Assessment of thermal fatigue life for 316L and P91 pipe components at elevated temperatures

Karl-Fredrik, Nilsson; Dolci, Franceso; Thomas, Seldis; Ripplinger, Stefan; Grah, Aleksander; Simonovski, Igor

doi:10.1016/j.engfracmech.2016.09.006

Cited by 23 publications

(6 citation statements)

References 33 publications

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“…If hoop stress is the principal stress then an axial crack can form. 3 Although axial cracking is a considerable problem in pipe networks, the detection of small axial cracks is still a significant non-destructive evaluation (NDE) challenge. Traditionally, it has often been performed using manual bulk wave ultrasonic NDE methods such as time-of-flight diffraction (TOFD) from the exterior of the pipe.…”

Section: Introductionmentioning

confidence: 99%

The use of circumferential guided waves to monitor axial cracks in pipes

Rodgers

Mariani

Cawley

2022

Structural Health Monitoring

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Guided wave testing is in routine use to detect corrosion, particularly in the oil and gas sector, but the detection of axial cracking is difficult using the axially propagating waves commonly used for corrosion detection. This paper presents a novel guided wave monitoring technique for the detection of axial cracking in piping. Circumferential SH0 waves, travelling around the circumference were used in a monitoring configuration to detect axial defects in a 6 inch schedule 80 steel pipe. Finite Element (FE) analysis showed that both the defect reflection and the decline in the transmitted SH0 wave can be used for defect detection. Baseline subtraction was utilised to produce residual signals that can be better analysed for small defect reflections. The Root-Mean-Square (RMS) of the residual signal after baseline subtraction was found to be the most satisfactory means of monitoring defect progression. An amplification effect was identified where the residual signal is compounded by continued interaction with the defect on each revolution of the incident wave. The FE predictions were validated by an experiment in which an Electrical Discharge Machining (EDM) notch was grown in four stages. Temperature compensation using Location Specific Temperature Compensation (LSTC) was applied to the experimental data, allowing residuals to be compared for a ∼10 °C temperature swing over a monitoring period of over 2 months. It was determined that a 10 mm long (∼23% of wavelength), 5 mm deep (∼45% of the wall thickness) defect at an axial offset from the line of the transducers of 1.5 wavelengths (65 mm) would be readily detectable with a very high Probability of Detection (POD) and virtually no chance of a false call. Therefore, this novel guided wave monitoring system for axial crack detection is likely to be attractive for applications in a range of industries for its sensitivity to axial cracking combined with large coverage from a single transducer location.

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Section: Introductionmentioning

confidence: 99%

The use of circumferential guided waves to monitor axial cracks in pipes

Rodgers

Mariani

Cawley

2022

Structural Health Monitoring

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“…The most severe loading conditions are those where stress or strain and temperature vary simultaneously, that is, in the case of thermomechanical fatigue. Numbers of thermomechanical studies were devoted to superalloy single and polycrystals 5–13 and to austenitic, low alloyed ferritic and dual hardening steels 14–28 …”

Section: Introductionmentioning

confidence: 99%

“…Numbers of thermomechanical studies were devoted to superalloy single and polycrystals [5][6][7][8][9][10][11][12][13] and to austenitic, low alloyed ferritic and dual hardening steels. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] From the newly developed austenitic steels, the highest interest was devoted to advanced austenitic stainless steels such as NF709, H3RC and Sanicro 25. Originally, the creep resistance was investigated.…”

Section: Introductionmentioning

confidence: 99%

The effect of dwell on thermomechanical fatigue in superaustenitic steel Sanicro 25

Petráš

Šulák

Polák

2020

Fatigue Fract Eng Mat Struct

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Superaustenitic steel Sanicro 25 has been subjected to out‐of‐phase thermomechanical fatigue cycles with 10‐min dwell at peak temperature in the temperature range from 250°C to 700°C. The effect of the dwells on the cyclic response, internal structure and damage mechanism was studied. Cyclic hardening/softening curves, cyclic stress–strain curves and fatigue life curves were evaluated. The internal structure and nanoparticles representing the obstacles for dislocation motion were analysed and identified by energy dispersive X‐ray spectroscopy in scanning transmission electron microscope. Scanning electron microscopy combined with focused ion beam and electron backscatter diffraction was adopted to reveal the respective mechanisms responsible for fatigue crack nucleation and propagation. Effect of dwells in in‐phase and in out‐of‐phase cycling on the fatigue behaviour, on the modification of internal structure and damage mechanisms, were analysed and discussed.

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“…В процессе термоциклирования наличие температурных градиентов приводит к термическим напряжени-ям. Анализ теплопроводности для прогнозирования термомеханической усталости, теплового сопротивления, оценки срока службы трубных элементов, работающих в условиях тепловой усталости, был представлен в модельной оценке в работах [10][11][12]. Авторы работы [13] показа-ли, что теплопроводность структурных составляющих в процессе термообработки ограничи-вает размеры фаз, что затрудняет получение желаемой микроструктуры.…”

Section: Introductionunclassified