14th International Conference on Shot Peening

Laser Shock Peening to enhance stress corrosion cracking and corrosion fatigue resistance in marine aluminium alloys

Jan Kaufmana, Jan Racekb, Miroslav Cieslarc, Peter Minárikc, Matthew A. Steinerd, Seetha R. Mannavad, Vijay K. Vasudevane, Jan Brajerb, Jan Pilařb, Ladislav Pínaa, Tomáš Mocekb

Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Břehová 78/7, Prague, Czech Republic – jan.kaufman@hilase.cz , ladislav.pina@fjfi.cvut.cz

HiLASE Centre, Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, Prague, Czech Republic – jan.racek@hilase.cz , jan.brajer@hilase.cz , jan.pilar@hilase.cz , tomas.mocek@hilase.cz

Charles University, Faculty of Mathematics and Physics, Ke Karlovu 2027/3, Prague, Czech Republic – cieslar@met.mff.cuni.cz , peter.minarik@mff.cuni.cz

University of Cincinnati, Mechanical and Materials Engineering Department, 2901 Woodside Drive, Cincinnati, OH, USA- steinemh@ucmail.uc.edu , mannava@yahoo.com

University of North Texas, Department of Materials Science and Engineering, 1155 Union Cir, Denton, TX, USA – Vijay.Vasudevan@unt.edu

Introduction

5xxx series aluminium alloys are high strength-to-weight ratio weldeable materials known for their exceptional performance in extreme environments such as seawater. Due to their excellent corrosion resistance, they are commonly used in the marine industry for the construction of hulls and other ship-related structures. However, when exposed to elevated temperatures, the alloys undergo a process known as sensitization and become susceptible to intergranular corrosion (IGC). This then leads to intergranular stress corrosion cracking (IGSCC) and corrosion fatigue (CF) which can result in catastrophic failures.

Objectives

LSP both with and without (LPwC) protective coating was applied on sensitized AA5083-H116 to improve corrosion behaviour in sea water in terms of IGC resistance and mechanical RS improvement. Despite LSP being primarily used to induce compressive residual stresses, its effect on the material microstructure in terms of electrochemical behaviour has also been investigated.