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Open AccessArticle

Investigation of Thermally Induced Deterioration Processes in Cold Worked SAF 2507 Type Duplex Stainless Steel by DTA

1
Department of Materials Science and Engineering, Budapest University of Technology and Economics, Bertalan Lajos utca 7, 1111 Budapest, Hungary
2
Institute of Materials and Manufacturing Sciences, Óbuda University, Népszínház utca 8, 1034 Budapest, Hungary
3
Department of Materials Physics, Eötvös Loránd University, Pázmány Péter sétány 1/a, 1117 Budapest, Hungary
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(10), 937; https://doi.org/10.3390/cryst10100937
Received: 3 September 2020 / Revised: 9 October 2020 / Accepted: 12 October 2020 / Published: 14 October 2020
(This article belongs to the Special Issue Investigation of Duplex Stainless Steel)
Thermally induced deterioration processes were studied in cold worked (up to 60% deformation) SAF 2507 type super-duplex stainless steel (SDSS) by differential thermal analysis (DTA). DTA results revealed two transformations. Parent and inherited phases of these transformations were examined by other methods too, such as micro-hardness tests, optical metallography and X-ray diffraction (XRD). Finally, these transformations were identified as the formation of α’- and σ-phases. Formation of strain-induced martensite (SIM) and recrystallization were not experienced until 1000 °C, despite high degree of cold working. Activation energies of the σ-phase precipitation and α’-phase formation were determined from the Kissinger plot, through DTA measurements—they are 275 and 220 kJ/mol, respectively—in good agreement with the values found in the literature. View Full-Text
Keywords: duplex stainless steel; differential thermal analysis; X-ray diffraction; sigma-phase; activation energy duplex stainless steel; differential thermal analysis; X-ray diffraction; sigma-phase; activation energy
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MDPI and ACS Style

Berecz, T.; Fazakas, É.; Fábián, E.R.; Jenei, P.; Maróti, J.E. Investigation of Thermally Induced Deterioration Processes in Cold Worked SAF 2507 Type Duplex Stainless Steel by DTA. Crystals 2020, 10, 937.

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