What is it about?
Shot peening operation is used to improve the mechanical properties of the materials. In this study new rotary peening machine is fabricated. The Hardness and Compressive stress were investigated with help of Vickers Hardness and UTM respectively.
Featured Image
Why is it important?
Shot peening is the cold working process to produce a compressive residual stress layer and modify mechanical properties of metals. It entails impacting a surface with shot (round metallic, glass, or ceramic particles) and force sufficient to create plastic deformation. Peening, a surface spreads its plastically, causes change in the mechanical properties of the surface. Its main application is to avoid the propagation of micro cracks from a surface. Such cracks do not propagate in a material that are under a compressive stress;
Perspectives
The hardness and compressive residual stress are improved in this process, the increase in hardness is purely related to the speed at which ball strike the sample. The hardness has maximum value (136.80 HV) at the top surface of sample as compared to the core of the material, it is due to the ball strike on top surface of the sample. The compressive stress is improved for peened sample (Fmax 75.16 KN) as compared to the unpeened sample(Fmax 65.18KN) it is also due to the striking of the sample surface by balls. Continuous striking of the sample surface with ball leads to larger grains are elongated into the smaller grains. Which is seen from SEM image (Fig.7), From the ANOVA table it shows that speed is most influencing parameter (81.35%) followed by number of ball (14.06%), the both are obtained by percentage of contributions. The parameters are optimized using Taguchi technique. Based on this operation the best optimized result comes, when the Speed is 200 rpm, Diameter of ball is 10mm, and the number of balls are 100.
balaji ds
AMET University
Read the Original
This page is a summary of: Experimental Investigation and Process Optimization on Shot Peening of Aluminium Alloy (AA6061), Applied Mechanics and Materials, September 2016, Trans Tech Publications,
DOI: 10.4028/www.scientific.net/amm.852.171.
You can read the full text:
Contributors
The following have contributed to this page
