Corrosion resistance of duplex stainless steel subjected to long-term annealing in the spinodal decomposition temperature range

• Published in: Corrosion science Vol. 55; pp. 267 - 271
• Main Authors: Lo, K.H., Kwok, C.T., Chan, W.K., Zeng, D.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2012; Elsevier
• Subjects: A. Alloy; A. Steel; Annealing; Applied sciences; B. Electrochemical calculation; Chromium; Corrosion; Corrosion environments; Corrosion resistance; Diffusion; Duplex stainless steels; Exact sciences and technology; Ferrite; Healing; Metals. Metallurgy; Spinodal decomposition; A. Alloy; A. Steel; B. Electrochemical calculation; Annealing; Heat treatment; Austenitic ferritic steel; Spinodal decomposition; Annealing temperature; Corrosion resistance; Corrosion; Stainless steel; Duplex stainless steel; Calculation; Dual phase steel
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2011.10.027

► Long-term DLEPR data on duplex stainless steel. ► Spinodal decomposition remains unabated even after 15,000h of annealing. ► Effect of long-term annealing on healing has been investigated. The effect of thermal annealing up to 15,000h between 300°C and 500°C on the corrosion resistance of the duplex stainless steel (DSS) 7MoPLUS has been investigated by using the DLEPR test. Spinodal decomposition in 7MoPLUS is unabated even after annealing for 15,000h and no healing has been observed. The possible healing mechanisms in this temperature range (back diffusion of Cr atoms from the Cr-rich ferrite (αCr) and diffusion of Cr atoms from the austenite) and its absence in the present steel have been discussed.