Effect of the Heat Treatment on the Corrosion Resistance of Duplex Stainless Steels

Pezzato, Luca; Lago, Mattia; Brunelli, Katya; Breda, Marzia; Calliari, Irene

doi:10.1007/s11665-018-3408-5

Cited by 50 publications

(12 citation statements)

References 24 publications

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“…In fact, RA, given its low amount of internal defects, reduces the amount of residual stress in the material, making it less susceptible to corrosion. This agreed with the results in the literature [ 26 , 27 , 28 ].…”

Section: Resultssupporting

confidence: 93%

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Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

et al. 2021

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A novel high silicon austempered (AHS) steel has been studied in this work. The effect of different austenitizing temperatures, in full austenitic and biphasic regime, on the final microstructure was investigated. Specimens were austenitized at 780 °C, 830 °C, 850 °C and 900 °C for 30 min and held isothermally at 350 °C for 30 min. A second heat treatment route was performed which consisted of austenitizing at 900 °C for 30 min and austempering at 300 °C, 350 °C and 400 °C for 30 min. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) have been used to evaluate the microstructural evolution. These techniques revealed that the microstructures were composed of carbide-free bainite, ferrite, martensite and retained austenite (RA) in different volume fractions (Vγ). An aqueous borate buffer solution with 0.3 M H3BO3 and 0.075 M Na2B4O7∂10H2O (pH = 8.4) was used for corrosion tests in order to evaluate the influence of the different volume fractions of retained austenite on the corrosion properties of the specimens. The results showed that when increasing the austenitization temperatures, the volume fractions of retained austenite reached a maximum value at 850 °C, and decrease at higher temperatures. The corrosion properties were investigated after 30 min and 24 h immersion by means of potentiodynamic polarization (after 30 min) and electrochemical impedance spectroscopy (after both 30 min and 24 h) tests. The corrosion resistance of the samples increased with increases in the volume fraction of retained austenite due to lower amounts of residual stresses.

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Section: Resultssupporting

confidence: 93%

“…Microstructural modification induced by heat treatments could influence corrosion resistance, as observed by several authors both in low-alloyed carbon steels [ 24 ] and in high-alloyed steel, such as stainless steel [ 25 ] and duplex stainless steel (DSS) [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

et al. 2021

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“…The corrosion resistance was evaluated by mean of the critical pitting temperature test (CPT) in order to correlate the microstructure modifications to the corrosion properties [15].…”

Section: Methodsmentioning

confidence: 99%

Microstructural and Corrosion Properties of Cold Rolled Laser Welded UNS S32750 Duplex Stainless Steel

Gennari

Lago

Bögre

et al. 2018

Metals

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The main goal of this work was to study the effect of plastic deformation on weldability of duplex stainless steel (DSS). It is well known that plastic deformation prior to thermal cycles can enhance secondary phase precipitation in DSS which can lead to significant change of the ferrite-austenite phase ratio. From this point of view one of the most important phase transformation in DSS is the eutectoid decomposition of ferrite. Duplex stainless steels (DSSs) are a category of stainless steels which are employed in all kinds of applications where high strength and excellent corrosion resistance are both required. This favorable combination of properties is provided by their biphasic microstructure, consisting of ferrite and austenite in approximately equal volume fractions. Nevertheless, these materials may suffer from several microstructural transformations if they undergo heat treatments, welding processes or thermal cycles. These transformations modify the balanced phase ratio, compromising the corrosion and mechanical properties of the material. In this paper, the microstructural stability as a consequence of heat history due to welding processes has been investigated for a super duplex stainless steel (SDSS) UNS S32750. During this work, the effects of laser beam welding on cold rolled UNS S32750 SDSS have been investigated. Samples have been cold rolled at different thickness reduction (ε = 9.6%, 21.1%, 29.6%, 39.4%, 49.5%, and 60.3%) and then welded using Nd:YAG laser. Optical and electronical microscopy, eddy’s current tests, microhardness tests, and critical pitting temperature tests have been performed on the welded samples to analyze the microstructure, ferrite content, hardness, and corrosion resistance. Results show that laser welded joints had a strongly unbalanced microstructure, mostly consisting of ferritic phase (~60%). Ferrite content decreases with increasing distance from the middle of the joint. The heat-affected zone (HAZ) was almost undetectable and no defects or secondary phases have been observed. Both hardness and corrosion susceptibility of the joints increase. Plastic deformation had no effects on microstructure, hardness or corrosion resistance of the joints, but resulted in higher hardness of the base material. Cold rolling process instead, influences the corrosion resistance of the base material.

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“…Their report shows the process has significant influence on the corrosion resistance of both steels due to changes in the contents of σ and δ phases, precipitation of M7C3 and secondary hardening. Pezzato et al showed in their research that precipitation of secondary phases on duplex steel after isothermal aging affect the corrosion resistance of the alloy. Research by Tukur et al shows sensitization leading to carbide precipitations at grain boundaries of 304 austenitic stainless steel occurs when exposed to elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of cyclic heat treatment process on the pitting corrosion resistance of EN‐1.4405 martensitic, EN‐1.4404 austenitic, and EN‐1.4539 austenitic stainless steels in chloride‐sulfate solution

Loto

2020

Engineering Reports

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Effect of cyclic heat treatment process on the pittingcorrosion resistance of EN-1.4405 martensitic, EN-1.4404 austenitic, and EN-1.4539 austenitic stainless steels in chloride-sulfate solution Abstract The effect of high temperature variation on the corrosion resistance of EN-1.4405, EN-1.4404, and EN-1.4539 stainless steels in 2 M H 2 SO 4 /3.5% NaCl solution was studied. Untreated EN 1.4405 exhibited the highest corrosion rate at 4.775 mm/year compared to untreated EN 1.4539 with the lowest corrosion rate (1.043 mm/year). Repetitive heat treatment significantly decreased the corrosion rate of the steels by 54.61%, 27.83%, and 50.28% to 2.167, 1.396, and 0.519 mm/year. EN-1.4539 steel exhibited the shortest metastable pitting activity among the untreated steels due to higher resistance to transient pit formation while heat treated EN-1.4404 and EN-1.4539 steels exhibited double metastable pitting activity. Heat treated EN-1.4405 was unable to passivate after anodic polarization signifying weak corrosion resistance. Pitting current of heat-treated steels was generally higher than the untreated counterparts. Heat treatment extended the passivation range value of EN-1.4405 and EN-1.4539 steels compared to those of the untreated steels. The corrosion potential of heat-treated steels significantly shifted to electronegative values. The optical image of untreated and heat treated EN-1.4404 and EN-1.4539 steels were generally similar while the images for EN-1.4405 significantly contrast each other.

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Effect of the Heat Treatment on the Corrosion Resistance of Duplex Stainless Steels

Cited by 50 publications

References 24 publications

Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

Microstructural and Corrosion Properties of Cold Rolled Laser Welded UNS S32750 Duplex Stainless Steel

Effect of cyclic heat treatment process on the pitting corrosion resistance of EN‐1.4405 martensitic, EN‐1.4404 austenitic, and EN‐1.4539 austenitic stainless steels in chloride‐sulfate solution

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