Statistical analysis of the Portevin–Le Chatelier effect in Inconel 718 at high temperature

Maj, P.; Zdunek, Joanna; Giżyński, Maciej; Mizera, J.; Kurzydłowski, Krzysztof J.

doi:10.1016/j.msea.2014.09.075

Cited by 30 publications

(19 citation statements)

References 23 publications

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“…Literature studies have shown that the PLC effect occurs not only in copper, aluminum and nickel alloys [2][3][4]17,18], but also in some steel grades. Plastic instability phenomenon was observed in steels with increased Cr content [7,19], austenitic stainless steels [20], Hadfield steels [21] and dual phase (DP) steels [22].…”

Section: Introductionmentioning

confidence: 99%

“…Some of the AHSSs are also prone to plastic instability phenomenon, such as high-manganese Twinning-Induced Plasticity (TWIP) steels [8], medium-manganese steels [6,13] and Q&P steels [10]. Literature studies have shown that the PLC effect occurs not only in copper, aluminum and nickel alloys [2][3][4]17,18], but also in some steel grades. Plastic instability phenomenon was observed in steels with increased Cr content [7,19], austenitic stainless steels [20], Hadfield steels [21] and dual phase (DP) steels [22].…”

Section: Introductionmentioning

confidence: 99%

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Explanation of the PLC Effect in Advanced High-Strength Medium-Mn Steels. A Review

et al. 2019

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The paper reviews the recent works concerning the Portevin-Le Chatelier (PLC) effect in Advanced High-Strength Steels (AHSSs) with a special attention to high-strength medium-manganese steels. Theories explaining the mechanism of the plastic instability phenomenon in steels with medium-and high-Mn contents were discussed. The relationships between microstructural effects such as TRIP (Transformation-Induced Plasticity), TWIP (Twinning-Induced Plasticity) and the PLC effect were characterized. The effects of processing conditions including a deformation state (hot-rolled and cold-rolled) and strain parameters (deformation temperature, strain rate) were addressed. Factors affecting the value of critical strain for the activation of serrated flow behavior in particular in medium-manganese steels were described.The explanation of the Portevin-Le Chatelier mechanism in medium-Mn steels showing the TRIP effect is a complicated issue because of their microstructure consisting of several phases, as well as the TRIP effect exhibited by these steels. The exact characteristics of the factors affecting the PLC effect in AHSS is very important, both from a research point of view and their industrial implementation. This overview concerns the PLC phenomenon in Advanced High Strength Steels (AHSSs), with particular emphasis on advanced medium-Mn TRIP steels. The Nature of PLC Effect in SteelsThe plastic instability phenomenon occurring during the deformation of metallic materials shows two most common forms of propagative bands: Lüders and Portevin-Le Chatelier bands. The Lüders bands refer to the regions of localized strain. They form immediately after the onset of plastic deformation from the yield point drop, followed to a dominant stage of the stress plateau stage. Lüders bands are commonly caused by static strain aging (SSA) [13]. Static strain aging is characterized by an increase in strength properties associated with a decrease in plasticity. The PLC bands are represented by characteristic serrations on stress-strain curves. PLC bands are usually related to the dynamic strain aging (DSA) effect. The occurrence of the PLC bands is much more erratic, and can be observed in various forms (serration types) in comparison to the Lüders bands.There are several theories which explain the PLC effect in metallic materials. However, none has been so far clearly confirmed. The first interpretation of this phenomenon was proposed by Cottrell [1]. From his point of view, the PLC effect is related to the interactions between solute atoms, such as C or N, and mobile dislocations. The presence of serrations on a tensile curve is associated with the rapid release of dislocations from the atmospheres of dissolved atoms, which block their movement. This model is based on the assumption that atmospheres are formed around dislocations due to volume diffusion. In the presence of substitution atoms, diffusion is facilitated by vacancies resulting from plastic deformation. The interstitial gaps located in the vicinity of the dislocation are enl...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Explanation of the PLC Effect in Advanced High-Strength Medium-Mn Steels. A Review

et al. 2019

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“…The most accepted mechanism for the formation of the serrations is the dynamic strain aging (DSA) during the plastic deformation. This is a result of the interaction among solute atoms and mobile dislocations [8,21]. An acoustic emission can be heard in each stress drop which matches with the formation of a deformation band [17].…”

Section: Tensile Testsmentioning

confidence: 83%

“…The serrations do not occur randomly. From a detailed inspection, it can be possible to observe form identifiable patterns which, under specific conditions, show determined regularity [8]. At high strain rates and low temperatures, the A-type serrations occurs.…”

Section: Tensile Testsmentioning

confidence: 99%

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Mechanical Behavior of Inconel 625 at Elevated Temperatures

Oliveira

Couto

Almeida

et al. 2019

Metals

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Inconel 625 is a nickel-based alloy that is mainly used in high-temperature applications. Inconel 625 exhibits an unstable plastic flow at elevated temperatures characterized by serrated yielding, well-known as the Portevin-Le Chatelier effect. The evaluation of the mechanical properties of Inconel 625 at high temperatures is the aim of this work. The tensile tests were executed in temperatures ranging from room temperature to 1000 °C with strain rates of 2 × 10−4 to 2 × 10−3 s−1. The creep tests were executed in the temperature range of 600–700 °C and in the stress range of 500–600 MPa in a constant load mode. The optical and scanning electron microscopes were used for surface fracture observation. In the curves obtained at 200–700 °C the serrated stress-strain behavior was observed, which was related to the dynamic strain aging effect. The yield strength and the elongation values show anomalous behavior as a function of the test temperature. An intergranular cracking was observed for a specimen tensile tested at 500 °C that can be attributed to the decohesion of the carbides along the grain boundaries. The fracture surface of the specimen tensile tested at 700 °C showed the predominance of transgranular cracking with tear dimples with a parabolic shape.

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Improving the grindability of Inconel 718 by hydrogen embrittlement in ultrasonic-assisted grinding

Qiao

et al. 2021

Int J Adv Manuf Technol

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Statistical analysis of the Portevin–Le Chatelier effect in Inconel 718 at high temperature

Cited by 30 publications

References 23 publications

Explanation of the PLC Effect in Advanced High-Strength Medium-Mn Steels. A Review

Explanation of the PLC Effect in Advanced High-Strength Medium-Mn Steels. A Review

Mechanical Behavior of Inconel 625 at Elevated Temperatures

Improving the grindability of Inconel 718 by hydrogen embrittlement in ultrasonic-assisted grinding

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