulted in the highest strength obtained for this material
  9. Keywords:
  10. Severe Shot-peening ; Low Carbon Steel Sheet ; Microstructure ; Mechanical Properties ; Severe Plastic Deformation ; Surface Severe Deformation ; Low Carbon Steel Sheet

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