The different matrix volume ratio of ferrite to austenite were prepared of HDR duplex stainless steels by so-lution treatment at 1 100～1 400 ℃.Microelectrochemical and Micro-scan vibration technology(SVET)were used for tes-ting,Combined with scanning electron microscopy(SEM)and Energy Dispersive Spectrometer(EDS)was used to ana-lyze the changes in tissue composition and the distribution characteristics of elements.The results showed that after solu-tion treatment at 1 100～1 400 ℃,the main alloying elements(Cr,Mo,Mn,Ni,N)of HDR duplex stainless steel were re-distributed between ferrite and austenite,changing the distribution of alloying elements in dual phase and the proportion of the dual phase in the entire structure.The proportion of ferrite has increased from 50.3％to 93.2％,and the HDR an-nealed at 1 100 ℃ has the smallest pitting pits and the best resistance to pitting.The pitting potential first decreases,then increases,and then decreases in fluctuation,and the fluctuation point is at 1 250 ℃,while the weak phase transforms from ferrite structure to austenite structure.The greater the micro electrochemical activity and the potential gradient(△E)of the dual phase,the more severe the pitting.However,compared to the original sample,and the worse resistance were oc-cured for the samples after solution treatment.
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