High Temperature Corrosion of Low Alloy Steels ☆

Pinder, L.W.; Dawson, Karl; Tatlock, G. J.; Mahi, F.T.

doi:10.1016/b978-0-12-803581-8.10308-x

Cited by 4 publications

(4 citation statements)

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“…However, Fe-based alloys, such as an example steels, are the most attractive materials to be used as construction materials at elevated temperatures due to their relatively low cost. It is well known that low-alloyed steels possess very low high-temperature corrosion resistance [1,2]. On the other hand, high-temperature Febased alloys are used in almost all sectors of human life, e.g., heating elements in toasters, cooking plates, the constructive materials in turbocharger exhaust systems, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface mechanical treatment on the oxidation behavior of FeAl-model alloy

2019

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Fe-based alloys are commonly used in almost every sector of human life. For different reasons, the surfaces of the real parts are prepared using different methods, e.g., mirror-like polishing, grit-blasting, etc. The purpose of the present work is to answer the question how the surface preparation influences the oxidation behavior of Fe-based alloys. To answer this question, a high-purity model alloy, Fe-5 wt%Al, was isothermally oxidized in a thermogravimetrical furnace. The post-exposure analysis included SEM/EDS (WDS) and XRD. The surface roughness was determined by a contact and laser profilometer. The obtained results demonstrate that the mechanical surface preparation influences oxidation kinetics as well as the microstructure of the oxide scale formed on the alloy at both studied temperatures. Namely, polishing and grinding caused local formation of Fe-rich nodules and sub-layer of protective Al 2 O 3. In contrast, gritblasting leads to the formation of a thick outer Fe-oxide and internal aluminum nitridation. A significant increase in the oxidation rate of the material after gritblasting was attributed to grain refinement in the near-surface region, resulting in an increase in easy diffusion paths, namely grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Effect of surface mechanical treatment on the oxidation behavior of FeAl-model alloy

2019

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“…Meanwhile, the reason for gap formation at the inner/outer oxides interface seems to be the same as oxide cracking and spallation which commonly takes place at the oxide/alloy and oxide/coating interface. Several studies have pointed out that oxide cracking and spallation can occur due to thermal stress arising from a different in thermal expansion between oxide and the underlying materials [3,[5][6][7][8]11,19], grow stress [3,7,8,18] and the formation of other nonadhesive oxide/spinel [7]. During heating and cooling, the thermal stress can enhance the oxide crackingand spalling.…”

Section: Resultsmentioning

confidence: 99%

“…3(d) we can see that the cracks are formed on the sample surface after exposure at 1200 K for 72 ks. Generally, the cracks can be formed during high temperature oxidation or cooling period [1,3,8]. The structure of oxide scale will be discussed latter based on phase analysis and microstructure characterization.…”

Section: Resultsmentioning

confidence: 99%

“…When the steels are exposed to high temperature and oxidizing atmosphere, it forms oxide scale on their surface. It is well known that iron and alloyed steel usually form three oxides layer consisting of Fe2O3 in the outer layer, FeO on the steel surface and Fe3O4 at the Fe2O3/FeO interface [1][2][3] or two oxides layer consisting of Fe3O4 inner layer and Fe2O3 outer layer, depending on exposure temperature [2,3]. Meanwhile, the ferritic, martensitic and austenitic steels protection against oxidation and corrosion at high temperature are attributed to the formation of a protective Cr2O3 scale through selective oxidation of chromium [4][5][6][7][8].…”

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confidence: 99%

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