Fatigue Crack Growth Resistance of Heat-Resistant Steel 15H11MF After Operation in Blades of a Steam Turbine

Krechkovska, Halyna; Hredil, Myroslava; Student, О. Z.

doi:10.1007/978-3-030-97822-8_28

Structural Integrity

2022

DOI: 10.1007/978-3-030-97822-8_28

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Fatigue Crack Growth Resistance of Heat-Resistant Steel 15H11MF After Operation in Blades of a Steam Turbine

Halyna Krechkovska

Myroslava Hredil

О. Z. Student

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Cited by 4 publications

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“…4b, c). Such technological defects of steam turbine blades were considered one of the main reasons for their premature destruction [28,29]. These cracks were recorded on the transverse section.…”

mentioning

confidence: 99%

Establishing the causes of premature damage of steam turbine rotor blades of TPP

Solovei,

Student,

Svirska

et al. 2023

Visnyk TNTU

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The technical condition of the metal of the steam turbine blade was analyzed and the reasons for its fracture were established. It was shown that the relative elongation δ of the blade metal varied from 7.4 to 11.5%, and was lower than the regulated level. The low values of δ and the obtained values of the ratio between yield strength and ultimate tensile strength σYS / σUTS, which varied from 0.8 to 0.89, indicate a low margin of plasticity of the blade metal, which contributed to its cracking under the action of working loads. Metallographic analysis revealed pores in the surface-hardened layer of the blade. They caused low adhesion of the layer with the base metal of the blade, and also of crack initiation. The high stress concentration and the contact of the blade metal with the working medium contributed to the growth of a subcritical corrosion-fatigue crack in the cross-section up to its complete destruction.

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mentioning

confidence: 99%

Establishing the causes of premature damage of steam turbine rotor blades of TPP

Solovei,

Student,

Svirska

et al. 2023

Visnyk TNTU

Self Cite

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Substantiation of the critical structural and mechanical state of low-alloy heat-resistant steel from steam pipelines of thermal power plant

Krechkovska

Student

Zvirko

et al. 2023

Engineering Failure Analysis

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Peculiarities of fatigue fracture of high-alloyed heat-resistant steel after its operation in steam turbine rotor blades

Krechkovska

Hredil

Student

et al. 2023

International Journal of Fatigue

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Fatigue Crack Growth Resistance of Heat-Resistant Steel 15H11MF After Operation in Blades of a Steam Turbine

Cited by 4 publications

References 7 publications

Establishing the causes of premature damage of steam turbine rotor blades of TPP

Establishing the causes of premature damage of steam turbine rotor blades of TPP

Substantiation of the critical structural and mechanical state of low-alloy heat-resistant steel from steam pipelines of thermal power plant

Peculiarities of fatigue fracture of high-alloyed heat-resistant steel after its operation in steam turbine rotor blades

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