Novel thermomechanical processing methods for achieving ultragrain refinement of low-carbon steel without heavy plastic deformation

Zhao, Lijia; Park, Nokeun; Tian, Yanzhong; Chen, Shuai; Shibata, Akinobu; Tsuji, Nobuhiro

doi:10.1080/21663831.2016.1208301

Cited by 48 publications

(19 citation statements)

References 31 publications

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“…Figure 15(a) schematically illustrates the mechanisms. 56,57) When austenite (£) is hotdeformed at supercooled temperatures under certain deformation conditions, DT to ferrite (¡) occurs to form relatively fine ferrite microstructures. Although the DT ferrite grow after nucleation, they then show DRX during continuous deformation.…”

Section: Simpler Ways To Fabricate Ultrafine Grained Metals Without Smentioning

confidence: 99%

Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys

et al. 2019

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Severe plastic deformation (SPD) have had a revolutionary impact in fabricating ultrafine grained (UFG) or nanostructured metallic materials with bulky dimensions. It is, however, difficult to understand from a viewpoint of conventional metallurgy why UFG microstructures form in the as-deformed (as-SPD-processed) state without annealing process. The mechanism of UFG evolution has not yet been perfectly recognized and even some confusions have been induced. Experimental results of systematic observations on the evolution of microstructures during SPD were introduced in the present manuscript, and it was concluded from the results that the formation of UFG microstructures during SPD could be understood in terms of the grain subdivision mechanism. Consequently, the UFG microstructures formed by SPD have the deformed (strain-hardened) characteristics, which influences their mechanical properties. Besides the breakthrough in grain refinement, some features of SPD processes have become barriers for practical applications of UFG materials and scaling-up of the processes. Several new processes combining phase transformation with plastic deformation were introduced for fabricating UFG microstructures without huge plastic strains, and UFG microstructures successfully obtained by the new processes were shown. Finally, recent finding of fully recrystallized UFG microstructures in some alloys having average grain sizes of several hundred nano-meters was exhibited. The fully recrystallized UFG metals all showed both high strength and large ductility, because of the capability of strain hardening in the structures. These recent results are expected to open great possibilities of UFG or nanostructured metals as advanced structural materials. [

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Section: Simpler Ways To Fabricate Ultrafine Grained Metals Without Smentioning

confidence: 99%

Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys

et al. 2019

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“…In recent years, ultrafine-grained structure steel with grain size below 1 µm has shown the prospect of high strength and toughness with traditional steel compositions [5,6]. For the fabrication of ultrafine-grained structure steel, both severe plastic deformation strategies (SPD) and advanced thermomechanically controlled processes (TMCP) were applied [7,8]. Severe plastic deformation strategies (SPD) usually use large accumulated plastic strain, which is larger than four at room or elevated temperatures [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rolling Reduction on Microstructure and Property of Ultrafine Grained Low-Carbon Steel Processed by Cryorolling Martensite

Yuan

Liu

et al. 2018

Metals

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A novel method of cryorolling martensite for fabricating ultrafine grained low-carbon steel with attractive strength was proposed. The results indicate that ultrafine-grain structured steel could be manufactured by cryorolling and the subsequent annealing of martensite. The mean ferrite size of 132.0 nm and the tensile strength of 978.1 MPa were obtained in a specimen with a reduction of 70% in thickness. There were peak value and valley value in the strength and grain size of ferrite with the increase of reduction from 50% to 80%, respectively. The further growth of ferrite grain at 80% reduction is attributed to the heavier distortion energy at large reduction, which activates the secondary recrystallization of ferrite. Furthermore, the distribution of ferrite grains became more uniform with increasing of reduction from 50% to 70%. Additionally, the amount of lamellar dislocation cell substructure increased with the reduction at liquid nitrogen temperature.

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“…However, strength and ductility display a trade‐off relation in most cases for metallic materials . While it is challenging to achieve simultaneous improvement of strength and ductility, some successful strategies have been developed to fabricate materials with different microstructures, including nanotwinned structure, gradient structure, dispersion‐strengthened nanostructure, homogenous ultrafine‐grained (UFG) structure, heterogeneous structure, and so on. Among these various strategies, heterogeneous materials with superior mechanical properties can be conveniently designed and fabricated by imposing intense plastic strain and subsequent heat treatments …”

Section: Introductionmentioning

confidence: 99%

Significant Enhancement in Cryogenic Mechanical Properties of Cu–Al Alloy via Minor Recrystallization

et al. 2018

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The mechanical properties of cold-rolled (CR) and partially recrystallized (PRX) Cu-Al alloy are investigated by tensile tests at 77 and 293 K. While the uniform elongation is limited for the CR specimens at both temperatures, uniform elongation is enhanced unprecedentedly from 2.4% at 293 K to 16.5% at 77 K for the PRX specimens. In contrast to the sole contribution of recrystallized grains via wavy slip at 293 K, the prominent uniform elongation at 77 K is attributed to the multiple deformation mechanisms within recrystallized grains and the harmonization of plastic deformation between recrystallized grains and matrix.

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Novel thermomechanical processing methods for achieving ultragrain refinement of low-carbon steel without heavy plastic deformation

Cited by 48 publications

References 31 publications

Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys

Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys

Effect of Rolling Reduction on Microstructure and Property of Ultrafine Grained Low-Carbon Steel Processed by Cryorolling Martensite

Significant Enhancement in Cryogenic Mechanical Properties of Cu–Al Alloy via Minor Recrystallization

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