Influence of the strain rate on the PLC effect and acoustic emission in single crystals of the CuZn30 alloy compressed at an elevated temperature

Ozgowicz, W.; Grzegorczyk, B.; Pawełek, A.

doi:10.17222/mit.2013.195

Cited by 3 publications

(4 citation statements)

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“…The deformation of these steels is related to the specific microstructural mechanisms, like transformation induced plasticity (TRIP) and Portevin-Le Chatelier (PLC) effects. The occurrence of the PLC effect was previously typically observed in Al and Cu alloys at room or elevated temperatures [29][30][31]. Concerning steels, the serrated behavior in flow stress was observed in dual-phase steels [42], quenching and partitioning steels [28], and recently in high manganese twinning induced plasticity (TWIP) steels containing 17-25 % Mn [18][19][20]23,27,43].…”

Section: Discussionmentioning

confidence: 73%

“…It seems that twinning should also have some impact, taking into account the stacking fault energy of the alloy and its resulting increased austenite stability. Experimental results obtained by other authors [20,27,28] confirmed that the chemical composition of steel (especially C and Mn contents), deformation temperature, and strain rate had an influence on the occurrence of the PLC effect and the mechanical stability of the retained austenite.So far, the PLC effect has been intensively studied in aluminium-and copper-based alloys [29][30][31]. Recently, this phenomenon was also largely studied in TWIP steels [18][19][20]22,23].…”

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confidence: 99%

“…So far, the PLC effect has been intensively studied in aluminium-and copper-based alloys [29][30][31]. Recently, this phenomenon was also largely studied in TWIP steels [18][19][20]22,23].…”

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confidence: 99%

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Effect of Deformation Temperature on the Portevin-Le Chatelier Effect in Medium-Mn Steel

Grzegorczyk

Kozłowska

Morawiec

et al. 2018

Metals

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Experimental investigations of the plastic instability phenomenon in a hot-rolled medium manganese steel were performed. The effects of tensile deformation in a temperature range of 20-140 • C on the microstructure, mechanical properties, and flow stress serrations were analyzed. The Portevin-Le Chatelier (PLC) phenomenon was observed for the specimens deformed at 60 • C, 100 • C, and 140 • C. It was found that the deformation temperature substantially affects the type and intensity of serrations. The type of serration was changed at different deformation temperatures. The phenomenon was not observed at room temperature. The plastic instability occurring for the steel deformed at 60 • C was detected for lower strain levels than for the specimens deformed at 100 • C and 140 • C. The increase of the deformation temperature to 100 • C and 140 • C results in shifting the PLC effect to a post uniform deformation range. The complex issues related to the interaction of work hardening, the transformation induced plasticity (TRIP) effect, and the PLC effect stimulated by the deformation temperature were addressed. stabilize the retained austenite through its carbon enrichment [8]. An alternative approach is to apply thermomechanical processing (TMP) as direct one-step cooling following the hot rolling. The TMP has the potential for energy savings and high productivity due to the elimination of the need for successive heating [9][10][11]. Chemical composition and processing parameters are designed to obtain the optimal TRIP (Transformation Induced Plasticity) effect, which ensures superior mechanical properties [12,13].Besides the many advantages of this group of steels, some problems during their processing can occur. Medium manganese steels [14-17] and high manganese steels [18][19][20] are prone to plastic instabilities phenomena associated with a serrated flow behavior-Portevin-Le Chatelier (PLC) effect and the appearance of Lüders bands. This is especially the case for cold-rolled steel sheets [21]. Moreover, it critically depends on the carbon level. With a higher C content, a pronounced effect is more visible. The heterogeneous deformation related to the increase in flow stress can lead to numerous cracks during the forming of sheets. Moreover, delayed cracking after deep drawing can appear. Delayed cracking is mostly observed in high-Mn content steels of the high austenite volume fraction. With the increased volume fraction of (retained) austenite, hydrogen embrittlement may be a more important concern. TWIP steels in the last decades have displayed important delayed cracking, which was industrially solved by decreasing the C content, Al alloying, and/or metallurgical processing [22,23]. Medium Mn steels have a less pronounced problem of delayed cracking compared to high-Mn steels [24,25].The PLC effect is commonly known as characteristic serrations which can be observed on a strain-stress curve during a tensile test. The PLC effect has not been fully characterized yet. However, some correlations between the TRIP a...

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Section: Discussionmentioning

confidence: 73%

mentioning

confidence: 99%

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Effect of Deformation Temperature on the Portevin-Le Chatelier Effect in Medium-Mn Steel

Grzegorczyk

Kozłowska

Morawiec

et al. 2018

Metals

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“…This effect of plastic instability is often determined as "jerky flow" or "serration" and in literature it is called Portevin -Le Chatelier effect (PLC) [4,5]. The characteristic oscillations of the stress on the work -hardening curve in the range of the plastic flow differ in their shape and size, depending mainly on the temperature and strain rate [6]. The PLC effect has been know for many years, although so far it has not been fully explained [7].…”

Section: Introductionmentioning

confidence: 99%

Relation between the plastic instability and fracture of tensile tested Cu-Sn alloys investigated with the application of acoustic emission technique

Ozgowicz¹,

Grzegorczyk²,

Pawełek³

et al. 2015

Frattura Ed Integrità Strutturale

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The work concerns the application of the acoustic emission (AE) method in testing the mechanical properties of continuously cast industrial tin bronze CuSn6P, which reveals tendencies to instable plastic flow connected particularly with the Portevin-Le Chatelier (PLC) effect. The relations between the jerky flow connected with the PLC effect, AE intensity and the evolution of a fracture of the investigated alloy subjected to the tensile test at a strain rate (  ) of about 1.2•10 -3 s -1 in the range of temperatures (20÷400C) has been analyzed. It has been found that the highest intensity of the oscillation of stresses, corresponding to the instability of plastic deformation PLC occurred at 200C, whereas the maximum of the AE activity is at about 200÷250C. The brittle intergranular fracture starts in the range of equicohersive temperature (TE) of about 200C. Plastic deformation of the investigated alloy in the range of the temperature of minimum plasticity, amounting to about 400C, results in intercrystalline fractures on the entire surface of the stretched samples.

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An analysis of the Portevin–Le Chatelier effect and cracking of CuSn6P alloy at elevated temperature of deformation applying the acoustic emission method

Ozgowicz

Grzegorczyk

Pawełek

et al. 2016

Engineering Fracture Mechanics

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Influence of the strain rate on the PLC effect and acoustic emission in single crystals of the CuZn30 alloy compressed at an elevated temperature

Cited by 3 publications

References 9 publications

Effect of Deformation Temperature on the Portevin-Le Chatelier Effect in Medium-Mn Steel

Effect of Deformation Temperature on the Portevin-Le Chatelier Effect in Medium-Mn Steel

Relation between the plastic instability and fracture of tensile tested Cu-Sn alloys investigated with the application of acoustic emission technique

An analysis of the Portevin–Le Chatelier effect and cracking of CuSn6P alloy at elevated temperature of deformation applying the acoustic emission method

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