Steam Oxidation Resistance of Advanced Steels and Ni-Based Alloys at 700 °C for 1000 h

Dudziak, T.; Jura, K.; Polkowska, Adelajda; Deodeshmukh, Vinay; Warmuzek, M.; Witkowska, M.; Ratuszek, W.; Chruściel, K.

doi:10.1007/s11085-017-9818-1

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…However, the key challenge is to select or develop suitable materials to withstand increasingly aggressive environment. Haynes 282 (H282) is one of the candidate materials [2]. Although it was firstly developed as a wrought materials in 2005 [3], due to its good creep strength, weldability and fabricability [4,5], it attracts the attention from casting applications.…”

Section: Introductionmentioning

confidence: 99%

Optimization of large cast Haynes 282 based on thermal induced cracks: formation and elimination

Yang

2024

Mechanics & Industry

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Haynes 282, a wrought material, attracts the attention from casting application due to its excellent mechanical properties. Fracture of large cast Haynes 282 were found before yielding during tensile test in previous researches, but the reasons have not been fully understood. In this study, various heat treatments were designed and applied for large cast Haynes 282 to reveal the fracture before yielding. Thermodynamic calculation, residual stress calculation combined with microstructural examination were utilized to analyze the reasons of fracture. It has been found that there are grain boundary cracking and grain boundary precipitate cracking in the tensile sample. The grain boundary cracking is mostly attributed to the melting of the low melting point phases such as some segregated matrix and μ phases. The grain boundary precipitate cracking is associated with the blocky Ti, Mo rich MC carbides, and it is more likely to be caused by the quenching after the second homogenization treatment. Optimized heat treatment has been proposed and proven to be workable for the large cast Haynes 282.

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Section: Introductionmentioning

confidence: 99%

Optimization of large cast Haynes 282 based on thermal induced cracks: formation and elimination

Yang

2024

Mechanics & Industry

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“…HR3C heat-resistant steel (25Cr-20Ni-Nb-N steel) is a new type of austenitic heat-resistant steel improved by adding Nb and N in the basis of TP310 heat-resistant steel [1][2][3][4]. HR3C steel is widely used in supercritical and ultra-supercritical units due to its excellent properties, and HR3C steel has high oxidation resistance and high temperature corrosion resistance, which is more suitable than 18-8 type heat-resistant steel in ultra-supercritical unit boiler environment [5][6][7][8]. Lyta et al [9] studied the microstructure evolution of the new austenitic stainless-steel Fe-20Cr-30Ni-2Nb (at%) during the oxidation process under the condition of water vapor at 800°C.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Oxidation Behavior of HR3C Steel at 700°C in Water Vapor

Song

Wang

2022

mater

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HR3C is an advanced heat-resistant alloy, and its high-temperature oxidation resistance directly determines the service performance of the material. Therefore, exploring the high-temperature oxidation behavior of HR3C is of great significance for the theoretical research and practical application of the material. The oxidation kinetic curve, oxide film morphology, oxide film composition, and oxide film phase composition of HR3C samples in the supply state after being oxidized in water vapor at 700°C for 50h, 150h, 250h, 350h, 450h, 550h and 600h were analyzed by SEM (Scanning Electron Microscopy), EDS (Energy Dispersive Spectroscopy) and XRD (X-ray diffraction). The results show that the oxidation kinetic curve of the material conforms to the parabolic law, the oxide film first forms a lamellar oxide, and the lamellar oxide film grows alternately to form a loose and porous oxide film surface, the oxide is composed of three oxides: Fe 3 O 4 , FeCr 2 O 4 and Fe 2 O 3 . The FeCr 2 O 4 is a spinel compound, which can form a dense oxide film, and the diffusion coefficient of metal ions in it is small, which hinders the diffusion and mass transfer of ions, thereby improving the high temperature oxidation resistance of stainless steel. The element Cr is mainly enriched in the inner oxide layer, and the element Fe is relatively high in the outer oxide layer.

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“…Ni-based superalloys are currently the only option for use in advanced ultra supercritical (AUSC) power plants where steam temperatures are above 700 °C and pressures are above 35 MPa [1]. Haynes 282 was induced by Haynes International in 2005 [2] as a wrought material and was first considered for boiler components for AUSC power plants because of its outstanding thermal stability [3]. Due to its good creep resistance [4] and good resistance to post weld heat treatment cracking [5], it also attracted attention for turbine casing and valve applications [6,7], which require a casting process to facilitate their complicated geometry.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of Large Cast Haynes 282 at Elevated Temperature

Yang

2021

Crystals

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Haynes 282 has attracted attention for casting applications in AUSC power plants due to its good creep properties. However, the market is primarily comprised of wrought Haynes 282, while the cast version is not commercially available. In this study, the microstructure of a large traditional sand cast Haynes 282 was studied from as-cast condition to long-term heat-treated condition by combining experimental data and thermodynamic calculations. The microstructure of a large cast Haynes 282 includes γ, γ’, two types of MX, M23C6 and µ phases. After standard post heat treatment, µ phases were dissolved and precipitated as M6C. The equilibrium state was achieved after 266 h aging at 788 °C, after which γ’ particles began coarsening. These kept to a spherical morphology; the smallest misfit was found with the γ matrix. Once post heat treatment was finished, MX exhibited little morphology and compositional change during the long-term isothermal aging. Grain boundary is covered by discrete M23C6 and M6C precipitates and this morphology keeps stable during isothermal aging. No presence of the needle µ phase have been found at grain boundaries after 10,000 h aging at 788 °C. All these microstructural features indicated that cast Haynes 282 could have a high thermal stability and good creep properties.

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Steam Oxidation Resistance of Advanced Steels and Ni-Based Alloys at 700 °C for 1000 h

Cited by 11 publications

References 13 publications

Optimization of large cast Haynes 282 based on thermal induced cracks: formation and elimination

Optimization of large cast Haynes 282 based on thermal induced cracks: formation and elimination

Analysis on Oxidation Behavior of HR3C Steel at 700°C in Water Vapor

Microstructural Evolution of Large Cast Haynes 282 at Elevated Temperature

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