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Laser Shock Peening (LSP) of stainless-steel 316 and 316L was studied usingTi: Sapphire laser pulses of about 2 ps duration, maximum energy of about 1mJand pulse repetition rate of 5kHz in different liquid confinement media ofEthanol, Deionized water and separate aqueous solutions of NaCl and Glycerol.It is found that the laser fluence and/or energy attenuating mechanisms likeself-focusing, filamentation, plasma breakdown in the confinement media areless significant with ps laser pulses than those with sub-ps or fs pulsedurations. It is shown that the resulting surface hardness of the peened steelas a function of laser fluence depends significantly on the confinement mediaand the relative increase in the hardness increases monotonically with theacoustic impedance of the liquid of the confinement medium used during LSP.

Studies on ultra-short pulsed laser shock peening of stainless-steel in different confinement media