14th International Conference on Shot Peening

Fine, Hard, and High Density Ceramic Beads for Shot Peening

David Bouttes, Liying Zhou, Frederic Wiss, Anne-Laure Beaudonnet

Saint-Gobain Research Provence, 550 av. A. Jauffret, 8300 Cavaillon, France – david.bouttes@saint-gobain.com

Saint-Gobain Research Shanghai, 55 Wen Jing Road, Minhang Development Zone, 200245 Shanghai, China – liying.zhou@saint-gobain.com

Introduction

The choice of the shot peening media is of key importance in order to optimize the process: indeed, depending on the size and hardness, it will determine the accessible stress profile and surface roughness [1]. If metallic shots of different grades are standard, ceramic shots can be of interest regarding the control of contamination, and when hard media are needed. A few years ago, high density (6 g/cc) and high hardness (~1200HV) media were introduced [2], which allowed to impart intense residual stress on hard substrates with relatively low media impact velocity. In the following, we explore the use of such high density media, and more specifically fine sizes: from 50μm to 300μm, regarding the accessible residual stresses and roughness with such media.

Objectives

We test high density and fine ceramic media, of density 6g/cc and hardness 1250HV, on several metal substrates (titanium, steel). By comparison with standard steel shots (fused cast and cut wire), we evaluate the accessible residual stress and surface roughness.