Failure analysis of the 350MW steam turbine blade root

Abstract Steam turbine blade is a very complex structure. It has geometric complexities like variation of twist, taper, width and thickness along its length. Most of the time these variations are not uniform. Apart from these geometric complexities, the blades are coupled by means of lacing wire, lacing rod or shroud. Blades are attached to a flexible disc which contributes to the dynamic behavior of the blade. Root fixity also plays an important role in this behavior. There is a considerable variation in the frequencies of blades of newly assembled turbine and frequencies after some hours of running. Again because of manufacturing tolerances there can be some variation in the blade to blade frequencies. Determination of natural frequencies of the blade is therefore a very critical job. Problems associated with typical industrial turbine bladed discs of a 235 MW steam turbine are highlighted in this paper.

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Failure analysis of steam turbine blade roots

Engineering Failure Analysis ◽

10.1016/j.engfailanal.2020.104629 ◽

2020 ◽

Vol 115 ◽

pp. 104629

Author(s):

Hua He ◽

Zhunbei Zheng ◽

Zhanjun Yang ◽

Xiaochen Wang ◽

Yuxing Wu

Keyword(s):

Failure Analysis ◽

Steam Turbine ◽

Turbine Blade ◽

Steam Turbine Blade

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Non-destructive testing Techniques based on Failure Analysis of Steam Turbine Blade

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/576/1/012038 ◽

2019 ◽

Vol 576 ◽

pp. 012038

Author(s):

Li Tian ◽

Yan Hai ◽

Zeng Qingyue ◽

Yin Qin

Keyword(s):

Failure Analysis ◽

Steam Turbine ◽

Turbine Blade ◽

Non Destructive Testing ◽

Destructive Testing ◽

Steam Turbine Blade ◽

Testing Techniques ◽

Non Destructive

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Damage causes and failure analysis of a steam turbine blade made of martensitic stainless steel after 72000 hours of working

Engineering Failure Analysis ◽

10.1016/j.engfailanal.2021.105801 ◽

2021 ◽

pp. 105801

Author(s):

Rivaz ◽

S.H. Mousavi Anijdan ◽

M. Moazami-Goudarzi ◽

A.Nazari Ghohroudi ◽

H.R. Jafarian

Keyword(s):

Stainless Steel ◽

Failure Analysis ◽

Steam Turbine ◽

Turbine Blade ◽

Martensitic Stainless Steel ◽

Steam Turbine Blade

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Steam Turbine Blade MMM Testing and Failure Analysis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.139-141.2561 ◽

2010 ◽

Vol 139-141 ◽

pp. 2561-2564 ◽

Cited By ~ 1

Author(s):

Hai Yan Xing ◽

Da Bo Wu ◽

Li Hong Zhang ◽

Min Qiang Xu

Keyword(s):

Failure Analysis ◽

Steam Turbine ◽

Turbine Blade ◽

Material Property ◽

Mechanical Effect ◽

Material Behavior ◽

Magnetic Memory ◽

Fracture Face ◽

Effect Theory ◽

Steam Turbine Blade

Metal magnetic memory (MMM) method, based on the magneto-elasticity and mechanical effect theory, is a new nondestructive testing technology. This paper aims at the material property and failure analysis for steam turbine blade with MMM method. The failure blade and its fracture face are tested with MMM technology at workshop. It has been found that the MMM signal variation gradient of the crack transition zone in the fracture face is minimal, that of the crack initiation zone is in the middle, and that of the tear fracture zone is maximal. MMM testing results reflect material behavior degradation of the failure blade. In order to proof the MMM results, the dynamic stress of the steam turbine blade under the operation loading is calculated by WESTHOMES software and analyzed theoretically. It has proved the validity of the MMM method applied on material property evaluation and failure analysis for steam turbine blade.

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