Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel (LDSS) 2002 was investigated through the potentiostatic critical pitting temperature (CPT) tests and the Charpy impact test...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2019-06, Vol.32 (6), p.755-763
Main Authors: Sun, Tian-Yi, Guo, Yan-Jun, Jiang, Yi-Ming, Li, Jin
Format: Article
Language:English
Subjects:
Aging
Aging (metallurgy)
Characterization and Evaluation of Materials
Charpy impact test
Chemistry and Materials Science
Corrosion and Coatings
Corrosion effects
Corrosion resistance
Duplex stainless steels
Electrodes
Energy
Equilibrium
Grain boundaries
Impact tests
Materials Science
Mechanical properties
Metallic Materials
Morphology
Nanotechnology
Organometallic Chemistry
Pitting (corrosion)
Precipitates
Scanning electron microscopy
Spectroscopy/Spectrometry
Stainless steel
Temperature
Tribology
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Summary:The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel (LDSS) 2002 was investigated through the potentiostatic critical pitting temperature (CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm 2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr 2 N and M 23 C 6 along the ferrite–austenite grain boundaries.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-018-0829-y