Effect of Shot Peening Pressure Variation on Surface Characteristic of SS-316L Dynamic Compression Plate (DCP)

Abstract:

Dynamic Compression Plate (DCP) is a plate made of biomaterials like stainless steel 316L (SS-316L) or titanium, which is used for joining fractured/broken bones for fast recovery. Due to its excellent properties on corrosion, toughness, and hardness; SS-316L is widely used for medical application. Despite its excellent properties, the surface of SS-316L commonly degraded after machining. Therefore, the surface of SS-316L needs to be treated before further use. Shot peening is one of the methods to increase the surface hardness and roughness of material. This research aims to investigate the effect of shot peening to the surface of DCP made of SS-316L from its microstructures, surface roughness, and hardness. In this research, the DCP is designed for joining arms, which are upper-arm (humerus) and forearm (radius and ulna). First we machined the DCP to have holes and bend the plate to match the user bone structure. The DCP is 105 mm × 12 mm × 4 mm in dimension and has 6 holes, 5 mm diameter each, with holes aligned to the plate. After machining, the surface is modified by shot peening using following properties: steel ball (0.4 mm in diameter and hardness 250 HV), 100 mm nozzle-to-plate distance, and shot for 10 minutes. Our parameters are variations in pressure, ranging from 4 to 6 bar. The microstructure of the treated surface was analyzed after shot peening. The result shows that the shot peening treatment of SS-316L has increases its surface hardness and roughness with significant change on its microstructure, which makes a better surface characteristics for DCP.

• Periodical: Applied Mechanics and Materials (Volume 842)
• Pages: 418-422
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.842.418
• Online since: June 2016
• Authors: Yoga Rendra Saputra*, Panji Prihandoko, Sunardi Sunardi, Tutik Sriani, Gunawan Setia Prihandana
• Keywords: Dynamic Compression Plate, Hardness, Microstructure, Shot-Peening, SS-316L

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