Investigation using digital image correlation of Portevin-Le Chatelier Effect in Hastelloy X under thermo-mechanical loading

Swaminathan, Bharath; Abuzaid, Wael; Şehitoğlu, Hüseyin; Lambros, John

doi:10.1016/j.ijplas.2014.09.001

Cited by 38 publications

(12 citation statements)

References 35 publications

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“…Room temperature tensile tests were performed with a constant grip velocity corresponding to the initial a  taking on the values of 2.86×10 -5 s -1 , 1.43×10 -4 s -1 , 1×10 -3 s -1 , 5×10 -3 s -1 , and 1.43×10 -2 s -1 . DIC technique with a spatial resolution about 25 pixels/mm and image acquisition rate of 15 frames/s was used to visualize the PLC bands (Benallal et al, 2008;Swaminathan et al, 2015;Cai et al 2016;Yuzbekova et al, 2017). The 2D version of this technique reconstructs the evolution of the surface local strain field by correlation of successive images of a speckle pattern painted on the surface of the undeformed specimen.…”

Section: Materials and Mechanical Testingmentioning

confidence: 99%

Interrelation between the Portevin Le-Chatelier effect and necking in AlMg alloys

Zhemchuzhnikova

Lebyodkin

Yuzbekova

et al. 2018

International Journal of Plasticity

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Plastic flow instability caused by the Portevin Le-Chatelier (PLC) effect and its influence on the necking instability were studied in a binary and a precipitation-strengthened AlMg alloy using the digital image correlation (DIC) technique. Coarse-grained structure and two different fine-grained states distinctly distinguished by dislocation density were produced in both alloys using similar routes of thermomechanical processing. The patterns of stress serrations and strain localization observed at different strain rates include virtually all common types of behavior of the PLC effect. Besides, particular spatiotemporal patterns testifying to a concurrency between the propagation and localization of deformation bands are detected at low strain rates. Despite this diversity, the analysis of deformation curves with smoothened-out serrations bears evidence that the onset of necking always corresponds to the geometric Considère condition. Nevertheless, visualization of the evolution of the local strain-rate field using DIC indicates that the two mechanisms of plastic instability are closely interrelated and modify each other's behavior. The neck formation is associated with a progressive immobilization of the PLC bands, ending by the ultimate strain localization. The coexistence of two kinds of instability during necking gives rise to specific spatiotemporal patterns including oscillatory strain localization.

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Section: Materials and Mechanical Testingmentioning

confidence: 99%

Interrelation between the Portevin Le-Chatelier effect and necking in AlMg alloys

Zhemchuzhnikova

Lebyodkin

Yuzbekova

et al. 2018

International Journal of Plasticity

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“…Serrated or ''jerky'' flow is a well-known phenomenon that has been extensively studied due to its negative effects on the surface of forged components. Serrated flow has several potential causes including formation of twins, Table 5 Typical minimum room temperature tensile properties for selected austenitic stainless steels [21] [27][28][29]. The latter of these mechanisms is often referred to as the Portevin-Le Chatelier effect.…”

Section: à4mentioning

confidence: 99%

Microstructure and Mechanical Behavior of High-Entropy Alloys

Licavoli

Gao

Sears

et al. 2015

J. of Materi Eng and Perform

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High-entropy alloys (HEAs) have generated interest in recent years due to their unique positioning within the alloy world. By incorporating a number of elements in high proportion, usually of equal atomic percent, they have high configurational entropy, and thus, they hold the promise of interesting and useful properties such as enhanced strength and alloy stability. The present study investigates the mechanical behavior, fracture characteristics, and microstructure of two single-phase FCC HEAs CoCrFeNi and CoCrFeNiMn with some detailed attention given to melting, homogenization, and thermo-mechanical processing. Ingots approaching 8 kg in mass were made by vacuum induction melting to avoid the extrinsic factors inherent to small-scale laboratory button samples. A computationally based homogenization heat treatment was given to both alloys in order to eliminate any solidification segregation. The alloys were then fabricated in the usual way (forging, followed by hot rolling) with typical thermo-mechanical processing parameters employed. Transmission electron microscopy was subsequently used to assess the single-phase nature of the alloys prior to mechanical testing. Tensile specimens (ASTM E8) were prepared with tensile mechanical properties obtained from room temperature through 800°C. Material from the gage section of selected tensile specimens was extracted to document room and elevated temperature deformation within the HEAs. Fracture surfaces were also examined to note fracture failure modes. The tensile behavior and selected tensile properties were compared with results in the literature for similar alloys.

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“…Gears subjected to large loading and high speeds are very often used in marine power rear transmission system; regularly in the process of alternating meshing, thermal expansion elastic deformation occurs. 1,2 When the teeth profile is deviated from the standard involute, the strong impact and vibration may occur in the meshing gear process. 3,4 A great deal of studies 5,6 have considered that the size and distribution of contact pressure on teeth surface would directly affect the frictional heat flow on meshing teeth surface and made a decisive influence on the temperature of gear body.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical coupled contact analysis of alternating meshing gear teeth surfaces for marine power rear transmission system considering thermal expansion deformation

Wang

Shao

Wang

et al. 2018

Advances in Mechanical Engineering

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Marine power rear transmission system is a constant power system under specific working condition, which relies on alternating meshing gears to transfer the movement and torque. It is difficult to accurately determine the actual thermal stress and thermal deformation for time-varying distribution using the traditional methods. Elastic structural mechanics modeling and method details of thermal expansion deformation are presented and analyzed. Both the actual reflection thermoelastic contact condition for meshing gears and the coupling effect results of the practical loading process of marine power rear transmission system carried out on alternating meshing gear surfaces are also detailed. In this article, the changes in gear meshing angles of several key meshing positions are presented. The 16 meshing positions of contact stresses and loaded deformation approach are analytically evaluated in terms of the rotation range of driving spur gear (35°) and driving helical gear (36°). The purpose of this study is to confirm the significant stress concentration areas of gear meshing in and meshing out and to obtain that the deformation amounts of gear meshing impact positions within selected zones. The aim of this article is to reach gear deformation on the basis of theoretical conception.

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Investigation using digital image correlation of Portevin-Le Chatelier Effect in Hastelloy X under thermo-mechanical loading

Cited by 38 publications

References 35 publications

Interrelation between the Portevin Le-Chatelier effect and necking in AlMg alloys

Interrelation between the Portevin Le-Chatelier effect and necking in AlMg alloys

Microstructure and Mechanical Behavior of High-Entropy Alloys

Thermomechanical coupled contact analysis of alternating meshing gear teeth surfaces for marine power rear transmission system considering thermal expansion deformation

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