Nuclear Engineering and Technology

  • 제53권9호
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  • Pages.2982-2989
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  • 2021
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Evaluation of 475 ℃ embrittlement in UNS S32750 super duplex stainless steel using four-point electric conductivity measurements

  • Gutierrez-Vargas, Gildardo (Instituto de Investigacion en Metalurgia y Materiales, Universidad Michoacana de San Nicolas de Hidalgo) ;
  • Ruiz, Alberto (Instituto de Investigacion en Metalurgia y Materiales, Universidad Michoacana de San Nicolas de Hidalgo) ;
  • Lopez-Morelos, Victor H. (Instituto de Investigacion en Metalurgia y Materiales, Universidad Michoacana de San Nicolas de Hidalgo) ;
  • Kim, Jin-Yeon (GWW School of Mechanical Engineering, Georgia Institute of Technology) ;
  • Gonzalez-Sanchez, Jorge (Center for Corrosion Research, Autonomous University of Campeche) ;
  • Medina-Flores, Ariosto (Instituto de Investigacion en Metalurgia y Materiales, Universidad Michoacana de San Nicolas de Hidalgo)
  • 투고 : 2020.01.09
  • 심사 : 2021.03.20
  • 발행 : 2021.09.25
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초록

One of the consequences of the 475 ℃ embrittlement of duplex stainless steels is the reduction of the resistance to localized corrosion. Therefore, the detection of this type of embrittlement before the material exhibits significant loss in toughness, and corrosion resistance is important to ensure the structural integrity of critical components under corrosion threats. In this research, conductivity measurements are performed using the alternating current potential drop (ACPD) technique with using a portable four-point probe as a nondestructive evaluation (NDE) method for detecting the embrittlement in a 2507 (UNS S32750) super duplex stainless steel (SDSS) aged at 475 ℃ from as-received condition to 300 h. The electric conductivity results were compared against two electrochemical tests namely double loop electrochemical potentiokinetic reactivation (DL-EPR) and critical pitting temperature (CPT). Mechanical tests and the microstructure characterized using scanning electron microscopy (SEM) imaging are conducted to track the progress of embrittlement. It is shown that the electric conductivity correlates with the changes in impact energy, microhardness, and CPT corrosion tests result demonstrating the feasibility of the four-point probe as a possible field-deployable method for evaluating the 475 ℃ embrittlement of 2507 SDSS.

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과제정보

This work was supported by SENER-CONACYT Mexico under the project: CEMIE-Geo-P18. The authors wish to thank the Universidad Michoacana de San Nicolas de Hidalgo (Coordinacion de la Investigacion Cientifica for their support). Gildardo Gutierrez Vargas wish to thank CONACYT-MEXICO for the support provided during his doctoral studies.

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