Metalografska preiskava in korozijska odpornost zvarov feritnega nerjavnega jekla

Torkar, M.; Kocijan, Aleksandra; Celin, Roman; Burja, Jaka; Podgornik, Bojan

doi:10.17222/mit.2016.059

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…This chemical property is beneficial for the breaking of the surface metal-metal bonds during the early stages of spontaneous prepassivation. 32,33 Thus, Cr-rich compounds are the first to be formed on the coupon surfaces. These corrosion products primarily prevent the permeation of the corrosion ions in the electrolyte solution and protect the steel substrate.…”

Section: Surface Morphologymentioning

confidence: 99%

Corrosion behavior of low-alloy steel used for flexible pipes exposed to a seawater environment

Liu¹,

Gao²,

Du³

et al. 2019

Mater. Tehnol.

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An immersion experiment was carried out to illustrate the corrosion behavior of low-alloy steel used for flexible pipes in a seawater environment in terms of corrosion kinetics, corrosion phases, surface morphology, cross-sectional morphology and elemental distribution. The experimental results show that the corrosion rate with an exponential format is linear with respect to the corrosion time with an exponential format. The main corrosion phases are goethite (a-FeOOH), lepidocrocite (g-FeOOH), iron oxide (Fe2O3) and magnetite (Fe3O4). Corrosion products become denser and thicker with the increasing corrosion time. Cr-rich compounds are the first to be formed on the coupon surfaces. The effects of the alloying elements on the corrosion products are different. Chromium is rich in the area near the steel substrate. Iron, oxygen and molybdenum are homogeneously distributed throughout the corrosion products. Keywords: corrosion behavior, low-alloy steel, flexible pipe, seawater Avtorji so izvajali preizkuse potapljanja fleksibilnih cevi iz malo legiranega jekla v morsko vodo, da bi ugotovili njihovo odpornost proti koroziji z vidika kinetike korozije, nastajanja korozijskih faz, morfologije povr{ine in preseka cevi ter porazdelitve elementov. Preizkusi so pokazali, da je hitrost korozije eksponentno odvisna od~asa. Glavne korozijske faze so getit (a-FeOOH), lepidokrokit (g-FeOOH), hematit (Fe2O3) in magnetit (Fe3O4).^im dlje je cev v vodi, tem bolj nara{~a debelina in gostota korozijskih produktov. Najprej nastajajo s Cr bogate faze. Vplivi razli~nih legiranih elementov na korozijo so razli~ni. Krom je najve~v obmo~ju blizu jekla. @elezo, kisik in molibden pa so homogeno porazdeljeni po korozijskih produktih.

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Section: Surface Morphologymentioning

confidence: 99%

Corrosion behavior of low-alloy steel used for flexible pipes exposed to a seawater environment

Liu¹,

Gao²,

Du³

et al. 2019

Mater. Tehnol.

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Influence of Isothermal Annealing in the 600 to 750 °C Range on the Degradation of SAF 2205 Duplex Stainless Steel

Burja,

Žužek,

Šetina Batič

2024

CMD

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We studied the effect of isothermal annealing (600–750 °C, 1 to 1000 min) on the microstructure and mechanical properties of SAF 2205 duplex stainless steel. Impact toughness was found to be significantly more affected than hardness by annealing. Annealing at 750 °C for 1000 min resulted in a more than 90% decrease in impact toughness, while hardness only increased by 25%. Tensile strength increased up to 100 MPa, but elongation decreased by more than 50% under the same conditions. Sigma phase formation was minimal at lower temperatures (650 °C and below) but increased significantly at higher temperatures. At 750 °C and 1000 min of annealing, the ferrite content dropped from 50% to 16%. These findings suggest that annealing temperature and time need to be carefully controlled to avoid a reduction in impact toughness and ductility caused by sigma phase precipitation. The harmful effect of sigma phase precipitation on mechanical properties was directly shown.

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Metalografska preiskava in korozijska odpornost zvarov feritnega nerjavnega jekla

Cited by 2 publications

References 5 publications

Corrosion behavior of low-alloy steel used for flexible pipes exposed to a seawater environment

Corrosion behavior of low-alloy steel used for flexible pipes exposed to a seawater environment

Influence of Isothermal Annealing in the 600 to 750 °C Range on the Degradation of SAF 2205 Duplex Stainless Steel

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