Towards Understanding the Oxide Evolution in Inconel 740H and Haynes 282 in Ambient Pressure Steam Oxidation

Gore, Poorwa; Gosain, Om Puri; Singh, Manpreet; Basu, Bikramjit; Chattopadhyay, K.

doi:10.1007/s11085-022-10103-9

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…Beneath the Cr 2 O 3 layer, a ~10 µm deep zone of internal oxidation consisting of mainly Al 2 O 3 and small amounts of TiO 2 is evident. Comparable observations for the oxidation of the Inconel 740H were made by Gore et al [51].…”

Section: Oxidation Of Inconel 740h Uncoated Inconel 740hsupporting

confidence: 56%

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Novel Cr/Si-Slurry Diffusion Coatings for High Temperatures

Kerbstadt,

White,

Galetz

2023

Materials

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Surface enrichment in Al, Si, and Cr can greatly improve high temperature oxidation resistance of many alloys. Al, Si, and Cr coatings are commonly applied via simple slurries or more complex pack cementation processes. Due to the high melting point of Cr, the deposition of Cr-based diffusion coatings by the slurry technique has proved challenging, and to date, Cr has mostly been applied by pack cementation. Here, a novel Cr-Si coating process via the slurry technique is described which has been developed and then demonstrated on two Ni-based superalloys, Rene 80 and Inconel 740H. The addition of Si to the slurry lowers the melting point via a Cr-Si eutectic and enables the formation of a liquid phase during heat treatment. Through this Cr-Si slurry coating process diffusion layers enriched by Cr and Si of about 150 µm were achieved. Oxidation behavior was studied through isothermal exposures at 900 °C for 1000 h in lab air. Uncoated Rene 80 and IN740H both showed formation of a Ti-containing Cr2O3 scale below a thin TiO2 top layer. Underneath the external scale a zone of internally oxidized Al grew over the exposure time and reduced the load-bearing cross-section progressively. In comparison, the Cr/Si-coated samples did not show internal Al oxidation, but a slow-growing Si-rich oxide film underneath the external Cr2O3 scale. This subscale represents an additional oxygen diffusion barrier. Thus, the weight gain during exposure for the coated samples was significantly lower than for the uncoated materials.

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Section: Oxidation Of Inconel 740h Uncoated Inconel 740hsupporting

confidence: 56%

“…Net mass change during quasi-isothermal oxidation exposure of Cr/Si-coated and uncoated Inconel 740H for up to 1000 h at 900 °C in air.Beneath the Cr2O3 layer, a ~10 µm deep zone of internal oxidation consisting of mainly Al2O3 and small amounts of TiO2 is evident. Comparable observations for the oxidation of the Inconel 740H were made by Gore et al[51].…”

supporting

confidence: 56%

Novel Cr/Si-Slurry Diffusion Coatings for High Temperatures

Kerbstadt,

White,

Galetz

2023

Materials

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“…This alloy has been considered a suitable candidate for several power generation applications, such as thermal power plants with super-critical CO 2 [5] and concentrated solar power plants [6]. Inconel 740H in its wrought form has been investigated to determine several critical properties such as corrosion, oxidation, and fatigue resistance for its use in these applications [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Achieving High Strength and Creep Resistance in Inconel 740H Superalloy through Wire-Arc Additive Manufacturing and Thermodynamic-Guided Heat Treatment

Sridar,

Ladinos Pizano,

Klecka

et al. 2023

Materials

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Inconel 740H superalloy is commonly used in advanced ultra-supercritical power plants since it possesses excellent strength and creep resistance. This study investigates the microstructure and mechanical properties of Inconel 740H superalloy fabricated using wire-arc additive manufacturing. The as-printed microstructure consisted of columnar γ grains with the Laves phase and (Nb, Ti)C carbides as secondary phases. The anisotropy in grain structure increased from the bottom to the top regions, while the hardness was highest in the middle portion of the build. To guide the post-heat treatment design, thermodynamic and kinetic simulations were employed to predict the temperature and time. Complete recrystallization with the Laves phase dissolution occurred throughout the build after homogenization at 1200 °C for 2 h. The peak hardness was achieved after aging at 760 °C for 12 h with the M23C6 carbides decorating the grain boundaries and γ’ precipitates in the grain interior. The yield strength (655 MPa) and ductility (29.5%) in the post-heat treated condition exceeded the design targets (620 MPa, 20%). Stress rupture tests at 750 °C showed that the high-temperature performance was at par with the wrought counterparts. The fracture mode after rupture was identified to be intergranular with the presence of grain boundary cavities along with grain boundary sliding.

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Effects of Reduction‐Oxidation Cycles on the Structure, Heat and Corrosion Resistance of Haynes 282 Nickel Alloy Manufactured by Using Powder Bed Fusion‐Laser Beam Method

Kamiński,

Adamczyk‐Cieślak,

Kopec

et al. 2024

Materials & Corrosion

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The study investigated the effect of the oxidation–reduction cycles on the structure and corrosion resistance of the Haynes 282 nickel superalloy at ambient and elevated temperatures. The comparative studies were performed on specimens produced by the Powder Bed Fusion‐Laser Beam (PBF‐LB) process and those in the as‐received state. The microstructure of the PBF‐LB specimens was studied using optical and scanning electron microscopy, whereas the chemical composition of the scale formed after isothermal oxidation in an air atmosphere at 750°C was analysed using energy‐dispersive X‐ray spectroscopy and X‐ray Photoelectron Spectroscopy. The phase composition of the formed scale was determined by X‐ray diffraction. Laboratory‐induced hydrogen atmosphere was adopted through cathodic charging. A comparison of corrosion resistance was carried out on two types of Haynes 282 specimens, before and after the oxidation and cathodic charging processes. It was found that PBF‐LB process could be effectively used to manufacture Haynes 282 nickel superalloy with low porosity and a fine crystalline microstructure. The low‐porous, fine‐crystalline microstructure of the tested specimens produced by the PBF‐LB technique exhibited good resistance to electrochemical corrosion, slightly lower than wrought Haynes 282 nickel superalloy specimens.

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Towards Understanding the Oxide Evolution in Inconel 740H and Haynes 282 in Ambient Pressure Steam Oxidation

Cited by 5 publications

References 14 publications

Novel Cr/Si-Slurry Diffusion Coatings for High Temperatures

Novel Cr/Si-Slurry Diffusion Coatings for High Temperatures

Achieving High Strength and Creep Resistance in Inconel 740H Superalloy through Wire-Arc Additive Manufacturing and Thermodynamic-Guided Heat Treatment

Effects of Reduction‐Oxidation Cycles on the Structure, Heat and Corrosion Resistance of Haynes 282 Nickel Alloy Manufactured by Using Powder Bed Fusion‐Laser Beam Method

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