Detail publikace
Corrosion Resistance of Cast Duplex Steels
MÜLLER, P. PERNICA, V. KAŇA, V.
Anglický název
Corrosion Resistance of Cast Duplex Steels
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
The aim of this work is to investigate the resistance of cast duplex (austenitic-ferritic) steels to pitting corrosion with respect to the value of PREN (Pitting Resistance Equivalent Number). Pitting corrosion is one of the most common types of corrosion of stainless steels. In most cases, it is caused by the penetration of aggressive anions through the protective passive layer of the steel, and after its disruption, it leads to subsurface propagation of corrosion. The motivation for the research was a severe pitting corrosion attack on the blades of the gypsumcalcium water mixer in a thermal power plant operation. In order to examine the corrosion resistance, 4 samples of 1.4517 steel with different concentrations of alloying elements (within the interval indicated by the steel grade) and thus with a different PREN value were cast. The corrosion resistance of the samples was evaluated by the ASTM G48 – 11 corrosion test in a 6% aqueous FeCl3 solution at room and elevated solution temperatures. To verify the possible effect of different alloying element concentrations on the mechanical properties, the research was supplemented by tensile and Charpy impact tests. Based on the results, it was found that a significant factor in the resistance of duplex steels to pitting corrosion is the temperature of the solution. For the components in operation, it is therefore necessary to take this effect into account and thoroughly control and manage the temperature of the environment in which the components operate.
Anglický abstrakt
The aim of this work is to investigate the resistance of cast duplex (austenitic-ferritic) steels to pitting corrosion with respect to the value of PREN (Pitting Resistance Equivalent Number). Pitting corrosion is one of the most common types of corrosion of stainless steels. In most cases, it is caused by the penetration of aggressive anions through the protective passive layer of the steel, and after its disruption, it leads to subsurface propagation of corrosion. The motivation for the research was a severe pitting corrosion attack on the blades of the gypsumcalcium water mixer in a thermal power plant operation. In order to examine the corrosion resistance, 4 samples of 1.4517 steel with different concentrations of alloying elements (within the interval indicated by the steel grade) and thus with a different PREN value were cast. The corrosion resistance of the samples was evaluated by the ASTM G48 – 11 corrosion test in a 6% aqueous FeCl3 solution at room and elevated solution temperatures. To verify the possible effect of different alloying element concentrations on the mechanical properties, the research was supplemented by tensile and Charpy impact tests. Based on the results, it was found that a significant factor in the resistance of duplex steels to pitting corrosion is the temperature of the solution. For the components in operation, it is therefore necessary to take this effect into account and thoroughly control and manage the temperature of the environment in which the components operate.
Klíčová slova anglicky
Cast duplex steel; Pitting resistance equivalent number; Ferric chloride; Critical pitting temperature; Mechanical properties
Vydáno
03.08.2022
Nakladatel
POLSKA AKAD NAUK, POLISH ACAD SCIENCES
Místo
WARSZAWA
ISSN
2299-2944
Ročník
2022
Číslo
3
Strany od–do
5–10
Počet stran
6
BIBTEX
@article{BUT182312,
author="Peter {Müller} and Vítězslav {Pernica} and Václav {Kaňa},
title="Corrosion Resistance of Cast Duplex Steels",
year="2022",
volume="2022",
number="3",
month="August",
pages="5--10",
publisher="POLSKA AKAD NAUK, POLISH ACAD SCIENCES",
address="WARSZAWA",
issn="2299-2944"
}