Structural Transformations in Duplex Stainless Steel CF8 Under Intensive Cold Plastic Deformation
Vereshchak M. Manakova I. Yeshmanova G. Tleubergenov Z.
December 2024Multidisciplinary Digital Publishing Institute (MDPI)
Metals
2024#14Issue 12
The austenitic–martensitic transformation in austenitic–ferritic duplex stainless steel CF8 subjected to cold plastic deformation with a deformation degree ε = 10–95% is studied here using transmission Mössbauer spectroscopy (MS), conversion electron Mössbauer spectroscopy (CEMS), and X-ray diffraction (XRD) methods. It is assumed that the α′-martensite phase appeared at ε > 10%. The CEMS results showed that the formation of α′-martensite occurred most intensively in the near-surface layers of the steel, distributing in depth with the growth of the deformation degree. The volume fraction of the α′-martensite was determined based on the results of calculations carried out via the MS and XRD methods, and a good correlation was observed. A modified Olson–Cohen model was proposed to determine the dependence of the amount of α′-martensite on the deformation degree ε. The coefficients included in the Olson–Cohen expression were found.
austenite , martensite , Mössbauer spectroscopy , plastic deformation , stainless steel CF8 , X-ray diffraction
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Institute of Nuclear Physics, Ibragimov St. 1, Almaty, 050032, Kazakhstan
Institute of Nuclear Physics
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