Microstructure evolution and corrosion behavior of 316L stainless steel subjected to torsion

The microstructure evolution of 316L stainless steels subjected to torsion deformation and its corrosion resistance in 1 M H 2 SO 4 solutions were studied. Microstructure evolution of the annealed and torsion-processed samples was characterized by x-ray diffraction and electron backscatter diffracti...

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Bibliographic Details
Published in:Materials research express 2021-08, Vol.8 (8), p.86519
Main Authors: Zhang, Pengyan, Han, Weixue, Huang, Zhenyi, Li, Guisheng, Zhang, Mingya, Li, Jinghui
Format: Article
Language:English
Subjects:
316L stainless steel
Annealing
Corrosion resistance
Corrosion resistant steels
Dislocation density
Dynamic recrystallization
Electrochemical impedance spectroscopy
Electrode polarization
Electron backscatter diffraction
Energy storage
Evolution
Martensitic transformations
Microstructure
microstructure evolution
Stainless steel
Stainless steels
Sulfuric acid
torsion deformation
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Summary:The microstructure evolution of 316L stainless steels subjected to torsion deformation and its corrosion resistance in 1 M H 2 SO 4 solutions were studied. Microstructure evolution of the annealed and torsion-processed samples was characterized by x-ray diffraction and electron backscatter diffraction techniques. The results showed that no martensitic transformation occurred during torsion deformation, while dynamic recrystallization occurred within the samples slowing down the tendency of increasing dislocation density and storage energy. Electrochemical tests including potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) were used in the 1 M H 2 SO 4 solution to evaluate the corrosion resistance of the annealed and torsion-processed samples. The results illustrated that small deformation (torsion for 1 turn) could enhance the corrosion resistance of the 316L stainless steels by increasing the stability of the passive film, the medium deformation (torsion for 3 turns) will deteriorate the corrosion resistance due to high-density dislocations formed during torsion deformation, while large deformation (torsion for 5 turns) could improve the corrosion resistance compared with the medium deformation due to the occurrence of dynamic recrystallization and the high-density deformation twins formed.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ac1ecc