Damage mechanism in austenitic steel during high temperature cyclic loading with dwells

Petráš, Roman; Polák, Jaroslav

doi:10.1016/j.ijfatigue.2018.02.017

Cited by 31 publications

(19 citation statements)

References 19 publications

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“…Considerably lower fatigue life was found in in‐phase thermomechanical cycling (IP‐TMF) when maximum temperature coincides with maximum tensile stress than in out‐of‐phase cycling (OP‐TMF) when maximum temperature coincides with maximum compression stress 18 . The study of the introduction of dwell periods during isothermal cycling in maximum tension and maximum compression (IFD) revealed the effect of the creep damage 45 . Dwell periods contribute to the formation and linkage of cavities on the grain boundaries and the formation of internal cracks.…”

Section: Introductionmentioning

confidence: 99%

“…18 The study of the introduction of dwell periods during isothermal cycling in maximum tension and maximum compression (IFD) revealed the effect of the creep damage. 45 Dwell periods contribute to the formation and linkage of cavities on the grain boundaries and the formation of internal cracks. Internal cracks lead to the decrease of the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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

Self Cite

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“…Transmission electron microscopy (TEM) was used to study the dislocation arrangement 10 , the sources of its extraordinary cyclic hardening 11 and damage mechanisms at room and at elevated temperatures [12][13][14][15][16][17][18][19] . Further study was devoted to the damage mechanisms in thermomechanical fatigue [20][21][22][23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

“…Previous papers on thermomechanical fatigue were devoted to in-phase and to out-of-phase cycling between temperature 200°C and 700°C with constant strain rates (IP-TMF and OP-TMF) 20 and to in-phase cycling with dwell time in maximum tension (IPD-TMF) 22,25 . In this contribution the effect of the dwell period in a cycle applied in maximum compression (OPD-TMF) is studied.…”

Section: Introductionmentioning

confidence: 99%

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

Petráš

Šulák

Polák

2020

Preprint

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Superaustenitic steel Sanicro 25 has been subjected to in-phase and out-of-phase thermomechanical fatigue cycles in the temperature range from 250°C to 700°C. Both constant strain rate cycling and cycling with 10 minutes dwell at peak temperature were applied. 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 transmission electron microscopy was used to find modifications of the internal structure and precipitation of the nanoparticles. 10 min dwell at maximum temperature modified substantially the dislocation arrangement. Various nanoparticles representing the obstacles for dislocation motion were analysed and identified by energy dispersive X-ray spectroscopy in scanning transmission electron microscope. The damage mechanism operating under specific loading conditions was investigated on the surface as well as in the interior of the cycled specimens. Scanning electron microscopy combined with focused ion beam and electron backscatter diffraction was adopted to reveal the respective mechanisms responsible for crack nucleation and propagation. Effect of dwells on fatigue behaviour, modification of internal structure and damage mechanisms are analysed and discussed.

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“…However, the creep, fatigue, corrosion resistance, and oxide resistance cause susceptibility to degenerate even failure at high operating temperature. [ 6,7 ] Reliable and safe assessment of the life of austenitic heat‐resistant steel is crucial. The change in precipitation and possible mechanism of degradation at elevated temperature is significant to evaluate life of materials under service.…”

Section: Introductionmentioning

confidence: 99%

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

Wang

Wei

et al. 2020

steel research int.

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The austenitic heat‐resistant steels are significant materials used in boilers and nuclear reactors, owing to the excellent creep, fatigue, corrosion resistance, and mechanical properties. The precipitation and properties degenerate with the increasing temperature. It is necessary to clarify the main precipitation and properties under the service situation. Herein, the characteristic of main precipitation and the potential degraded mechanism of creep, fatigue, oxidation resistance, and corrosion resistance at high temperature are briefly reviewed. The main secondary phases under prolonged service environment include MX phase, M23C6 carbide, Z phase, Laves phase, and σ phase. Precipitation scattered uniformly is conductive to strength properties of steel and vice versa. Coarsening precipitation and the decrease of dislocation density are critical reason for the deteriorated mechanical properties at high temperature. The protective oxide films destroyed after exposure to boiler gas lead to failure of materials.

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Damage mechanism in austenitic steel during high temperature cyclic loading with dwells

Cited by 31 publications

References 19 publications

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

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

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

Precipitation and Properties at Elevated Temperature in Austenitic Heat‐Resistant Steels—A Review

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