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Wear Behavior of the Nanostructured A356 Aluminum Alloy Induced by Severe Shot Peening

Esmaeili, Mohammadamin | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46273 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farrahi, Gholamhossein
  7. Abstract:
  8. Wear is the most important cause of surface damage occurs by direct contact of surfaces. Increasing the quality and strength of surface against different kinds of destructive phenomena is significant in manufacturing of mechanical parts. Surface nanocrystallisation can improve the surface protection against wear and can be done by lazer beam and shot peening. In this investigation by sever shot peening process the surface of A356 Aluminium alloy transforms to nanocrystal structure. The dry sliding wear and friction behaviors of A356 Aluminum were evaluated using a pin-on-disk apparatus at ambient conditions. The stationary diameter of 5mm stainless steel pin produced a wear track (scar) on the rotating disk shape specimen. The wear evaluation was carried out at different loading conditions (5, 10, 20N) and various sliding speeds (50, 100, 200 mm/s) on three kinds of specimens: without any hardening operation, conventional shot peening and sever shot peening. Friction coefficients as well as wear volumes are reported. According to test results, wear resistance of sever shot peened specimens is more than others while conventional shot peened specimens have less wear resistance than ordinary specimens. Measurement of friction coefficient showed that shot peened specimens have higher coefficient of friction and also the normal force increasing causes enhancement in coefficient of friction.Wear tracks were characterized with a scanning electron microscope. Specimen’s surface morphology illustrated that the predominant mechanism of wear is abrasive
  9. Keywords:
  10. Shot Peening ; Wear Properties ; Friction Coefficient ; Sliding Wear ; Nanocrystallization ; Aluminum Alloy A356

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