Evaluation of Si Content in FeSiCrNi Alloys Containing Carbon on Cyclic Oxidation Resistance at 950 °C

Pereira, Júlia Nascimento; Souza, Vinícius Fernandes de; Malafaia, Artur Mariano de Sousa

doi:10.1007/s11085-021-10035-w

Cited by 3 publications

(1 citation statement)

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“…The development of the sigma phase can be successfully retarded by the addition of carbon and nitrogen [21]. Low silicon addition has been shown to reduce the oxidation rate of ferritic Fe-Cr and austenitic Fe-Cr-Ni steels by forming a very thin Si fayalite layer between chromium scale on the surface of the alloy and the alloy-such a Si layer provides a barrier to chromium transport from the alloy to the surface [1,6,9,[19][20][21][22][23][24] [25]. Buscail and others [26,27] studied the effect of molybdenum on the oxidation of stainless steel at 900°C and 1000°C and found that molybdenum affects oxidation similarly to silicon.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Cycling High Temperature Corrosion at 650°C in the Presence of NaCl of Various Austenitic Stainless Steels

Leban

Vončina

Kosec

et al. 2022

High Temperature Corrosion of mater.

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The high temperature corrosion at 650°C in the presence of NaCl at atmospheric pressure of AISI 304L, AISI 309, AISI 310S, AISI 314 and AISI 321 austenitic stainless steel was studied. The specimens were cyclically heated in the furnace and immersed in a 3.5% aqueous NaCl solution after cooling for 15 min. After each cycle, the change in mass of the samples was measured. The corroded samples were analysed by SEM /EDX, and the corrosion products were analysed by XRD. The chloride ions react with the steel surface to form porous and poorly adherent oxides and metal chlorides. After the mass increase during the first exposure cycles, spalling of the oxides occurred. The high temperature austenitic stainless steels (AISI 309, AISI 310S, AISI 314) showed less mass loss than conventional austenitic steels (AISI 304L). Surprisingly, the stainless steel AISI 321 showed a similar low weight loss after the cyclic test as AISI 309, but a detailed analysis of the exposed surfaces after the test showed a similar corrosion attack as for AISI 304. After the cyclic test at high temperature in the presence of NaCl, a higher concentration of Cr and Ni definitely improves the corrosion resistance under the present conditions, but a certain addition of Si is even more obvious. Graphical Abstract

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