Serrated flow accompanied with dynamic type transition of the Portevin–Le Chatelier effect in austenitic stainless steel

Lee, Seung-Yong; Chettri, Sita; Sarmah, Ritupan; Takushima, Chikako; Hamada, Junji; Nakada, Nobuo

doi:10.1016/j.jmst.2022.06.020

Cited by 7 publications

(11 citation statements)

References 33 publications

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“…The serrated behavior is another feature of the stress–strain curve at HT. As shown by the black circle, this instability is widely attributed to dynamic strain aging (DSA) 46 . In DSA, diffused solute atoms are temporarily pinned by barriers such as dislocation junctions, grain boundaries, and precipitates, that is, forming a Cottrell atmosphere pinning the mobile dislocations 47,48 .…”

Section: Resultsmentioning

confidence: 99%

“…Eventually, the dislocation is reactivated due to the depinning of the solute atoms. This series of processes repeated as the diffusion process continues 46 . At 600°C, due to the micro‐segregation of molybdenum and the entanglement of dislocation in the LPBF materials, 1,49 the dislocation organized as cells structure around the dendrite first, then interacts with molybdenum 1 .…”

Section: Resultsmentioning

confidence: 99%

“…As shown by the black circle, this instability is widely attributed to dynamic strain aging (DSA). 46 In DSA, diffused solute atoms are temporarily pinned by barriers such as dislocation junctions, grain boundaries, and precipitates, that is, forming a Cottrell atmosphere pinning the mobile dislocations. 47,48 Eventually, the dislocation is reactivated due to the depinning of the solute atoms.…”

Section: Experimental Methods and Microstructural Observationmentioning

confidence: 99%

“…This series of processes repeated as the diffusion process continues. 46 At 600 C, due to the microsegregation of molybdenum and the entanglement of dislocation in the LPBF materials, 1,49 the dislocation organized as cells structure around the dendrite first, then interacts with molybdenum. 1 Thus, the serrations begin only after a critical deformation rather than after the yield stress for the wrought alloy.…”

Section: Experimental Methods and Microstructural Observationmentioning

confidence: 99%

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The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

Liu,

Cai,

Wang

et al. 2023

Fatigue Fract Eng Mat Struct

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Symmetrical high‐temperature low‐cycle fatigue tests were performed in this study to examine the influence of temperature on the fatigue failure mechanism of the additively manufactured Inconel 625. According to the fracture analysis, cracks initiate from the crystallographic plane at room temperature. At 600°C, oxidation of carbides leads to crack initiation. The strengthening effect of γ″ precipitation prevents crack propagating within the matrix. At 750°C, the crack becomes transgranular propagating, as a consequence of γ″‐δ transformation. Geometrically necessary dislocations distribution on the fracture supports this result. Furthermore, a modified life prediction formula considering effect of temperature and strain amplitude was established. It was observed that the modified model predicted the fatigue life of the studied materials well in both test conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methods and Microstructural Observationmentioning

confidence: 99%

Section: Experimental Methods and Microstructural Observationmentioning

confidence: 99%

See 2 more Smart Citations

The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

Liu,

Cai,

Wang

et al. 2023

Fatigue Fract Eng Mat Struct

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“…Based on the serration shape, orientation, and spatio-temporal organization of the deformation bands in the sample, serrations can be categorized into three types: A, B, and C [27][28][29][30][31]. In [27][28][29][30][31], A-type serrations are characterized by a sudden increase followed by a drop slightly below the general load level of the stress-strain curve. This type occurs in the low-temperature or high-strain part of the DSA regime [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

On the Potential Correlation between Dynamic Strain Aging and Liquid Metal Embrittlement in T91/LBE System

Fitriani,

Claeys,

Gavrilov

et al. 2023

Metals

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In the study of the liquid metal embrittlement (LME) of the T91/lead-bismuth eutectic (LBE) system, it is observed that LME occurs in a temperature interval which is similar to the temperature range where dynamic strain aging (DSA) is observed. However, the potential correlation between DSA and LME has not yet been satisfactorily investigated. This investigation for the T91/LBE system is exactly the topic of this work. For the evaluation of DSA and LME, slow strain rate tensile tests are conducted in the temperature range between 200 °C and 450 °C with strain rates of 5×10−5 s−1 and 5×10−6 s−1 in reference and a molten oxygen-depleted LBE environment. The resulting tensile properties, as well as the fracture surfaces and lateral surfaces of the failed samples, suggest a correlation between DSA and LME in the T91/LBE system. The maximum mechanical degradation of T91 is observed in the case where the effects of both DSA and LME on material properties are found to be at maximum. However, the observation of DSA was not identified as a prerequisite for LME to take place. Therefore, these results may indicate that DSA partly contributes to the ductility minimum observed in the T91/LBE system. In addition, the results of this work show that changes in the fracture surface and lateral surface are more sensitive features to claim for the potential occurrence of LME than the changes in total elongation.

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Influence of surface pre-deformation on the Portevin-Le Chatelier effect and the related multiscale complexity of plastic flow in an Al-Mg alloy

Jaber,

Beausir,

Entemeyer

et al. 2024

Acta Materialia

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Serrated flow accompanied with dynamic type transition of the Portevin–Le Chatelier effect in austenitic stainless steel

Cited by 7 publications

References 33 publications

The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

On the Potential Correlation between Dynamic Strain Aging and Liquid Metal Embrittlement in T91/LBE System

Influence of surface pre-deformation on the Portevin-Le Chatelier effect and the related multiscale complexity of plastic flow in an Al-Mg alloy

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