Corrosion behaviour of AISI 304 stainless steel subjected to massive laser shock peening impacts with different pulse energies

• Laser shock peening caused an obvious increase of corrosion resistance of 304 steel.
• Corrosion resistance of stainless steel increased with increasing pulse energy.
• Mechanism of laser shock peening on corrosion behaviour was also entirely determined.

Effects of massive laser shock peening (LSP) impacts with different pulse energies on ultimate tensile strength (UTS), stress corrosion cracking (SCC) susceptibility, fracture appearance and electrochemical corrosion resistance of AISI 304 stainless steel were investigated by slow strain rate test, potentiodynamic polarisation test and scanning electron microscope observation. The influence mechanism of massive LSP impacts with different pulse energies on corrosion behaviour was also determined. Results showed that massive LSP impacts effectively caused a significant improvement on UTS, SCC resistance, and electrochemical corrosion resistance of AISI 304 stainless steel. Increased pulse energy can also gradually improve its corrosion resistance.

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