Impact specimen geometry on T23 and TP347HFG steels behaviour during steam oxidation at harsh conditions

Dudziak, T.; Łukaszewicz, Mikołaj; Simms, N.J.; Nicholls, John

doi:10.1080/1478422x.2016.1185568

Cited by 4 publications

(4 citation statements)

References 25 publications

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“…It is well known that high-temperature oxidation in 100% steam is characterized by faster oxidation rates than in dry or humid environments [4]; in addition, the scale formed exhibits different adherence and porosity [5,6] leading to a loss of the protective properties of chromia scale [7]. Under cyclic conditions, the oxidation resistance of ferritic-martensitic steels depends primarily on their chromium content and the rapid formation of a dense protective Cr-rich oxide scale.…”

Section: Introductionmentioning

confidence: 99%

Impact of Sample Geometry and Surface Finish on VM12-SHC Ferritic–Martensitic Steel Under Cyclic Steam Atmosphere Operating Conditions

et al. 2022

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The steam side oxidation of ferritic–martensitic VM12-SHC steel was investigated under thermo-cyclic conditions in water steam at 620/320 °C and 30 bar with a focus on assessing the influence of pre-oxidation time, specimen geometry and surface finish. The specimens were pre-oxidized under isothermal conditions in water steam at 620 °C and 30 bar for 500 h or 1500 h. After pre-oxidation treatment, all specimens were subjected up to 258 thermal cycles. Three different geometries—rectangular coupons, U-shaped ring segments and ring samples—were investigated to evaluate the influence of open/closed shape, and flat/curved surface on corrosion rate. At the same time, two types of surface finish were considered: “as received” and “ground.” The formation of a protective scale by pre-oxidation was investigated. EBSD and ESMA analyses revealed that the Cr-content of the alloy appeared to be insufficient for obtaining a protective oxide scale under studied conditions, at the same time the anayses confirmed that initial oxidation depends on presence of minor alloying elements as Si and Mn, strong oxide formers which can alter the kinetics and morphology of the corrosion reaction. Moreover, rectangular coupons with small wall thickness and flat surface exhibited the highest corrosion rate, while “ground” curved samples showed only local oxidation. This indicates that for same pre-oxidation time, oxidation kinetics is controlled by curvature.

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Section: Introductionmentioning

confidence: 99%

Impact of Sample Geometry and Surface Finish on VM12-SHC Ferritic–Martensitic Steel Under Cyclic Steam Atmosphere Operating Conditions

et al. 2022

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“…There are many papers describing the steam oxidation of heat-resistant steel used in USC power plants [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. It is well known that Cr is the indispensable element in heat-resistant steel, with excellent strength and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Viswanathan et al [ 1 ] concluded that steam oxidation of heat-resistant steel was influenced by the heat flux, environment, steam parameter, and alloy compositions. Surface pretreatments and sample geometry also affected the oxidation resistance of steels, such as sandblasting and pre-oxidation treatment [ 1 , 16 , 21 ]. Fry and Piedra [ 22 ] discussed the effect of specimen geometry, steam pressure, and dissolved oxygen of water on the oxidation behavior of heat-resistant steel.…”

Section: Introductionmentioning

confidence: 99%

Steam Oxidation of Austenitic Heat-Resistant Steels TP347H and TP347HFG at 650–800 °C

Liang

2019

Materials

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Steam oxidation of austenitic heat-resistant steels TP347H and TP347HFG at 650–800 °C was investigated. Comprehensive micro-characterization technologies containing Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD), and X-ray Photoelectron Spectroscopy (XPS) were employed to observe and analyze the oxidation products. Results show that breakaway oxidation behaviors were observed on TP347H at 700 °C and 800 °C. The oxidation kinetics of TP347HFG at 650–800 °C followed a parabolic law. The oxide scales formed on TP347HFG were composed of MnCr2O4 and Cr2O3. A thin and protective Cr-rich oxide scale was replaced by Fe2O3 nodules due to the insufficient outward migration of metallic ions, including Cr and Mn at the subsurface of coarse-grain TP347H. Smaller grain of TP347HFG promoted the formation of the compact Cr-rich oxide scales. At higher temperatures, the incubation period for breakaway oxidation of the Cr-rich oxide scale was much shorter because of quick evaporation of the Cr2O3 oxide scale and the slower outward diffusion of metallic ions via the grain boundaries.

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“…Lukaszewicz conducted a series of studies on the steam oxidation behavior of various materials in the laboratory, in additional, he reported some results from an investigation into the impact of steam flow rates and sample orientation on the steam oxidation of surface ground superheater tube materials. [20][21][22]. However, there are few studies on the comparison of steam oxidation behavior of various austenitic steels in long-term service environment (over 15,000 h).…”

Section: Introductionmentioning

confidence: 99%

Investigation on Oxidation Behavior of Super304H and HR3C Steel in High Temperature Steam from a 1000 MW Ultra-Supercritical Coal-Fired Boiler

Wang

et al. 2019

Energies

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Oxidation behavior of Super304H and HR3C steel in high temperature steam from an ultra-supercritical coal-fired boiler was investigated in this paper. The results showed that the steam oxidized surface of Super304H ware composed of Fe2O3, Cr2O3 and FeCr2O4, the oxide scale had a thickness of 50–70 μm. In addition, the steam oxidized surface of HR3C ware composed of Fe2O3, the oxide scale was about 20μm in thickness and contained few pitting. The oxidation product layer of the two samples could be divided into two layers, including outer layer enriched O element and Fe element, and inner layer enriched O element and Cr element. Furthermore, oxide scale spalling was observed on the surface of Super304H sample.

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Impact specimen geometry on T23 and TP347HFG steels behaviour during steam oxidation at harsh conditions

Cited by 4 publications

References 25 publications

Impact of Sample Geometry and Surface Finish on VM12-SHC Ferritic–Martensitic Steel Under Cyclic Steam Atmosphere Operating Conditions

Impact of Sample Geometry and Surface Finish on VM12-SHC Ferritic–Martensitic Steel Under Cyclic Steam Atmosphere Operating Conditions

Steam Oxidation of Austenitic Heat-Resistant Steels TP347H and TP347HFG at 650–800 °C

Investigation on Oxidation Behavior of Super304H and HR3C Steel in High Temperature Steam from a 1000 MW Ultra-Supercritical Coal-Fired Boiler

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