Ranking of the Mechanical Characteristics of Steels of Steam Pipelines of Thermal Power Plants by Their Sensitivity to In-Service Degradation

Student, О. Z.; Krechkovska, Halyna; Svirs’ka, L. M.; Kindratskyi, B. I.; Shyrokov, V. V.

doi:10.1007/s11003-021-00554-x

Cited by 10 publications

(1 citation statement)

References 18 publications

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“…Long-term operation of the WJ on the main steam piping of the TPP practically did not affect the hardness of the BM (Figure 1b). This indicates a low sensitivity of hardness to BM degradation, and it is consistent with the low sensitivity of the strength characteristics of BM to operational degradation [46]. At the same time, the HB hardness of the operated WM more strongly decreased and became even lower than the hardness of the BM.…”

Section: Sensitivity Of Hardness To Weld Joint Degradationsupporting

confidence: 80%

Analysis of Mechanical Properties of Welded Joint Metal from TPP Steam Piping after Its Operational Degradation and Hydrogenation

Hutsaylyuk,

Student,

Maruschak

et al. 2023

Materials

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In this paper, the mechanical properties of various zones of the welded joints of a heat-resistant steel 15Kh1M1F in different states (in the initial state, after an operation on the main steam piping of a thermal power plant (TPP) for 23 years) were determined, and the fracture surfaces were analyzed using scanning electron microscopy (SEM) images. The effect of hydrogen electrolytic charging on mechanical behavior and fracture mechanism was also studied. The long-term operation of welds resulted in a higher degradation degree of the weld metal compared to the base one, indicated by the deterioration of mechanical properties: decrease in hardness, strength characteristics, and reduction in area, which was accompanied by an atypical increase in elongation at fracture. All studied zones of the operated welded joints were characterized by higher hydrogen content, 2.5–3 times higher than that in the initial state. Additional hydrogen charging of the weld joint metal led to a decrease in the strength and ductility characteristics, more significantly for the operated weld compared with the non-operated one. This justified the possibility of using short-term tests of hydrogenated WM in the air to assess the degree of its damage during operation on a steam piping.

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Section: Sensitivity Of Hardness To Weld Joint Degradationsupporting

confidence: 80%