High Temperature Corrosion Failure of a Secondary Superheater Tube in a Thermal Power Plant Boiler

Ghosh, Debashis; Roy, Himadri; Ray, S.; Shukla, A. K.

doi:10.1515/htmp.2009.28.1-2.109

Cited by 27 publications

(12 citation statements)

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“…Cr-Mo-V ferritic-martensitic and Cr-Ni-Mo austenitic creepresistant steels and their welded joints are frequently used in classical coal-fired as well as nuclear power plant industry for construction of boiler equipments operating at supercritical steam conditions [1][2][3]. Dissimilar welded joints of these steels are commonly produced by gas tungsten arc welding (GTAW) using Ni-based weld metals (Ni WM) of "Inconel-type" to suppress undesired "up-hill" diffusion of carbon throughout the weldments [4].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Thermal Exposure and Hydrogen Charging on the Notch Tensile Properties and Fracture Behaviour of Dissimilar T91/TP316H Weldments

Blach

Falat

2013

High Temperature Materials and Processes

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The effects of ageing and hydrogen charging on the notch tensile properties and fracture behaviour of individual heat-affected zones (HAZ) and Ni-based weld metal (Ni WM) of T91/TP316H weldments were investigated. After the post-weld heat treatment at 750 °C for 1 h the weldments were annealed at 600 °C for 1000 h and 5000 h, respectively. All heat-treated states were studied in condition without as well as with hydrogen charging. Thermal expositions led to additional precipitation and microstructure coarsening but their influence on tensile strength was insignificant. In contrast, remarkable plasticity decrease and the fracture mode transition from ductile dimple tearing to transgranular cleavage were observed. The combined effects of thermal exposure and hydrogen charging were more complex. Whereas the regions of Ni WM and TP316H HAZ did not show any significant change in strength, the hydrogen effect caused the strength increase in T91 HAZ. Although the hydrogen embrittling effects were clearly manifested by decreasing plasticity, their significance was getting smaller with increasing annealing duration. The fracture behaviour of thermally exposed and hydrogen charged regions exhibited mixed fracture modes including transgranular cleavage, intergranular dimple fracture and intergranular decohesion.

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Section: Introductionmentioning

confidence: 99%

The Influence of Thermal Exposure and Hydrogen Charging on the Notch Tensile Properties and Fracture Behaviour of Dissimilar T91/TP316H Weldments

Blach

Falat

2013

High Temperature Materials and Processes

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“…[15] High-temperature oxidation/corrosion leads to drastic material degradation of the Cr-Mo steels and finally results in premature failure of the components. [16][17][18][19][20] Preliminary investigation on the improvement of high-temperature oxidation resistance of Ni, Cr and Ni-Cr superalloys with the application of nanocrystalline ceramic powder coating are conducted by several researchers. [21][22][23] But detailed investigation on the use of nano ceria-coated Cr-Mo steels to improve the high-temperature oxidation resistance are not reported yet.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Y₂O₃plasma coating for high temperature oxidation protection

Ghosh

Roy

Mitra

2015

Journal of Adhesion Science and Technology

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This paper investigates the effect of nano-size and micron-size Y 2 O 3 powder-coated specimen on high-temperature oxidation resistance of low-alloy Cr-Mo steel (2.25 Cr-1 Mo steel). Both are powder coated by plasma spray coating method. The oxidation rate and reaction kinetics are studied and the post-corroded scales are characterized in Field Emission Scanning Electron Microscope and X-ray Diffraction. The results clearly indicate that nanosize Y 2 O 3 -coated (nanostructured) specimen improves the high-temperature oxidation resistance in comparison to the micron-size Y 2 O 3 -coated specimen. The detail mechanism of the oxidation of both the coated specimen is discussed in detail in this paper.

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“…1 High temperature corrosion of heat resistant steels has long been a critical problem for researchers, manufacturers and operators. [2][3][4][5] Much work had been conducted on the selection of steels with different Cr contents under various corrosive environments including oxy-fuel conditions. Most of these studies focused on the comparison of materials and corrosive environments.…”

Section: Introductionmentioning

confidence: 99%

High temperature corrosion of typical positions in SUS 30432 tubing bend tested in simulated environment

Sha

Liang

Suo

2014

Materials at High Temperatures

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The corrosion behaviour of typical positions in an SUS 30432 bend under simulated corrosive environments was investigated in this paper. A scanning electron microscope equipped with an energy dispersive spectrometer was used to characterise the surface and cross-section morphologies of specimens. Results show that the corrosion kinetics of all specimens were similar showing near parabolic law behaviour. The largest weight gain was located at the samples which were cut from the bottom of a bend. The corrosion scale consisted of an outer layer containing iron oxides and an inner layer containing Cr rich spinels and sulphides. The distances between grains in the samples from the bend were larger than that from the straight tube, which became smaller as the experimental time increased. It may be closely related to aggregation of dislocations near the grain boundaries after tube bending.

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High Temperature Corrosion Failure of a Secondary Superheater Tube in a Thermal Power Plant Boiler

Cited by 27 publications

References 1 publication

The Influence of Thermal Exposure and Hydrogen Charging on the Notch Tensile Properties and Fracture Behaviour of Dissimilar T91/TP316H Weldments

The Influence of Thermal Exposure and Hydrogen Charging on the Notch Tensile Properties and Fracture Behaviour of Dissimilar T91/TP316H Weldments

Nanostructured Y₂O₃plasma coating for high temperature oxidation protection

High temperature corrosion of typical positions in SUS 30432 tubing bend tested in simulated environment

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High Temperature Corrosion Failure of a Secondary Superheater Tube in a Thermal Power Plant Boiler

Cited by 27 publications

References 1 publication

The Influence of Thermal Exposure and Hydrogen Charging on the Notch Tensile Properties and Fracture Behaviour of Dissimilar T91/TP316H Weldments

The Influence of Thermal Exposure and Hydrogen Charging on the Notch Tensile Properties and Fracture Behaviour of Dissimilar T91/TP316H Weldments

Nanostructured Y2O3plasma coating for high temperature oxidation protection

High temperature corrosion of typical positions in SUS 30432 tubing bend tested in simulated environment

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Nanostructured Y₂O₃plasma coating for high temperature oxidation protection