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Influence of long-term low-temperature aging on the microhardness and corrosion properties of duplex stainless steel
Affiliation:1. National Center for Materials Service Safety, University of Science and Technology Beijing, 30 Xueyuan Road, 100083 Beijing, China;2. Suzhou Nuclear Power Research Institute Co. Ltd., 1788 Xihuan Road, 215004 Suzhou, China;3. Fracture and Reliability Research Institute, Tohoku University, 6-6-01 Aoba AramakiAobaku, 980-8579 Sendai, Japan;1. Federal University of São Carlos (UFSCar), Departament of Chemistry, 13560-970 São Carlos – SP, Brazil;2. Federal University of São Paulo (UNIFESP), Institute of Science and Technology (ICT), São José dos Campos-SP, 12231-280, Brazil;3. Federal University of São Carlos (UFSCar), Departament of Materials Engineering, 13560-970 São Carlos – SP, Brazil;4. Helmholtz-Zentrum Geesthacht (HZG), Institute of Materials Research, Materials Mechanics, Solid State Joining Processes (WMP), Max-Planck-Str. 1, D-21502 Geesthacht, Germany;5. São Paulo State University (UNESP), Institute of Chemistry, Department of Phyical Chemistry, 14800-900 Araraquara – SP, Brazil
Abstract:An investigation was made of the influence of long-term aging (up to 7000 h) at low temperatures (300 and 400 °C) on the corrosion and mechanical properties of a 2205 duplex stainless steel. The selective corrosion behavior of austenite and ferrite phases was found to reverse in response to aging treatment at 400 °C. The degree of Cr depletion (Ir/Ia) increased considerably with the increase in aging time at 400 °C and no self-healing process was observed even after aging for 7000 h. A good correlation was observed between the electrochemical results and the microhardness of ferrite phase.
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