Dependence of dynamic strain ageing on strain amplitudes during the low-cycle fatigue of TP347H austenitic stainless steel at 550°C

Zhou, Hongwei; He, Yizhu; Cui, Mian; Cen, Yuwan; Jiang, Jianqing

doi:10.1016/j.ijfatigue.2013.07.010

Cited by 24 publications

(8 citation statements)

References 26 publications

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“…2, serrated flow occurred during LCF of the investigated CoCrFeMnNi HEA. This phenomenon has been widely reported for quasistatic deformation in various alloys [19,21,31,36,[54][55][56][57],…”

Section: Serrated Flowsupporting

confidence: 59%

“…In DSA, the competition between solute mobility and the dislocation velocity plays a crucial role [9,30]. DSA in steels has been attributed to the strong interactions between mobile planar dislocations and solute atoms, such as interstitial C or N atoms at lower temperatures (250 °C -450 °C), or substitutional Cr atoms at higher temperatures (450°C -650 °C) due to different activation energy [54,55].…”

Section: Serrated Flowmentioning

confidence: 99%

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High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy

Chauhan

Litvinov

et al. 2020

Materials Science and Engineering: A

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In the present work, low cycle fatigue (LCF) behavior of an equiatomic CoCrFeMnNi high entropy alloy (HEA) is correlated to the microstructural evolution at 550 °C. The fully reversed strain-controlled fatigue tests were conducted in air under strain amplitudes ranging from 0.2 to 0.8%. The measured cyclic stress response showed three distinct stages which include initial cyclic hardening followed by a quasi-stable cyclic response until failure. The rate and amount of cyclic hardening increased with the increase in strain amplitude. In comparison to common austenitic stainless steels, CoCrFeMnNi HEA shows comparable strength and improved LCF lifetimes at similar testing conditions. Electron-microscopy investigations after failure reveal no noticeable change in grain size, texture and annealing twins density. Initial cyclic hardening is attributed to dislocation multiplication and dislocation-dislocation as well as dislocationsolute atom interaction. The quasi-stable cyclic response is associated with the equilibrium between dislocation multiplication and annihilation, which also leads to the formation of heterogeneous dislocation structures such as ill-defined walls and cells, particularly at higher strain amplitudes. Besides this, the material exhibits serrated plastic-flow due to interactions between mobile dislocations and diffusing solute 2 atoms (such as Cr, Mn and Ni). Lastly, segregation in the form of Cr-and NiMn-enriched phases were observed near grain boundaries, which appears to have a detrimental effect on the fatigue life.

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Section: Serrated Flowsupporting

confidence: 59%

Section: Serrated Flowmentioning

confidence: 99%

High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy

Chauhan

Litvinov

et al. 2020

Materials Science and Engineering: A

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“…7(c) shows the triple junction grain boundary. The stress concentration can be relaxed by the process of DRX at the triple junction grain boundary [56]. It can be found that the dislocation densities in various grains are different.…”

Section: Microstructure Analysis Based On the Processing Mapmentioning

confidence: 99%

Hot deformation characteristics of Alloy 617B nickel-based superalloy: A study using processing map

Jiang

Dong

Zhang

et al. 2015

Journal of Alloys and Compounds

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“…The influence of high temperature on fatigue life of materials is complicated. The previous results of LCF at RT and 550 °C showed that DSA effect appeared at 550 °C, and significantly reduced fatigue life 25 . The DSA effect mainly manifests itself as serrated yielding in the stressstrain curves 22,25,26 .…”

Section: Fatigue Life and Cyclic Stressmentioning

confidence: 70%

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Fang

Wei

et al. 2022

Mat. Res.

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In this paper, the relationship between Kernel average misorientation (KAM), geometrically necessary dislocation (GND) density and dislocation structures of Nb-bearing austenitic stainless steel under low cycle fatigue (LCF) was studied at 600°C at the total strain amplitude ranged from 0.3% to 1.0%. The results based on EBSD analysis show that the GND density in fatigue specimens gradually increases with the increase of strain amplitude. Under LCF loading, the dislocation structures are mainly planar slip bands (PSBs) and the cell structures. With the increase of strain amplitude, the number of PSBs increases with decrease in width, and the average diameter of cells also decreases. The PSBs originate due to the dynamic strain aging (DSA) effect, and DSA is more significant under high strain amplitude. The average diameter of cell structures has a specific relationship with GND density.

show abstract

Dependence of dynamic strain ageing on strain amplitudes during the low-cycle fatigue of TP347H austenitic stainless steel at 550°C

Cited by 24 publications

References 26 publications

High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy

High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy

Hot deformation characteristics of Alloy 617B nickel-based superalloy: A study using processing map

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

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