Abstract
An investigation of the effect of thermal aging at 475°C for up to 2000h on the properties of a lean duplex stainless steel (LDSS) 2101 was conducted. Quantitative analyses of XRD based on Rietveld refinement revealed that the thermal aging did not affect the volumetric proportions of the ferrite/austenite phases present in the duplex microstructure. However, results from ferritoscope measurements showed a decrease in magnetic permeability of the ferrite after a prolonged exposure to 475°C. In addition, the hardness of the ferritic phase increased significantly with the aging time and saturated after 600h, resulting in a drastic decrease in Charpy impact energy. On the other hand, DL-EPR tests showed that the degree of Cr depletion (Qr/Qa)×100 increased continuously as a function of the thermal aging at 475°C for up 2000h.
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