Influence of Deformation on Corrosion Resistance of the New Duplex Transformation Induced Plasticity (TRIP) Stainless Steels UNS S82012 and UNS S82031

摘要

Duplex stainless steels combine many of the beneficial properties of ferritic and austenitic stainless steels, such as high mechanical strength and good localized and uniform corrosion resistance in a wide range of environments. The recently developed duplex stainless steels UNS S82012 and UNS S82031 utilize Transformation Induced Plasticity (TRIP) effect and exhibit significantly improved formability properties compared to conventional duplex grades. The TRIP-effect comprises of a controlled transformation of metastable austenite to martensite during cold forming operations. It is of interest to investigate the impact of deformation on the corrosion properties of new formable duplex grades. In this study, the influence of deformation on uniform and localized corrosion properties, as well as environmentally induced cracking properties was investigated. Several types of corrosion tests were performed on both carefully deformed laboratory specimens and actual formed components of UNS S82012 and UNS S82031. Also, standard austenitic grades were included in the study for the sake of comparison.