14th International Conference on Shot Peening

High cycle fatigue behavior of 316L stainless steel treated by ultrasonic SMAT

Clément Dureaua, Mandana Arzaghia, Yves Nadota, Roxane Massionb, Thierry Grosdidier

Institut Pprime (CNRS UPR 3346), ISAE-ENSMA, Université de Poitiers, Department of Physics and Mechanics of Materials, Futuroscope-Chasseneuil, France, mandana.arzaghi@ensma.fr, yves.nadot@ensma.fr

Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (CNRS UMR 7239), Université de Lorraine, Metz, France, clement.dureau@univ-lorraine.fr, roxane.massion@univ-lorraine.fr, thierry.grosdidier@univ-lorraine.fr

LABoratoire d’EXcellence Design des Alliages Métalliques pour Allègement de Structures, Université de Lorraine, Metz, France

Introduction

In the high cycle fatigue regime, cracks initiate most of the time at the surface of workpieces. Therefore, in addition to the overall mechanical properties, surface and sub-surface characteristics such as roughness and residual stresses affect the fatigue life [1].

Objectives

In the present work, the fatigue crack initiation and growth behaviour in the complex gradient induced by Ultrasonic SMAT (U-SMAT) on 316L austenitic stainless steels were studied. Such mechanical surface treatment is often used to improve the fatigue resistance of various components in industry.