Effect of hold time on high temperature creep-fatigue behavior of Fe–25Ni–20Cr (wt.%) austenitic stainless steel (Alloy 709)

Alsmadi, Zeinab Y.; Alomari, Abdullah S.; Kumar, N.; Murty, K. Linga

doi:10.1016/j.msea.2019.138591

Cited by 37 publications

(10 citation statements)

References 14 publications

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“…Application of this approach can also support the evaluation of decreasing creep-fatigue life with increasing creep dwell times in advanced austenitic stainless steels, e.g. as reported for Alloy 709 in [32].…”

Section: Predictive Capabilities and Limitations Of The Multi-scale Scmmentioning

confidence: 76%

Creep-fatigue interactions in type 316H under typical high-temperature power plant operating conditions

Petkov

Chevalier

Dean

et al. 2021

International Journal of Pressure Vessels and Piping

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Section: Predictive Capabilities and Limitations Of The Multi-scale Scmmentioning

confidence: 76%

Creep-fatigue interactions in type 316H under typical high-temperature power plant operating conditions

Petkov

Chevalier

Dean

et al. 2021

International Journal of Pressure Vessels and Piping

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“…Ueno et al [ 53 ] and He et al [ 54 ] indicated that cavities nucleate at grain boundary where precipitation appears and reduces the creep–fatigue life. Alsmadi et al [ 55 ] proposed that crack cavities along grain boundary and transgranular fatigue cracks accelerate the crack growth rate and decrease the time of crack initiation. Zhou et al [ 56 ] investigated that dislocation pills up in planer slip bands zone and leads to form stress concentration adjacent to grain boundary and cavities at grain boundary.…”

Section: Properties At Elevated Temperaturesmentioning

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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“…If the hold time is long enough, a steady-state regime appears after the primary creep region. Analyses of stress relaxation during hold time of a strain-controlled creep–fatigue test contain a fitting of relaxation functions that might be a source of error propagation, depending on the quality of fitting parameters [ 4 , 5 , 8 , 9 , 10 ]. Creep deformation during the hold time in stress-controlled creep–fatigue tests is straightforward to analyze and more accurate.…”

Section: Introductionmentioning

confidence: 99%

“…However, understanding micromechanisms governing high-temperature creep–fatigue behavior of this alloy is not well-established. Few authors have carried out creep–fatigue tests in order to understand the response of Alloy 709 at elevated temperatures [ 10 , 14 , 17 , 18 , 19 ]. Alsmadi et al [ 10 , 14 , 19 ] have performed high-temperature creep–fatigue tests in strain-controlled mode under different experimental conditions to study the effect of tensile hold time (0, 60, 600, 1800, and 3600 s), temperature (650 and 750 °C), and strain range (0.6–1.2%) on the creep–fatigue life of Alloy 709.…”

Section: Introductionmentioning

confidence: 99%

Stress-Controlled Creep–Fatigue of an Advanced Austenitic Stainless Steel at Elevated Temperatures

et al. 2022

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Creep–fatigue interaction occurs in many structural components of high-temperature systems operating under cyclic and steady-state service conditions, such as in nuclear power plants, aerospace, naval, and other industrial applications. Thus, understanding micromechanisms governing high-temperature creep–fatigue behavior is essential for safety and design considerations. In this work, stress-controlled creep–fatigue tests of advanced austenitic stainless steel (Alloy 709) were performed at a 400 MPa stress range and 750 °C with tensile hold times of 0, 60, 600, 1800, and 3600 s, followed by microstructural examinations. The creep–fatigue lifetime of the Alloy 709 was found to decrease with increasing hold time until reaching a saturation level where the number of cycles to failure did not exhibit a significant decrease. Softening behavior was observed at the beginning of the test, possibly due to the recovery of entangled dislocations and de-twining. In addition, hysteresis loops showed ratcheting behavior, although the mean stress was zero during creep–fatigue cycling, which was attributed to activity of partial dislocations. Microstructural examination of the fracture surfaces showed that fatigue failure dominated at small hold times where the cracks initiated at the surface of the sample. Larger creep cracks were found for longer hold times with a lower probability of dimpled cavities, indicating the dominance of creep deformation. The results were compared with other commonly used stainless steels, and plausible reasons for the observed responses were described.

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Effect of hold time on high temperature creep-fatigue behavior of Fe–25Ni–20Cr (wt.%) austenitic stainless steel (Alloy 709)

Cited by 37 publications

References 14 publications

Creep-fatigue interactions in type 316H under typical high-temperature power plant operating conditions

Creep-fatigue interactions in type 316H under typical high-temperature power plant operating conditions

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

Stress-Controlled Creep–Fatigue of an Advanced Austenitic Stainless Steel at Elevated Temperatures

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