Prediction of crack resistance for heat-resistant steels taking into account the specimen size effect. Communication 1. Results of experimental investigations

Troshchenko, V. T.; Покровский, В. В.; Kaplunenko, V. G.

doi:10.1007/bf02767570

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…The obtained results agree with numerous literature data [4], where it is indicated that the critical characteristics of crack resistance may increase, decrease, or even remain constant as the sizes of the specimen change. As shown in what follows, this depends on the specific mechanical properties of the material.…”

Section: T°c T°csupporting

confidence: 93%

“…8, we present the results of comparison of the characteristics of crack resistance obtained by using relations (4) and (5) for CT-1 and CT-0.5 specimens at different temperatures with the experimental data. The parameter J c is recalculated into K c by the formula …”

Section: Comparison Of the Experimental And Numerical Datamentioning

confidence: 99%

“…On the basis of the experimental data on the crack resistance of structural materials of different strength categories presented in [4], we propose a procedure capable of the prediction of fracture toughness on the upper shelf of the temperature dependence with regard for the influence of stressed state and check this procedure in what follows for the case of 12Cr-2Ni-Mo steel.…”

Section: Computational-experimental Model For the Prediction Of The Smentioning

confidence: 99%

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Prediction of the temperature dependence of fracture toughness of 12Cr–2Ni–Mo refractory steel

Покровский

Kulishov²,

Sidyachenko

et al. 2009

Strength Mater

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We study the influence of temperature and the size of the specimens on the characteristics of static crack resistance of 12Cr-2Ni-Mo refractory steel. It is shown that, in the temperature range 20-450°C, the increase in the thickness of specimens leads to an insignificant increase in fracture toughness obtained along a 5% secant line according to the standards of evaluation of the characteristics of crack resistance. The evaluation of the characteristics of crack resistance of 12Cr-2Ni-Mo steel with regard for the scale effect according to an earlier developed numericalexperimental model reveals the existence of satisfactory agreement with the experimental data in the entire investigated temperature range.Keywords: fracture toughness, refractory steel, stress intensity factor, scale effect.Statement of the Problem. Disks are among the most heavily loaded structural elements of gas-turbine plants (GTP). Their fracture is not localized in the body of the product and may lead to catastrophic failures. The cross-sectional sizes of the disk change in passing from the hub to the rim. Moreover, the rim part contains a large number of stress concentrators in the form of herringbone grooves, holes for air cooling, places for mounting balance weights, various sites of milling, etc., which play the role of the sources of crack initiation in the process of operation. To prevent sudden failures of the disks, it is proposed to use the concept of operation of GTP according to their current operating state. To make the proper choice of the amount and frequency of scheduled maintenance, it is necessary to perform the experimental investigation of the characteristics of crack resistance of the material of the disks for different loading modes with regard for the operating (temperature) conditions and structural features of the product (sizes and shape).The analysis of the available literature sources shows that the shape and sizes of the body may significantly affect the characteristics of crack resistance. This is why the prediction of the influence of the scale effect on the values of the static and cyclic fracture toughness and the justification of the possibility of application of the critical values of the characteristics of crack resistance obtained for laboratory specimens to the evaluation of the fracture toughness of actual structural elements (disks) are important and urgent problems of fracture mechanics.The aim of the present work is to perform the experimental investigation of the temperature dependence of the static fracture toughness of 12Cr-2Ni-Mo refractory disk steel in the operating temperature range 20-450°C for compact specimens 25 (CT-1) and 10 mm (CT-0.5) in thickness. In addition, on the basis of the results of this investigation, we check an earlier developed procedure [1] for the prediction of fracture toughness of large-scale specimens according to the results of testing of specimens with small cracks.Experimental Results and Their Analysis. The fracture toughness of compact specimens 25 and 10 mm in thi...

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Section: T°c T°csupporting

confidence: 93%

Section: Comparison Of the Experimental And Numerical Datamentioning

confidence: 99%

Section: Computational-experimental Model For the Prediction Of The Smentioning

confidence: 99%

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Prediction of the temperature dependence of fracture toughness of 12Cr–2Ni–Mo refractory steel

Покровский

Kulishov²,

Sidyachenko

et al. 2009

Strength Mater

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Relationship between rupture stress and microstructure parameters of plastically deformed heat-resistant steel

2007

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620.187.3 and I. B. OkipnyiThe paper addresses the influence of plastic prestraining in tension and combined tension at 150 and 350°C on the rupture stress in 15Kh2MFA steel upon heat treatment that simulates irradiation embrittlement of materials in a WWER-440 type reactor towards the end of its lifetime. The dependence of rupture stress on the dislocation density in the material upon plastic prestraining is studied. It is found out that as the plastic prestraining in tension and combined tension grows, the dislocation density within small-angle boundaries increases and thus results in a larger rupture stress. An increase in rupture stress in the case of prestraining at 350°C is more intensive than that at 150°C. We analyze the microcrack nucleation and growth micromechanisms in 15Kh2MFA steel during tensile plastic deformation and discuss the effect of the material substructure on the microcrack arrest.

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On Experimental Procedure Development for Evaluating the Effect of Biaxial Loading on the Static Crack Resistance Characteristics of Reactor Vessel Steels

2022

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Prediction of crack resistance for heat-resistant steels taking into account the specimen size effect. Communication 1. Results of experimental investigations

Cited by 5 publications

References 35 publications

Prediction of the temperature dependence of fracture toughness of 12Cr–2Ni–Mo refractory steel

Prediction of the temperature dependence of fracture toughness of 12Cr–2Ni–Mo refractory steel

Relationship between rupture stress and microstructure parameters of plastically deformed heat-resistant steel

On Experimental Procedure Development for Evaluating the Effect of Biaxial Loading on the Static Crack Resistance Characteristics of Reactor Vessel Steels

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