Hot Corrosion Behavior of Superalloy IN718 at 550 and 650 °C

Mahobia, Girija Shankar; Paulose, Neeta; Singh, Vakil

doi:10.1007/s11665-013-0532-0

Cited by 60 publications

(27 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The volatile CrCl 3 (g) diffuses outward through cracks and boundaries to the outer surface where the chlorides re-oxidize (2CrCl 3 (g) + 3/2O 2 = Cr 2 O 3 (s) + 3Cl 2 ). Thus Cl 2 was reproduced by the above process and repeatedly caused corrosion, penetrating the substrate [26]. Therefore, NaCl prevented formation of a protective scale in the initial stage and subsequently induced internal attack by allowing other salt ingredients like sulfur and vanadium.…”

Section: Discussionmentioning

confidence: 92%

“…It was also confirmed from the EDS analysis of the salt containing compounds near the fractured surface. Corrosion of the superalloy IN718 by Type-B coating was primarily by oxidation process; resulting in formation of some vanadium containing compounds and not through sulfidation reaction [26]. It is obvious from LCF data ( Table 1) that the Type-B coating was relatively more detrimental than Type-A coating at all the strain amplitudes investigated.…”

Section: Discussionmentioning

confidence: 94%

“…7). However, at lower strain amplitude the alloy possessed higher resistance to crack ini- showed that the attack by Type-A coating at 650°C was due to sulfidation reaction to cause breakdown of the external scale and advancement of hot corrosion [26]. NaCl prevented formation of protective scale in the initial stage and induced internal attack (Fig.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of hot corrosion on low cycle fatigue behavior of superalloy IN718

Mahobia

Paulose

Mannan

et al. 2014

International Journal of Fatigue

Self Cite

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of hot corrosion on low cycle fatigue behavior of superalloy IN718

Mahobia

Paulose

Mannan

et al. 2014

International Journal of Fatigue

Self Cite

View full text Add to dashboard Cite

“…With the continuous improvement of unit parameters, this poses more stringent requirements for heat-resistant steel for boilers. It is required that the boiler heat-resistant steel should have excellent high-temperature mechanical properties, high temperature oxidation resistance and high temperature molten salt corrosion resistance properties, processing performance and low cost and other characteristics [9,10], due to the long-term service under high temperature and high pressure, at the same time, the corrosion and oxidation of NaCl, Na2SO4 in the combustion chamber failed rapidly [11]. At the same time, it should have good welding performance and thermal conductivity.…”

Section: Introduction mentioning

confidence: 99%

Properties of High Temperature Oxidation of Heat-resistant Steel with Aluminium and Copper

Li¹,

Zhao²,

Yan³

et al. 2019

View full text Add to dashboard Cite

The research is focused on a novel aluminum and copper-containing heat-resistant steel. The steel was designed by the material performance simulation software JmatPro, performed high-temperature oxidation tests at 650 °C and 700 °C atmospheric conditions, and analyzed the high-temperature oxidation processes and its mechanisms.The phase transtions and surface morphology of the oxide films were studied using X-ray diffraction (XRD), electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results showed that the equilibrium phase of the test steel is composed of γ phase and δ phase at 1050 °C and tranforms to tempered martensite and δ-Fe mixed structure after heat treatment. The preferential oxidation of Fe and Cr and the internal oxidation of Al occurred during the high temperature oxidation of the test steel. The oxide films were formed with various shape and weak bonding properties after high-temperature oxidation at 650℃. To the contrary, the oxide films more regular and evenly distributed, and has a certain protective effect after high-temperature oxidation at 700 ℃. The oxide films were divided into two layers, Fe2O3 is main element in the outer layer, the inner layer is mainly consisting the oxide of Cr. However, the addition of Cu element can promote the diffusion of Al and Si elements, which is beneficial to the formation of Al2O3 and SiO2 protective oxide films and excellent in high temperature oxidation resistance.

show abstract

“…In this paper, T91 steel is taken as the benchmark, and its chemical composition is optimized by JMatPro thermodynamic simulation, and developed a new type of ferritic heat-resistant steel, improving high-temperature oxidation resistance of heat-resistant steel and the hot corrosion behavior of steel in molten salt. Coated salt corrosion method [21,22] was used to study the corrosion behavior of a new type of heatresistant steel in a molten salt environment with mass fraction of 75% Na 2 SO 4 + 25% NaCl under temperature of 700℃ in the atmosphere. Analysis of the corrosion products phase composition, sectional features, and elements distribution, the influence of Cu content on the thermal corrosion behavior of heat-resistant steel was performed.…”

Section: Introductionmentioning

confidence: 99%

The influence of Cu content on high temperature corrosion behavior of heat - resistant molten salt steel

Zhang

Zhao

et al. 2019

Matéria (Rio J.)

View full text Add to dashboard Cite

This work studies the high temperature corrosion behavior of new heat-resistant steel with salt coating method of 75%Na 2 SO 4 +25%NaCl coating on the steel surface at 700℃. The chemical composition of corrosion products and surface morphology of the corrosion layer were analyzed using X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and investigate the effect of Cu content on high temperature corrosion behavior of heat resistant steel. The results show that the thermal corrosion kinetics curve of tested steel follows the parabolic law and the surface is composed of Fe 2 O 3 and FeCr 2 O 4. The corrosion layer were divided into two layers, the outer layer was loose and porous while the inner layer was dense and continuous. The structure of the oxide film consists of various protective oxide films; with increasing of Cu content, the high-temperature corrosion resistance of heat-resistant steel was improved and the thickness of the corrosion layer was decreased which led to improving the bonding strength between the inner layer and the matrix. The results of EDS analysis shows that Cu elements can promote the outward diffusion of Cr elements to oxidation of the steel to form a Cr 2 O 3 protective oxide film for preventing the diffusion of chlorine elements, oxygen elements into the interior toward the steel with slow down the process of "activation oxidation", reduce the sensitivity of intergranular corrosion and achieve the function of protecting materials.

show abstract

Hot Corrosion Behavior of Superalloy IN718 at 550 and 650 °C

Cited by 60 publications

References 16 publications

Effect of hot corrosion on low cycle fatigue behavior of superalloy IN718

Effect of hot corrosion on low cycle fatigue behavior of superalloy IN718

Properties of High Temperature Oxidation of Heat-resistant Steel with Aluminium and Copper

The influence of Cu content on high temperature corrosion behavior of heat - resistant molten salt steel

Contact Info

Product

Resources

About