International Journal of Electrochemical Science   2016 年 11 卷 6 期

2016.06.01

Strain-induced martensite in a newly developed lean duplex stainless steel (DSS) 2002 after tensile deformation was characterized by optical metallographic microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and electron backscatter diffraction techniques. Magnetic property measurement and HV hardness test of specimens with different strains were performed. The polarization curves of DSS 2002 after tensile deformation in 3.5 wt.% NaCl (pH ~ 7) and 3.5 wt.% NaCl + 0.01 mol/L HCl (pH ~ 2) were measured. The results showed that as the tensile deformation increased from 0 to 40%, the volume fraction of strain-induced martensite, the magnetization saturation and the micro-hardness values increased. The pitting potential of DSS 2002 in 3.5 wt.% NaCl solution was not greatly influenced by deformation but the critical passivation current density of specimens increased with increasing deformation. While, the pitting potential of DSS 2002 in 3.5 wt.% NaCl + 0.01 mol/L HCl decreased with the increase of tensile deformation. The effect of tensile deformation on anodic polarization properties of DSS 2002 in chloride solutions of different pH was discussed.