The evaluation of suitability for operation of repair low-alloy steel welded joints

Dziuba-Kałuża, M.; Zieliński, A.; Jasiński, A.; Sroka, M.; Dobrzański, J.; Linek, Tomasz

doi:10.5604/18972764.1226992

Cited by 5 publications

(6 citation statements)

References 1 publication

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“…As a result of the process, their shapes and dimensions change constantly during service. After the elapse of sufficient time of working under creep conditions, the components are degraded and their further service is prevented [3][4][5]. The degradation processes start at the moment when the rate of strain changes from its minimum and proportional values to disproportional ones as it is increasing [6].…”

Section: Introductionmentioning

confidence: 99%

Introductory Chapter: Creep - An Overview of New Research Results

Zieliński¹,

Sroka²,

Tański³

et al. 2020

Creep Characteristics of Engineering Materials

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Section: Introductionmentioning

confidence: 99%

Introductory Chapter: Creep - An Overview of New Research Results

Zieliński¹,

Sroka²,

Tański³

et al. 2020

Creep Characteristics of Engineering Materials

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“…Out of them, the components working at above the limit temperature, that is, under creep conditions, are of particular importance. In the assessment of these components, it is important and necessary to assess the condition of their materials [1][2][3][4][5][6][7]. Such an assessment is carried out based on nondestructive materials testing, and its result is referred to the available characteristics of materials after service [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Procedure for Determining the Time of Safe Service beyond the Design Service Time Based on Creep Testing

Dobrzański¹

2020

Creep Characteristics of Engineering Materials

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This article describes the method for determination of residual life and disposable residual life based on long-and short-term creep tests for different temperature levels above the operating one and stress level equal to the operating one. The method for determination of the share of disposable life in total life and the time of safe service beyond the design service time was proposed. These characteristics of the steel are used for the evaluation of the structural changes and mechanical properties of the material after long-term operation. The result of this study is the database of material characteristics representing the mechanical properties related to the structure analysis, and it can be used for diagnosis of the components of pressure part of power boilers.

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“…At present, heat-resistant steels for the high-steam parameter of 650°C are being developed. This has put heat-resistant steels such as T/P91, T/P92 and E211 out of consideration because of the loss of the microstructure stability during service at the high temperature [5][6][7]. More advanced steels should be developed to meet this requirement.…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of the bainite transformation mechanism and the effect of normalizing and tempering on the hardness and microstructure of the new Cr-Mo-V-Ti steel for operation at elevated temperature

Ławrynowicz

2018

MATEC Web Conf.

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The Cr-Mo-V-Ti based low alloy steels are widely used in thermal power plants because of their ability to withstand elevated temperatures and high pressure under continuous service. In the present work conventional heat treatment like normalizing and tempering of the alloys has been performed. The material used in this study was the laboratory prepared experimental low alloy Cr-Mo-V-Ti steel. Samples were austenitized at 980oC for 0.5 hour air cooled and tempered at 500, 550, 600, 650, 700 and 750oC for 1 hour. Mechanism of bainite transformation has been studied in Fe-C-Cr-Mo-V-Ti steel using high speed dilatometry. These experimental data indicate that bainitic ferrite forms by a displacive transformation mechanism, but soon afterwards, excess of carbon is partitioned into the residual austenite. The changes observed in the microstructure of the steel tempered at the higher temperature, i.e. 750°C were more advanced than those observed at the temperature of 500°C. Performed microstructural investigations have shown that the degradation of the microstructure of the examined steel was mostly connected with the processes of recovery and polygonization of the matrix, disappearance of lath bainitic microstructure and the growth of the carbides. The magnitude of these changes depended on the temperature of tempering.

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The evaluation of suitability for operation of repair low-alloy steel welded joints

Cited by 5 publications

References 1 publication

Introductory Chapter: Creep - An Overview of New Research Results

Introductory Chapter: Creep - An Overview of New Research Results

The Procedure for Determining the Time of Safe Service beyond the Design Service Time Based on Creep Testing

Diagnostics of the bainite transformation mechanism and the effect of normalizing and tempering on the hardness and microstructure of the new Cr-Mo-V-Ti steel for operation at elevated temperature

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