Effect of the defect initial shape on the fatigue lifetime of a continuous casting machine roll

Yasniy, Oleh; Lapusta, Yuri

doi:10.1016/j.crme.2016.04.002

Comptes Rendus. Mécanique

2016

DOI: 10.1016/j.crme.2016.04.002

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Effect of the defect initial shape on the fatigue lifetime of a continuous casting machine roll

Oleh Yasniy

Yuri Lapusta

Abstract: The article deals with the influence of the defect initial shape on the residual lifetime of a continuous casting machine roll made of 25Cr1MoV steel. Based on this approach, previously proposed by some authors, the growth of the surface fatigue crack was modeled in a roll under loading and temperature conditions that are close to operational ones, taking into account the statistical distribution of the C parameter of Paris' equation. Dependencies of the continuous casting machines roll fatigue lifetime on the… Show more

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Cited by 2 publications

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References 41 publications

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“…The impact of initial shape of a defect on the residual lifetime of continuous casting machines roll made of steel 25Cr1MoV has been discussed in the paper [8]. The surface fatigue crack growth has been simulated in the roll under loading and temperature conditions close to the operational ones taking into account the statistical scatter of parameter C of Paris equation.…”

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confidence: 99%

Prediction of SMA residual lifetime taking into account mechanical properties under constant amplitude loading

Ясній¹,

Dyvdyk²,

Iasnii³

et al. 2020

Visnyk TNTU

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Shape memory alloys are widely used in medicine, bioengineering, aerospace, mechanical, civil engineering and other areas. Though they haven't been used for a long period of time, nevertheless, there are already known cases of SMA failure in structural elements. Therefore, there arises the question: how long can such structural elements be under operation. To answer this question, it is necessary to predict the residual lifetime of such alloys. The development of science and technology demands new increased requirements for the safety of such important structural elements, and, in particular, to the used devices. Fatigue crack growth (FCG) diagrams are generally significantly scattered, that can be taken into account, for instance, by building the distribution of parameters, which are involved in the equation describing the FCG diagram. Therefore, it is necessary to be able to predict FCG taking into account the scatter of mechanical properties, preliminary determined statistical distribution of crack growth resistance parameters, particularly, parameters of C and n of Paris equation. It is known, that the parameters of Paris equation are mutually dependent. Therefore, considering C as random variable, that changes from the specimen to specimen, it is possible to take into account the existing data scatter. The defects, which are found in the structural elements, have frequently the form of semi-elliptical cracks. FCG rate of pseudo-ellastic NiTi alloy was studied experimentally under uniaxial tension of cyllindrical specimens with a dimater of 8 mm at room temperature on air at servo-hydraulic testing machine STM-100. A methodology for predicting the residual lifetime of SMA cylindrical specimens with a semi-elliptical surface crack is proposed. The methodology is based on solving the system of differential equations describing crack propagation, load parameters and cyclic crack grow resistance, taking into account their statistical scatter and change of crack front shape. There were plotted the cumulative distribution functions of lifetime of specimens with a diameter of 2r for different initial crack depth (b/r = 0.25; 0.36; 0.5; 0.75) and the crack shape factor.

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mentioning

confidence: 99%

Prediction of SMA residual lifetime taking into account mechanical properties under constant amplitude loading

Ясній¹,

Dyvdyk²,

Iasnii³

et al. 2020

Visnyk TNTU

View full text Add to dashboard Cite

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Research on microstructure and properties of 3D plasma spray welding repair layer of continuous casting segmented rollers

Li,

Zhou,

Meng

et al. 2023

Mater. Res. Express

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In this paper, the Fe-Cr-Ni-Si powder was used in a 3D plasma spray welding machine to perform spray welding repair tests on continuous casting segmented rollers for service life improvement. The phase composition, hardness distribution, abrasion resistance and thermal stability of the spray welding layer were analyzed. Results indicated that the spray welding layer produced by 160 A welding current was more uniform and was with finer organization. The main phase zone was a single γ-Fe and the fusion zone was metallurgically combined with the base metal in a planar crystal manner. The hardness of the spray welding layer was the maximum when the welding current was 160 A. The abrasion resistance for each position of the spray welding layer was uniform. The γ-Fe phase zone decreased and the α-Fe phase zone increased with reduction of average hardness after the thermal stability test. In industrial tests, the optimum spray welding parameters were verified and the service life of the continuous casting segmented rollers with spray welding was 2 longer than rollers using surfacing welding process.

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Effect of the defect initial shape on the fatigue lifetime of a continuous casting machine roll

Cited by 2 publications

References 41 publications

Prediction of SMA residual lifetime taking into account mechanical properties under constant amplitude loading

Prediction of SMA residual lifetime taking into account mechanical properties under constant amplitude loading

Research on microstructure and properties of 3D plasma spray welding repair layer of continuous casting segmented rollers

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