Microstructures and Mechanical Properties of as-Drawn and Laboratory Annealed Pearlitic Steel Wires

Durgaprasad, A.; Giri, Sushil; Lenka, S.; Kundu, Saurabh; Mishra, Sushil; Chandra, Sudeshna; Doherty, R.D.; Samajdar, I.

doi:10.1007/s11661-017-4269-5

Cited by 20 publications

(8 citation statements)

References 26 publications

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“…[ 20 ] This increase is attributed to the alignment of pearlite colony along the wire axis. [ 19 ] In the current study, there are no severe plastic deformation processes involved and the resulting microstructure is isotropic as observed from the pole figures (Figure 2c,d). Therefore, an increase in the shear stress and marginal increase in torsional ductility is a direct consequence of lamellar refinement achieved through heat treatment.…”

Section: Discussionsupporting

confidence: 56%

“…Moreover, the fragmentation of cementite lamellae may lead to annihilation of positive and negative dislocation accumulated across the cementite lamellae. [ 18 ] This effect results in the flattening of shear stress–strain curve obtained from a torsion test [ 18,19 ] unlike a continuous hardening effect as seen in uniaxial tensile deformation. Zhou et al [ 20 ] observed that for drawing strains less than 0.68, the shear stress as well as shear strain increase with lamellae refinement resulting from higher drawing strains in cold‐drawn pearlitic wires.…”

Section: Introductionmentioning

confidence: 99%

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Deformation and Microstructural Evolution of Nanostructured Pearlite under Tension versus Torsion

Khiratkar

Mishra

Singh

2020

steel research int.

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In the current work, nanostructured pearlitic steels in bulk with interlamellar spacing of 86 and 168 nm, respectively, are developed through suitable alloying combined with appropriate heat treatment. The specimens extracted from the steels are tested separately in tension and torsion. Under tensile extension, finer pearlite shows a higher yield strength and ultimate tensile strength but fractures at a lower value of strain. However, under torsion testing, finer pearlite deforms to higher shear stress while fracturing at marginally larger shear strain than the coarser pearlite. Under torsion loading, the fractured surface of the finer pearlite presents a larger length of ductile crack propagation (DCP) extending from the circumference toward the center before initiation of cleavage fracture. Scanning electron microscopy (SEM) images of the DCP region are used to characterize the deformation of cementite lamellae, whereas electron backscattered diffraction (EBSD) maps reveal the misorientation changes in ferrite due to torsion. A more frequent and irregular change in ferrite misorientation for coarser pearlite in the DCP region is observed compared with finer pearlite. Bending and fragmentation of cementite lamellae are observed to be higher for fine pearlite, suggesting better strain accommodation. Thus, decreasing the lamellar spacing in nanostructured pearlite improves the torsional response.

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Section: Discussionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Deformation and Microstructural Evolution of Nanostructured Pearlite under Tension versus Torsion

Khiratkar

Mishra

Singh

2020

steel research int.

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“…Soft impingement of C and possibly substitutional alloying elements between neighbouring pearlite nodules can also affect the interlamellar spacing due to slow down of growth, which is called 'divergent' pearlite [91], explained earlier. As of late, Durgaprasad et al [92,93] thoroughly explored that axial pearlite alignment is the dominant parameter controlling torsional ductility of high C steels. The change in fracture aspect with altering the interlamellar spacing is very crucial for these cold-drawn wires, as per Toribio and Ovejero [94,95].…”

Section: Interlamellar Spacingmentioning

confidence: 99%

“…Heizmann et al [111] reported that a cyclic texture can also develop in the surface layers and at the wire centre, possibly, also contributing to delamination under torsion loading. Lately, Durgaprasad et al [92,93] investigated that torsional ductility is improved by cementite alignment and appropriate states of the crystallographic texture and residual stress.…”

Section: Predictionmentioning

confidence: 99%

Calculation of ductility from pearlite microstructure

Das

2018

Materials Science and Technology

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Ductility in drawn pearlitic steels’ wire is dependent on microstructural features, carbon concentration, transformation temperature and strain. An extensive literature review is performed and investigated that there are conflicting results about the effect of interlamellar spacing, pearlite colony size and prior-austenitic grain size on the toughness of these steels. This may be attributed to the differences in compositions, heat treatment, drawing conditions, the methodology applied for measuring microstructural entities and inaccuracy in measurements. Currently, a neural network model is created to correlate the complex relationship between tensile ductility with its influencing parameters in a variety of cold drawn pearlitic steels. The model has been applied to confirm that the calculations are reasonable in the context of metallurgical theories and other data published in the literature.

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“…The causes are discussed at length in Yamasaki's review [7]. Recent work [34] has revealed an additional method for mitigating delamination, that the alignment of cementite lamellae along the wire axis enhances the torsional ductility.…”

mentioning

confidence: 99%

Editorial

Bhadeshia

2018

Materials Science and Technology

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Microstructures and Mechanical Properties of as-Drawn and Laboratory Annealed Pearlitic Steel Wires

Cited by 20 publications

References 26 publications

Deformation and Microstructural Evolution of Nanostructured Pearlite under Tension versus Torsion

Deformation and Microstructural Evolution of Nanostructured Pearlite under Tension versus Torsion

Calculation of ductility from pearlite microstructure

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