Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS
1
CPCM, Dept. Ciència de Materials i Química Física, Facultat de Química, Universitat de Barcelona, E-08028 Barcelona, Spain
2
PROCOMAME, Dept. Ciència dels Materials i Enginyeria Metal·lúrgica, EEBE, Universitat Politècnica de Catalunya, E-08019 Barcelona, Spain
3
Institute of Metallurgical Research, Universidad Michoacana de San Nicolás de Hidalgo UMSNH, Av. Francisco Múgica s/n, CU, Morelia 58230, Mexico
*
Author to whom correspondence should be addressed.
Materials 2020, 13(1), 165; https://doi.org/10.3390/ma13010165
Received: 11 December 2019
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Revised: 22 December 2019
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Accepted: 25 December 2019
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Published: 1 January 2020
(This article belongs to the Special Issue Advances in Duplex Stainless Steels)
In this study, the effect of a plasma ion carburizing process to duplex and superduplex stainless steels (DSS and SDSS), at 925 °C for a long time, as thermochemical process influencing the microstructural evolution is presented. The objective is to analyse the diffusion elements’ influence on the precipitation of secondary phases after additional short thermal treatment. A comparison among the different treatments was performed after the resulting microstructures were analysed by Field Emission—Scanning Electron Microscope. Precipitation of secondary phases—sigma (σ), chi (χ), nitrides and carbides—seemed to occur during the treatments in a similar way for both steels (DSS and SDSS), although they showed a different morphology and precipitation mode. General corrosion behaviour of untreated and treated samples was investigated by potentiodynamic tests in order to prove their corrosion resistance. It was found that an improvement of the surface protection after the plasma carburizing process occurred.
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Keywords:
corrosion; duplex stainless steel; plasma ion carburizing; superduplex stainless steel; secondary phases; thermal treatments
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MDPI and ACS Style
Biserova-Tahchieva, A.; Cabrera, J.M.; Llorca-Isern, N. Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS. Materials 2020, 13, 165. https://doi.org/10.3390/ma13010165
AMA Style
Biserova-Tahchieva A, Cabrera JM, Llorca-Isern N. Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS. Materials. 2020; 13(1):165. https://doi.org/10.3390/ma13010165
Chicago/Turabian StyleBiserova-Tahchieva, Alisiya, Jose M. Cabrera, and Nuria Llorca-Isern. 2020. "Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS" Materials 13, no. 1: 165. https://doi.org/10.3390/ma13010165
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