With　synergy　of　plastic　deformation　near　crack　tip　and　pulse　current　treatment,　complex　phase　transformation　and　recrystallization　occur　in　the　metallographic　structure,　with　the　austenite　transforming　to　fine　grain　structure　and　deformation-induced　martensite;　but,　without　the　plastic　deformation,　the　phase　transformation,　and　recrystallization　it　was　difficult　for　the　crack　arrest　process　to　take　place　only　undergoing　the　pulse　current　treatment.　The　nano-indentation　experiment　showed　that　the　phase　transformation　region　contained　the　maximum　residual　compressive　stress　consisting　of　four　parts:　the　plastic　stress,　the　explosion　stress,　the　thermal　stress,　and　the　transformation　stress,　which　was　beneficial　to　restrain　the　crack　growth.　However,　the　solidification　structure　and　the　deformation-induced　martensite　structure　was　vulnerable　to　pitting　corrosion　through　scanning　microelectrode　technology　(SMET)　and　pitting　corrosion　experiment,　but　the　pitting　corrosion　resistance　could　be　improved　through　the　solution　heat　treatment.