抄録
Duplex stainless steel (DSS) provides excellent mechanical strength and corrosion resistance and its application
has been expanding to diverse industrial fi elds where strong corrosion resistance and mechanical
strength are simultaneously desired. For the enhancement of surface hardness and wear resistance of
DSS, various surface treatment techniques have been adopted previously, which however produced
mostly minor improvement of corrosion resistance or occasional degradation of corrosion behavior. In
this study, the results of laser shock peening of DSS are presented in comparison with those of previously
attempted methods. It was demonstrated that the surface hardness, wear resistance, and corrosion resistance
of DSS can be simultaneously increased by properly applied laser shock peening process. The
maximum surface hardness enhancement of 29%, wear volume decrease of 66%, and corrosion rate decrease
of 74% were achieved by water immersion type laser shock peening and similar results were also
obtained by nozzle type laser shock peening.
