Creep-fatigue interaction behavior of high temperature alloys: A review

Jadon, Jitender Kumar Singh; Singh, RP; Mahato, Jayanta Kumar

doi:10.1016/j.matpr.2022.03.487

Cited by 7 publications

(3 citation statements)

References 30 publications

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“…In addition, long steady-state operation periods at higher temperatures and stresses can lead to creep damage [ 1 ]. The combined effects of creep and fatigue damages result in reduced lifetimes due to the damage caused by reversed loading at high temperatures, combining effects of both fatigue and creep [ 4 ]. Creep–fatigue interaction should be considered in the design because both fatigue and creep exhibit different microstructural mechanisms; thus, extensive studies have been conducted to investigate the effect of combined creep–fatigue loading conditions [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Creep–fatigue interaction should be considered in the design because both fatigue and creep exhibit different microstructural mechanisms; thus, extensive studies have been conducted to investigate the effect of combined creep–fatigue loading conditions [ 5 , 6 , 7 ]. Most of the creep–fatigue studies focused on strain-controlled creep–fatigue mimicking operating conditions [ 4 , 5 , 8 , 9 ]. The lower- and upper-end fittings of the fuel bundle and many other parts of the reactor core are not allowed to strain freely; thus, the creep–fatigue responses under stress-controlled test conditions are closely related to potential damage to such parts instead of strain-controlled conditions.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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The High Temperature Strength of Single Crystal Ni‐base Superalloys – Re‐visiting Constant Strain Rate, Creep, and Thermomechanical Fatigue Testing

Sirrenberg,

Babinský,

Bürger

et al. 2024

Adv Eng Mater

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The present work takes a new look at the high temperature strength of single crystal (SX) Ni‐base superalloys. It compares high temperature constant strain rate (CSR) testing, creep testing and out‐of‐phase thermomechanical fatigue (OP‐TMF) testing, which represent key characterization methods supporting alloy development and component design in SX material science and technology. The three types of tests are compared using the same SX alloy, working with precisely oriented <001>‐specimens and considering the same temperature range between 1023 and 1223 K, where climb‐controlled micro‐creep processes need to be considered. Nevertheless, the three types of tests provide different types of information. CSR testing at imposed strain rates of 3.3·10‐4 s‐1 shows a yield stress anomaly (YSA) with a YSA stress peak at a temperature of 1073 K. This increase of strength with increasing temperature is not observed during constant load creep testing at much lower deformation rates around 10‐7 s‐1. Creep rates show a usual behavior and increase with increasing temperatures. During OP‐TMF loading, the temperature continuously increases/decreases in the compression/tension part of the mechanical strain‐controlled cycle (±0.5%). At the temperature, where the YSA peak stress temperature is observed, no peculiarities are observed. It is shown that OP‐TMF life is sensitive to surface quality, which is not the case in creep. A smaller number of cycles to failure is observed when reducing the heating rate in the compression/heating part of the mechanical strain‐controlled OP‐TMF cycle. The results are discussed on a microstructural basis, using results from scanning and transmission electron microscopy, and in light of previous work published in the literature.This article is protected by copyright. All rights reserved.

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Experimental investigation and life prediction for the load spectrum with flight mission characteristics on a P/M superalloy

JIANG,

YANG,

CHENG

et al. 2024

Chinese Journal of Aeronautics

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Creep-fatigue interaction behavior of high temperature alloys: A review

Cited by 7 publications

References 30 publications

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

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

The High Temperature Strength of Single Crystal Ni‐base Superalloys – Re‐visiting Constant Strain Rate, Creep, and Thermomechanical Fatigue Testing

Experimental investigation and life prediction for the load spectrum with flight mission characteristics on a P/M superalloy

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