Effect of thermal aging at 475 degree C on the properties of lean duplex stainless steel 2101

An investigation of the effect of thermal aging at 475 degree 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 fer...

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Bibliographic Details
Published in:Materials characterization 2016-04, Vol.114, p.211-217
Main Authors: Silva, R, Baroni, LFS, Silva, MBR, Afonso, CRM, Kuri, SE, Rovere, CAD
Format: Article
Language:English
Subjects:
Aging (metallurgy)
Duplex stainless steels
Ferrite
Hardness
Magnetic permeability
Microstructure
Phases
Quantitative analysis
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Summary:An investigation of the effect of thermal aging at 475 degree 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 degree 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 degree C for up 2000h.
ISSN:1044-5803
DOI:10.1016/j.matchar.2016.03.002