Fretting fatigue crack analysis of the turbine blade from nuclear power plant

Xue, Fei; Wang, Zhao‐Xi; Zhao, Wensheng; Zhang, Xiaoliang; Qu, Baoping; Liu, Wei

doi:10.1016/j.engfailanal.2014.05.006

Cited by 17 publications

(3 citation statements)

References 19 publications

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“…From the macrograph image, there is no evidence of surface crack and corrosion on the components, only pitted surfaces were observed with average size 10-18 μm. 11 With the appearances of jagged and pitted, it was suspected that fretting behaviour existed at both surfaces.…”

Section: Collar 25cmmentioning

confidence: 99%

Wear characteristics of commercial gas turbine components

Pauzi

Ghazali

Yunus

et al. 2016

Tribology - Materials, Surfaces & Interfaces

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Wear is one of the common degradations in a commercial gas turbine. A stainless steel grade 304 (SS 304) fuel nozzle and its collar made of nickel-based superalloy (Hastelloy X) are two vital components that normally suffer from rapid wear. During an installation, the fuel nozzle is slotted into the collar of the combustion liner. In operation, these two surfaces are subjected to high pressure from the fuel combustion, hence continuously rubbing against each other causes vibrations. During the start-stop operation, these surfaces had undergone a large relative motion. The vibration is the main cause of the wear occurrence on the surfaces. Physical properties of the worn surfaces were obtained through visual observations: wear measurement, hardness and microstructure examination. Through visual observations, fretting wear was mainly suspected as the dominant wear mode, particularly after 8,000 of running hours at high temperature and vibration. In short, this paper discusses the preliminary findings of wear on the fuel nozzle and its collar. It also discusses the changes in the mechanical properties before and after the operation. Solutions for mitigating the problem were discussed.

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Section: Collar 25cmmentioning

confidence: 99%

Wear characteristics of commercial gas turbine components

Pauzi

Ghazali

Yunus

et al. 2016

Tribology - Materials, Surfaces & Interfaces

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“…After investigating a blade failure in a low-pressure turbine at a nuclear power plant, one concludes that low clearance between the blade and the disc caused a sliding movement. A crack in the blade started under fretting wear and propagated with high cycle fatigue by analyzing the blade fracture surface 16 .…”

Section: Introductionmentioning

confidence: 99%

Fretting Fatigue In-service Failure of X20CrMo13 Stainless Steel Turbine Blade

2021

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The turbine blades play a crucial role in the efficiency of the steam turbines system, which can also lead to safety and economic implications in a catastrophic failure. The propagation of fatigue cracks is a relevant issue, especially if there are safety issues involving human life or the environment or significant economic losses. This work investigated the failure of a turbine blade of a 25 MW cogeneration power plant. One found several deformation marks and debris in the primary crack origin at the blade's base. They were responsible for the fretting fatigue type wear. The blade material matches the composition of X20CrMo13 steel; however, the hardness shows a higher average value (250±4.7) than typical standard values of 220-240 HB.

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“…Fretting is found in almost all fields of technology in which mating elements meet the conditions listed above -elements of airplanes [1], medical implants [2,3], and elements of nuclear power plants [4,5] may be mentioned here.…”

Section: Introductionmentioning

confidence: 99%

The influence of a CrN+a-C:H:W coating on the development of fretting wear in a model of a wheel–axle press-fit joint on a wheel set of a railway vehicle

Kowalski

2018

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The tests were conducted on a wheel/axle press-fit joint model, which consisted of a shaft and a sleeve. Macrographic observations were demonstrated fretting wear on the shaft surface with and without coatings. In the case of the uncoated shaft, wear around the entire circumference of the axle seat was visible in the form of a peculiar ring of a specific width. The coated shaft surface was distinguished by a considerably smaller number of visible traces of wear. Wear was observed around the entire circumference of the axle seat, was spaced at random, and insignificantly sized areas each time. Micrographic observations with the use of a scanning microscope demonstrated that fretting was primarily comprised of the build-up of the material from both surfaces joined together. In addition to the build-up, surface micro-abrasion, micropits and microcracks are observed, albeit to a lesser extent.

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Fretting fatigue crack analysis of the turbine blade from nuclear power plant

Cited by 17 publications

References 19 publications

Wear characteristics of commercial gas turbine components

Wear characteristics of commercial gas turbine components

Fretting Fatigue In-service Failure of X20CrMo13 Stainless Steel Turbine Blade

The influence of a CrN+a-C:H:W coating on the development of fretting wear in a model of a wheel–axle press-fit joint on a wheel set of a railway vehicle

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