"Experimental and Analytical modelling for Reducing Roughness Through Shot Peening on AM Samples" 

Sivasubramanian Chandramouli, MSE PhD Candidate 

Advisor: Professor Mike Titus

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ABSTRACT

The powder bed fusion process is one of the predominant methods for producing parts for the aerospace and automobile industries. Even though additive manufacturing can produce samples by multiple energy source such as electron or laser beam using the layer-by-layer technique for intricate parts such as turbine blades with micro-level accuracy, one of the major problems with this process is high surface roughness and tensile stresses in as-printed 316SS and Inconel 718 samples which limits their utilization in industries. In this research, we focus on understanding the role of post-processing such as shot peening in solving these constraints. Further, we address the limitations and research gaps in understanding the requirements and variation of the post-processing conditions specifically depending on printing history and parameters. Adding to these we will acknowledge the added advantages of shot peening on other properties such as residual stresses, stress corrosion cracking (SCC), and porosity.