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Title: Sensitization phenomena on aged SAF 2205 duplex stainless steel and their control using the electrochemical potentiokinetic reactivation test

Abstract

Microstructural changes and resulting properties were studied for SAF 2205 (UNS S31803) austeno-ferritic stainless steel (SS) aged between 700 C and 900 C for up to 2 weeks and then water-quenched. Quantitative metallography coupled with x-ray diffraction techniques were adopted to follow ferrite ([alpha]) transformation with subsequent formation of secondary austenite ([gamma][sub 2]) and sigma ([sigma]) phase. The kinetic model of a transformation was interpreted in the form of an Avrami-type expression. The electrochemical potentiokinetic reactivation (EPR) test was used to evaluate the degree of sensitization of the aged specimens. Results were compared with results from the corrosion test in boiling nitric acid (HNO[sub 3]). Influences of the transformation of ferrite into austenite, sigma phase, and of other microstructural variations such as chromium nitride (Cr[sub 2]N) precipitation on stability of the passive film were shown. The susceptibility to intergranular corrosion phenomena was caused by chromium depletion caused by sigma phase precipitation, while chromium nitrides appeared less harmful. Results were expressed as an isocharge line diagram that allowed concise identification of sensitization and desensitization ranges.

Authors:
; ; ;  [1]
  1. Politecnico, Torino (Italy). Dept. of Materials Science and Chemical Engineering
Publication Date:
OSTI Identifier:
6200803
Resource Type:
Journal Article
Journal Name:
Corrosion
Additional Journal Information:
Journal Volume: 55:6; Journal ID: ISSN 0010-9312
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AGING; AUSTENITE; CORROSION; FERRITE; FILMS; METALLOGRAPHY; MICROSTRUCTURE; PRECIPITATION; STAINLESS STEELS; X-RAY DIFFRACTION; ALLOYS; CARBON ADDITIONS; CHEMICAL REACTIONS; COHERENT SCATTERING; DIFFRACTION; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; SCATTERING; SEPARATION PROCESSES; STEELS; 360102* - Metals & Alloys- Structure & Phase Studies; 360105 - Metals & Alloys- Corrosion & Erosion

Citation Formats

Angelini, E, Benedetti, B de, Maizza, G, and Rosalbino, F. Sensitization phenomena on aged SAF 2205 duplex stainless steel and their control using the electrochemical potentiokinetic reactivation test. United States: N. p., 1999. Web. doi:10.5006/1.3280502.
Angelini, E, Benedetti, B de, Maizza, G, & Rosalbino, F. Sensitization phenomena on aged SAF 2205 duplex stainless steel and their control using the electrochemical potentiokinetic reactivation test. United States. https://doi.org/10.5006/1.3280502
Angelini, E, Benedetti, B de, Maizza, G, and Rosalbino, F. 1999. "Sensitization phenomena on aged SAF 2205 duplex stainless steel and their control using the electrochemical potentiokinetic reactivation test". United States. https://doi.org/10.5006/1.3280502.
@article{osti_6200803,
title = {Sensitization phenomena on aged SAF 2205 duplex stainless steel and their control using the electrochemical potentiokinetic reactivation test},
author = {Angelini, E and Benedetti, B de and Maizza, G and Rosalbino, F},
abstractNote = {Microstructural changes and resulting properties were studied for SAF 2205 (UNS S31803) austeno-ferritic stainless steel (SS) aged between 700 C and 900 C for up to 2 weeks and then water-quenched. Quantitative metallography coupled with x-ray diffraction techniques were adopted to follow ferrite ([alpha]) transformation with subsequent formation of secondary austenite ([gamma][sub 2]) and sigma ([sigma]) phase. The kinetic model of a transformation was interpreted in the form of an Avrami-type expression. The electrochemical potentiokinetic reactivation (EPR) test was used to evaluate the degree of sensitization of the aged specimens. Results were compared with results from the corrosion test in boiling nitric acid (HNO[sub 3]). Influences of the transformation of ferrite into austenite, sigma phase, and of other microstructural variations such as chromium nitride (Cr[sub 2]N) precipitation on stability of the passive film were shown. The susceptibility to intergranular corrosion phenomena was caused by chromium depletion caused by sigma phase precipitation, while chromium nitrides appeared less harmful. Results were expressed as an isocharge line diagram that allowed concise identification of sensitization and desensitization ranges.},
doi = {10.5006/1.3280502},
url = {https://www.osti.gov/biblio/6200803}, journal = {Corrosion},
issn = {0010-9312},
number = ,
volume = 55:6,
place = {United States},
year = {Tue Jun 01 00:00:00 EDT 1999},
month = {Tue Jun 01 00:00:00 EDT 1999}
}