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

Author:  J. Kaufman1,2, M. A. Steiner3, S. R. Mannava3, V. K. Vasudevan4, J. Brajer2, J. Pilař2, L. Pína1, T. Mocek2 1 Faculty of Nuclear Sciences and Physical Engineering, CTU in Prague, Czechia 2 HiLASE Centre, Institute of Physics of the Czech Academy of Scienc
Source:  ICSP14 Milan
Doc ID:  2022070
Year of Publication:  2022
Abstract:  
Abstract This paper shows the effects of Laser Shock Peening (LSP), an alternative to Shot Peening, on marine aluminium alloys. LSP generated compressive residual stresses which varied depending on the peening strategy and method of confinement. Electrochemical tests indicated a region of increased passivity samples without protective coating as well as significantly reduced intergranular corrosion rate. 3-point bend tests showed significant improvement in fatigue strength. Slow strain rate testing showed strong work hardening of treated specimens although the influence on IGSCC was not clearly indicated. Keywords marine aluminium alloys, laser shock peening, intergranular corrosion, sensitization