Assessment of Service Life of HCM12 Steel After 100 000 Hrs of Service

Zieliński, A.; Paszkowska, H.; Skupień, P.; Golański, G.

doi:10.1515/amm-2016-0173

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…350,000 h involves the need to replace certain components because of the end of their life and to modernise them. Certain critical components being replaced are often made of new-generation steel for the power generation industry [11][12][13][14][15][16][17][18][19][20]. At the same time, these units are expected to be operated in the control system and to comply with standards of the European directive on limitation of harmful emissions into the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Creep Characteristics of Engineering Materials

Dobrzański¹,

Zieliński²

2020

Creep Characteristics of Engineering Materials

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The assessment of suitability for further service of the basic material and circumferential welded joints of primary steam pipelines made of 14MoV6-3 steel was made based on the determined characteristics of their mechanical properties and structure. The tests were carried out on materials after service significantly exceeding the design time and 200,000 h. The mechanical properties with respect to the determined class of structure for the basic and welded joint material were compared to the determined class of damage in accordance with the Institute for Ferrous Metallurgy's own classification of the condition of materials after service under creep conditions. The residual life and disposable residual life were determined based on short-term creep tests and referred to the class of existing structure and the class of damage. The assessment of the suitability of the basic and circumferential welded joint material for further service was made.

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Section: Introductionmentioning

confidence: 99%

Creep Characteristics of Engineering Materials

Dobrzański¹,

Zieliński²

2020

Creep Characteristics of Engineering Materials

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“…High-temperature creep resistant materials presently used in the power engineering sector have to be characterised by the stable microstructure and properties ensuring the safe operation of power units for a minimum of 200 000 hours. The initial assessment of the suitability of a given alloy grade is performed under laboratory conditions, whereas its actual verification is carried out in industrial conditions [1][2][3]. Metallurgical tests involving sections sampled from power generation systems aim to assess the effect of operating parameters on the exhaustion of the microstructure and the reduced ability of the material to transfer actual service loads.…”

Section: Introductionmentioning

confidence: 99%

The Analysis of the Microstructure of Welded Joints in Steel P5 after Service

Merda¹,

Golański²,

Wieczorek³

et al. 2020

eBIS

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The material subjected to the tests discussed in the article was a section of a welded joint made of bainitic steel P5. The joint subjected to analysis was sampled from a pipe section exposed to the effect of elevated temperature for more than 96 000 hours. The metallurgical tests revealed a relatively low degree of the degradation of the test joint. The microstructure contained retained bainite and precipitates of various morphology. The identification of precipitates revealed the presence of M23C6 and M2C precipitates in the joint. The M23C6 carbides were observed along the boundaries of former austenite grains. The above-named identification of precipitates also revealed the presence of M2C and M23C6 C6 carbides within the grains/laths. The insignificant exhaustion of the joint microstructure might be ascribed to the fact that the joint was subjected to relatively low temperature for a relatively short time.

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Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water

Sun

Yan

2021

High Temperature Materials and Processes

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More attention has been paid to the exfoliation of oxide scale on high-temperature heating surface of utility boiler. The oxidation mechanism of HCM12A steel in supercritical water is proposed and the growth of oxide film is simulated. The duplex scale contains an outer magnetite layer and an inner Cr-rich spinel layer. According to the data of Backhaus and Töpfer, the diffusion coefficient values of iron in magnetite layer are discussed and the function of R V, R I {R}_{\text{I}} for oxygen activity can be used for calculation of iron diffusion coefficients in Cr-rich spinel layer. Based on Wagner’s oxidation theory, the oxidation rate constants of HCM12A are calculated at 500 and 600°C in supercritical water, compared with experimental data of the relevant literatures. The oxygen activities at the interfaces of alloy/Cr-rich spinel oxide and magnetite/supercritical water are estimated. The simulation results of weight gain are matched with the test data. The iron diffusion mechanisms inside the magnetite layer and the Cr-rich spinel layer are analyzed. The iron diffusion coefficient at the interface of Cr-rich spinel/magnetite is discontinuous, while the oxygen activity is continuous in the whole double layer. The thickness of oxide scale on inner tube walls of the final superheater coils (T91) of a 600 MW supercritical boiler is calculated by using the calculation method provided by the paper. The modeling results, the measured data, and the calculation results by the method are compared. Accurate calculation of the thickness of the inner and outer oxide scales can provide a necessary basis for predicting the stress and exfoliation of oxide scales.

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Assessment of Service Life of HCM12 Steel After 100 000 Hrs of Service

Cited by 4 publications

References 20 publications

Creep Characteristics of Engineering Materials

Creep Characteristics of Engineering Materials

The Analysis of the Microstructure of Welded Joints in Steel P5 after Service

Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water

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