Creep and microstructural processes in a low-alloy 2.25%Cr1.6%W steel (ASTM Grade 23)

Kuchařová, K.; Sklenička, V.; Kvapilová, Marie; Svoboda, Milan

doi:10.1016/j.matchar.2015.08.008

Cited by 16 publications

(17 citation statements)

References 19 publications

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“…The larger particles grew at the expense of the smaller ones, and the distribution gradually changed from large numbers of small particles to a small number of large ones. The obtained result was consistent with the reported creep mechanism, by which the growth and redistribution of carbides resulted in decreasing the steel performance [24,25]. However, the SEM observation did not find any cavities because the time may not be sufficient for the formation of cavities occurring at grain boundaries, as the creep failure, caused damage in the pine steel worked at elevated temperatures for a long time.…”

Section: Resultssupporting

confidence: 90%

Decreasing Mechanical Properties of the Superheater Steel Grade P22 Heated at Elevated Temperature Under Constant Stress

Bui

Nguyen

2022

Acta Metall Slovaca

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This paper investigated change of the mechanical properties of the superheater pipe steel grade P22 (ASTM A335) under constant stress of 9.68 MPa and various temperatures of 500-700 oC. The steel specimens were prepared from the new steel pipe taken from a coal-fired power plant in Vietnam, then heated to the given temperature and held for the predetermined time as 24, 48 and 72 hours in the atmosphere. The results showed that the mechanical properties of the steel P22 decreased with the increased temperature and time. This deterioration of the steel strength was caused by the redistribution of the carbide in the steel subjected under the elevated temperature and the constant stress. Although change in the microstructure including phase and grain size was not observed, the SEM micrographs showed that the carbide of the heated steel accumulated on the grain boundaries and the triple regions when the temperature and holding time increased. This phenomenon was attributed to reduce number of the carbide in the steel, resulting in decrease of the mechanical properties. The obtained results indicated that decrease of the mechanical properties of the steel pipe P22 can occur in the early period of working time in the practice.

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Section: Resultssupporting

confidence: 90%

Decreasing Mechanical Properties of the Superheater Steel Grade P22 Heated at Elevated Temperature Under Constant Stress

Bui

Nguyen

2022

Acta Metall Slovaca

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“…(a) low-alloy 2.25%Cr1.6%W steel (T23) was received in the form of a pipe with the following heat treatment: 1045°C/10 min/air + 770°C/60 min/air [4],…”

Section: Steelsmentioning

confidence: 99%

“…In this work, earlier published creep data by the authors from previous studies on the creep behaviour and fracture of a low-alloy 2.25%Cr1.6%W steel (T23) [4], tempered martensitic 9%Cr1% Mo steel (P91) [5] and the W -modified 9%Cr steel (P92) [6] will be analysed in terms of creep damage factor λ to asses the creep fracture mode(s).…”

Section: Introductionmentioning

confidence: 99%

Creep Damage Tolerance Factor λ of Selected Creep-Resistant Steels

Sklenička

Kuchařová

Dvořák

et al. 2017

KEM

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The creep damage tolerance factor λ as an important outcome of the continuum damage mechanics approach has been used to asses the creep fracture mode and the susceptibility of material to localized cracking at strain concentrations. In this work, using sets of our earlier published creep data of three advanced ferritic creep-resistant steels (T23 low alloy steel, P91 and P92 chromium steels) are analysed in terms of the creep damage tolerance factor λ. It was found that the value of the creep damage factor λ is not constant and depends on the creep loading conditions. The data analysis is followed by fractographic investigations, which is used to identify the creep fracture mode (s) experimentally.

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“…Thomson [8] reported that M 6 C changes at a slower rate in a mixed microstructure of bainite and ferrite than that in a full bainite microstructure. Kucharova [9] reported that the coarsening of precipitates and the change in morphologies were the main causes of the degradation of creep strength when exposed to service temperatures. Generally, Fe-2Cr-Mo-0.12C (wt pct) bainite steel is used under normalized and tempered conditions.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Fe-2Cr-Mo-0.12C (Wt Pct)-Tempered Steel Plate at Different Normalizing Temperature After Hot Rolling

Wang

et al. 2020

Metall Mater Trans A

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The microstructure and properties of a Fe-2Cr-Mo-0.12C (wt pct)-tempered steel plate at different normalization temperatures after hot rolling were investigated to enhance its comprehensive mechanical properties. The microstructure of the steel was mainly composed of a ferrite-bainite-tempered martensite mixture after the normalization-tempering process. The tensile properties and the ductile-brittle transition temperature values indicated that the best comprehensive mechanical properties can be obtained by normalizing at 930°C and tempering at 700°C. When the normalization temperature was 880°C to 930°C, the yield strength increased as the bainite and tempered martensite hard phase volume fractions increased. However, when the normalization temperature surpassed 980°C, the precipitation strength behavior compensated for the adverse influence of the effective grain size growth, and yield strength was nearly unchanged. Total elongation reached a peak value when normalized at 930°C , due to the optimal volume fraction ratio of the soft to hard phase. The Charpy impact fracture changed from a ductile to a brittle fracture with an increase in the normalization temperature. When the normalization temperature was 930°C, the existence of a certain volume fraction of nano-precipitates and soft ferrite in the microstructure contributed to excellent ductile properties.

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Creep and microstructural processes in a low-alloy 2.25%Cr1.6%W steel (ASTM Grade 23)

Cited by 16 publications

References 19 publications

Decreasing Mechanical Properties of the Superheater Steel Grade P22 Heated at Elevated Temperature Under Constant Stress

Decreasing Mechanical Properties of the Superheater Steel Grade P22 Heated at Elevated Temperature Under Constant Stress

Creep Damage Tolerance Factor λ of Selected Creep-Resistant Steels

Microstructure and Properties of Fe-2Cr-Mo-0.12C (Wt Pct)-Tempered Steel Plate at Different Normalizing Temperature After Hot Rolling

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