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Wear Resistance of Severely Deformed Low Carbon Steel Sheet

Shahi Anhar, Mohammad Reza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56987 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kazeminezhad, Mohsen
  7. Abstract:
  8. Carrying out severe plastic deformation by different ways cause increasing the wear resistance of some alloys and decreasing the wear resistance of some other alloys. So far, many researches have been done on strength and microstructure of low carbon steel sheets after severe plastic deformation by constrained groove pressing method. However, the effect of the mentioned method on the wear resistance of low carbon steel is not investigated. In current research, the effect of severe plastic deformation by constrained groove pressing, annealing (at 300℃,400℃ and 500℃ for 20 minutes then cooling in air) after severe plastic deformation and also rapid annealing (at molten metal with temperature of 600℃ for 10s,20s and 60s then quenching in water) after severe plastic deformation on wear resistance of low carbon steel was investigated. Microstructural observations were performed using optical microscope and image j software. The mechanical properties of the studied sample were evaluated by hardness and tensile test. The wear test of pin on disk carried out with 40N vertical force for 3 hours and the slip velocity of 0.1 m/s at room temperature and without lubricant was done and weight loss of sample measured by four decimal places scale. The wear surfaces of samples, debris and cross section of samples with highest and lowest wear resistance investigated by SEM. The results indicate that CGP cause out reduce of wear resistance. So that wear rate of as-received sample is equal to 8.45 (10-5mm3/N.m) and reach to 8.93 (10-5mm3/N.m) &10 (10-5mm3/N.m) respectively after one and two pass SPD. The annealing after SPD improved the wear resistance compared to the sample without annealing. Also, rapid annealing after SPD for 10 seconds decreased the wear resistance and more than this time improved the wear resistance compared to the sample without rapid annealing. The reason for this was the recrystallization, grain growth, changes in the work hardening exponent, and stability of the oxide layer on the surface of samples. In the same conditions of annealing heat treatment, the samples without SPD had the highest wear resistance and the samples with two passes of SPD had the lowest wear resistance. Also, In the same conditions of rapid annealing heat treatment, the samples without SPD had the highest wear resistance and the samples with one passes of SPD had the lowest wear resistance. The dominant wear mechanism in the samples was a combination of abrasive, adhesive and tribo-oxidative wear. By comparing the test results, it was found that the wear resistance of samples without and with severe plastic deformation have a direct relationship with hardness and strain hardening capability of the samples, respectively
  9. Keywords:
  10. Wear Resistance ; Low Carbon Steel ; Severe Plastic Deformation ; Constrained Groove Pressing (CGP) ; Annealing ; Rapid Annealing

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