14th International Conference on Shot Peening

Hybrid peening based surface treatments to enhance the fatigue performance of AM materials

E. Maleki, M. Bandini, M. Guagliano, S. Bagherifard

Department of Mechanical Engineering, Politecnico di Milano, Milano, Italy

erfan.maleki@polimi.it; sara.bagherifard@polimi.it; simone.sgarbazzini@mail.polimi.it; mario.gaugaliano@polimi.it

Peen Service Srl, Bologna, Italy

m.bandini@peenservice.it

Introduction

Surface roughness is known as a limiting factor for the performance of additive manufactured materials. The surface of as-built parts are often characterized by high density of randomly positioned or agglomerated partially melted powder particles. The layer by layer nature of these processes as well as support removal also increase the extent of surface irregularity [1]. Besides wear, scratch and corrosion resistance, fatigue life and endurance are also highly affected by surface quality. Thus, to address this issue and improve the surface quality of AM materials, post-processing surface treatments can be considerably useful. However, their parameters should be customized based on the material properties and shape of the part to be treated.

Objectives

This study evaluates the effect of various impact based surface treatments and their combination with thermal and chemical post-treatments on fatigue performance of AlSi10Mg specimens prepared using laser powder bed fusion (LPBF).