Solid-particle erosion and protective layers for steam turbine blading

Mann, Ben

doi:10.1016/s0043-1648(98)00305-6

Cited by 28 publications

(22 citation statements)

References 6 publications

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“…Beside this, a technology developed by GE power system known Advances in Mechanical Engineering as taggant coating system can be used to detect any blade corrosion or erosion of blade. Any detection of the coated material at exhaust collector can be used as the indication of the presence of corrosion and erosion of the Mann [95].…”

Section: Blade Deformation (Creep Twisting Erosion and Corrosion)mentioning

confidence: 99%

Condition Monitoring of Blade in Turbomachinery: A Review

Abdelrhman

Hee

Leong

et al. 2014

Advances in Mechanical Engineering

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Blade faults and blade failures are ranked among the most frequent causes of failures in turbomachinery. This paper provides a review on the condition monitoring techniques and the most suitable signal analysis methods to detect and diagnose the health condition of blades in turbomachinery. In this paper, blade faults are categorised into five types in accordance with their nature and characteristics, namely, blade rubbing, blade fatigue failure, blade deformations (twisting, creeping, corrosion, and erosion), blade fouling, and loose blade. Reviews on characteristics and the specific diagnostic methods to detect each type of blade faults are also presented. This paper also aims to provide a reference in selecting the most suitable approaches to monitor the health condition of blades in turbomachinery.

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Section: Blade Deformation (Creep Twisting Erosion and Corrosion)mentioning

confidence: 99%

Condition Monitoring of Blade in Turbomachinery: A Review

Abdelrhman

Hee

Leong

et al. 2014

Advances in Mechanical Engineering

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“…However, little work has been carried out on the influence of micro-particles on wet steam erosion, although extensive researches have been conducted in each field, respectively [8]. Actually, the ferric oxides will be peeled from the inside of the superheated tube [9], thus the particles will inevitably exist in the steam. Many reports indicated that the particles have significant impact on the erosion of materials.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Erosion Damages Induced by Wet Steam Containing Micro-Particles

Wang

Qin

et al. 2010

Tribol Lett

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Based on the self-developed experimental apparatus, the wet steam erosion experiments were performed on polished steel specimens. Scanning Electronic Microscope (SEM) and Atomic Force Microscope (AFM) were used to identify the pit characteristics. The experimental results showed that there was little damage on the surface after being impacted by wet steam erosion. However, when the micro-particles were added into the wet steam, not only indentations and scratches but also craters appeared on the eroded surface. Some characteristics of crater, such as the circular shape and intergranular fractures, make the damages distinguish from those of the water-drop or micro-particle impact to solid wall, and they are considered as the results of cavitation erosion.

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“…During the initial hours of operation (around 80,000 h), little or no erosion is observed; however, after an additional 40,000 h of operation, severe erosion occurs. In fact, the leading edges of inlet buckets of a typical 800-MW steam turbine have eroded 12-13 mm from their original dimensions in this time increment (Ref [1][2][3]. This is because a magnetite (brittle oxide) layer builds up to a certain point and then cracks/spalls usually due to temperature transient during start up or during major load change.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Erosion Protection of TWAS Coated Ti6Al4V Alloy Using Boride Bond Coat and Subsequent Laser Treatment

Mann

Arya

Pant

2010

J. of Materi Eng and Perform

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The material commonly used in low-pressure high-rating super critical/ultra super critical steam turbines as well as guide and moving blades of high speed aero compressors is Ti6Al4V alloy. These blades are severely affected owing to erosion which leads to drop in efficiency and increase in maintenance cost. This article deals with SHS 7170 coating on Ti6Al4V alloy using twin wire arc spraying (TWAS), enhancing its bonding by providing a thin bond coat and then treating with high-power diode laser (HPDL). Significant improvement in erosion resistance of this multilayer coating has been achieved because of the formation of fine-grained micro structure due to rapid heating and cooling rates associated with the laser surface treatment. After laser surface treatment, the fracture toughness of this multilayer has improved manifold. The water droplet and particulate erosion test results along with the damage mechanism are reported and discussed in this article.

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Solid-particle erosion and protective layers for steam turbine blading

Cited by 28 publications

References 6 publications

Condition Monitoring of Blade in Turbomachinery: A Review

Condition Monitoring of Blade in Turbomachinery: A Review

Investigation of Erosion Damages Induced by Wet Steam Containing Micro-Particles

Enhanced Erosion Protection of TWAS Coated Ti6Al4V Alloy Using Boride Bond Coat and Subsequent Laser Treatment

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