The effect of electropulsing on the interlamellar spacing and mechanical properties of a hot-rolled 0.14% carbon steel

Rahnama, Alireza; Qin, Rong Shan

doi:10.1016/j.msea.2014.12.084

Cited by 36 publications

(15 citation statements)

References 27 publications

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“…EPT has been applied to many metals and alloys to achieve ultrafine-grained microstructure and nanostructures that arise from the solid state phase transitions and the process of recovery and recrystallization during their treatment. Figure 1 shows the variation in microstructures of copper alloy, aluminium alloy, magnesium alloy, iron and steel before and after EPT [ 52 , 54 , 55 , 56 , 57 , 58 , 59 ]. In addition, the pulse current could induce the texture evolution, resulting in the formation of oriented microstructure [ 1 ].…”

Section: Effects Of Ept On Microstructure and Texturementioning

confidence: 99%

“…Spheroidization referred to the cementite flakes of nanometre size transforming into discontinuous globular grains in the pearlite structure. Processes similar to spheroidization and grain refinement in hot rolled transformation-induced plasticity (TRIP) steel (Fe-0.14C-2.1Mn-1.0Si-0.03Al-0.025Nb) and 316L stainless steel (Fe-17Cr-10Ni-3Mo-1.5Mn) after EPT have been investigated further [ 58 , 71 , 72 ], as shown in Figure 1 (a5–a7,b5–b7). It was proposed that the application of high-density electropulsing was equivalent to additional free energy, leading to the formation of small globular cementite particles (about 30 nm) that were uniformly distributed in the matrix.…”

Section: Effects Of Ept On Microstructure and Texturementioning

confidence: 99%

“…The decrease may arise from the different degrees of refinement and spheroidization of pearlite and cementite particles within their microstructures. Rahnama et al [ 58 ] studied the relationship between hardness, yield strength, tensile strength and layer spacing of EPTed ferro-pearlitic duplex steel (0.14% C). The results suggested that it followed the Hall–Petch relationship, which confirmed the results of Samuel’s experiments.…”

Section: Effects Of Ept On the Properties Of Materialsmentioning

confidence: 99%

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Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

et al. 2018

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The technology of high-density electropulsing has been applied to increase the performance of metallic materials since the 1990s and has shown significant advantages over traditional heat treatment in many aspects. However, the microstructure changes in electropulsing treatment (EPT) metals and alloys have not been fully explored, and the effects vary significantly on different material. When high-density electrical pulses are applied to metals and alloys, the input of electric energy and thermal energy generally leads to structural rearrangements, such as dynamic recrystallization, dislocation movements and grain refinement. The enhanced mechanical properties of the metals and alloys after high-density electropulsing treatment are reflected by the significant improvement of elongation. As a result, this technology holds great promise in improving the deformation limit and repairing cracks and defects in the plastic processing of metals. This review summarizes the effect of high-density electropulsing treatment on microstructural properties and, thus, the enhancement in mechanical strength, hardness and corrosion performance of metallic materials. It is noteworthy that the change of some properties can be related to the structure state before EPT (quenched, annealed, deformed or others). The mechanisms for the microstructural evolution, grain refinement and formation of oriented microstructures of different metals and alloys are presented. Future research trends of high-density electrical pulse technology for specific metals and alloys are highlighted.

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Section: Effects Of Ept On Microstructure and Texturementioning

confidence: 99%

Section: Effects Of Ept On Microstructure and Texturementioning

confidence: 99%

Section: Effects Of Ept On the Properties Of Materialsmentioning

confidence: 99%

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Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

et al. 2018

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“…This enhanced mobility aid the niobium carbide precipitate to evolve and distribute evenly through the microstructure of the alloy. This has happened while the previous experiment at room temperature [12] had showed that the electropulsing might results in the formation of PFZs. Table 2 illustrates the mechanical properties of both samples.…”

Section: Resultsmentioning

confidence: 94%

“…Experimental observation in this study has shown that the lamellar structure forms in a direction parallel to that of the electric current flow [11]. In a separated study, the authors have reported that electropulsing treatment affects the distribution of niobium carbide and hence the formation of precipitation free zones (PFZs) [12]. In the present work, the experiments have been carried out at an elevated temperature (800 ºC) in order to explore the effect of electric current pulses on the microstructure evolution at a higher temperature by which the diffusion is much easier for both substitutional and interstitial atoms.…”

Section: Introductionmentioning

confidence: 75%

Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

Rahnama

Qin

2015

J. Mater. Res.

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Niobium is an important alloying element in steels. In the present work an effort has been made to investigate the effect of electropulsing on the niobium carbide (NbC) at an elevated temperature (800 ºC). The results show that the electropulsing treatment can generate an evenly distributed NbC by decreasing the kinetics barriers for precipitation. It has been also found that a semi-transformed pearlite structure forms in such a way that the grains are oriented towards a direction parallel to that of the electric current flow. Furthermore, the electropulsed sample benefits from refined grain size. This is thought to be due to the electropulse-enhanced nucleation rate. Tensile testing has been carried out in order to compare the properties of electropulsed sample with that of without electropulsing. The results show that the sample with treatment has greater yield strength and ultimate tensile stress (UTS) while its elongation is only 1% less that of the unelectropulsed samples. The improved mechanical properties of the sample with pulsing are attributed to its finer grain sizes as well as the elimination of precipitation free zones (PFZs) caused by the electropulsing treatment.

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Recent Progress in Ultrasonic Surface Rolling: A Comprehensive Overview

Yang,

Huang,

et al. 2024

Adv Eng Mater

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Metals and their alloys have found extensive applications in numerous fields. Various surface modification techniques have received significant attention for their potential to improve the adaptability of materials to complex environments. One such technique, the ultrasonic surface rolling process (USRP), introduces a deformation layer by applying static stress and dynamic impacts to the surface of metallic materials. During USRP treatment, remarkable beneficial compressive residual stresses (CRS) and hardened layers are induced and, simultaneously, the surface finish of the material is improved. These modifications not only effectively suppress the initiation and propagation of fatigue cracks but also significantly enhance the mechanical properties, wear, and corrosion resistance of the materials, thereby greatly prolonging the service life of structural components. The review starts with the mechanisms of USRP, discussing grain refinement, control of surface roughness, and the introduction of beneficial CRS. Subsequent sections provide a comprehensive analysis of how these modifications impact material properties, encompassing hardness, plasticity, fatigue, wear, and corrosion resistance. Furthermore, it introduces the latest advancements in USRP technology, including thermal/electric pulse‐assisted USRP, its integration with other surface treatment methods, and its applications and prospects across various fields.

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The effect of electropulsing on the interlamellar spacing and mechanical properties of a hot-rolled 0.14% carbon steel

Cited by 36 publications

References 27 publications

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

Recent Progress in Ultrasonic Surface Rolling: A Comprehensive Overview

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