Effects of microstructure and crystallography on mechanical properties of cold-rolled SAE1078 pearlitic steel

Liu, Y.; Yang, Cheng; Liu, M.; Wang, C. H.; Dai, Yumei; Li, X.; Russell, Alan M.; Zhang, C. X.; Zhang, Z. H.; Cao, Guanghui

doi:10.1016/j.msea.2017.10.050

Cited by 18 publications

(10 citation statements)

References 46 publications

(61 reference statements)

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“…4). We see that our CNL alloy exhibits an order of magnitude larger uniform elongation than lamellar pearlitic steels while maintaining a tantamount strength 44,45 . Meanwhile, our CNL alloy shows a twofold strength and uniform elongation advantage over lamellar titanium alloys 35,36 .…”

Section: Discussionmentioning

confidence: 76%

“…4 Tensile properties of our CNL alloy compared with those of other materials. The reference materials include lamellar-structured alloys (Ti alloy 35,36 , Fe alloy 37 , Co alloy 38 , Ni alloy 39 , Zr alloy 40 , HEA 41,42 , TiAl alloy 43 , pearlitic steel 44,45 , bainitic steel 46 , and twinning-induced plasticity (TWIP) steel 47 ), laminated metal composites (Al/Ti 48 , Ti/Ta 49 , Fe/Cu 50 , Cu/Zr 51 , Cu/Nb 52 , and steel/steel 53 ), and nanostructured metals (Al 54 , Ni 55 , Mo 56 , and W 57 ). Our CNL alloy (red dot) clearly outperforms other high-performance materials and overcomes the long-standing dilemma of the strength-ductility trade-off.…”

Section: Discussionmentioning

confidence: 99%

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Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures

et al. 2020

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Nano-lamellar materials with ultrahigh strengths and unusual physical properties are of technological importance for structural applications. However, these materials generally suffer from low tensile ductility, which severely limits their practical utility. Here we show that markedly enhanced tensile ductility can be achieved in coherent nano-lamellar alloys, which exhibit an unprecedented combination of over 2 GPa yield strength and 16% uniform tensile ductility. The ultrahigh strength originates mainly from the lamellar boundary strengthening, whereas the large ductility correlates to a progressive work-hardening mechanism regulated by the unique nano-lamellar architecture. The coherent lamellar boundaries facilitate the dislocation transmission, which eliminates the stress concentrations at the boundaries. Meanwhile, deformation-induced hierarchical stacking-fault networks and associated high-density Lomer-Cottrell locks enhance the work hardening response, leading to unusually large tensile ductilities. The coherent nano-lamellar strategy can potentially be applied to many other alloys and open new avenues for designing ultrastrong yet ductile materials for technological applications.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures

et al. 2020

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“…Generally, in common pearlitic colony without embedded granular carbides, it is almost impossible to obtain so many fractured cementite lamellas and fresh ultrafine ferrites with so low-strain cold deformation [25,27,28]. In Ref.…”

Section: Granular Carbides-assisted Grain Refinement In Pearlitic Steel During Cold Rollingmentioning

confidence: 99%

“…In Ref. [28], the microstructure was gradually refined with an increase in the rolling strain. The ILS of pearlite decreased and no fractured cementite lamella showed.…”

Section: Granular Carbides-assisted Grain Refinement In Pearlitic Steel During Cold Rollingmentioning

confidence: 99%

Granular Carbides-Assisted Ultrafine-Ferrite Fabrication in the Pearlitic Steel Without Severe Plastic Deformation and Annealing

Han

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The evolution of ferrite grain and cementite lamella during cold rolling in a granular carbide-pearlite steel has been investigated. Particular attention has been given to a quantitative characterization of changes in the ferrite grains. Electron backscattered diffraction and transmission electron microscopy observations show that the ultrafine ferrite (~ 388 nm) can be produced through low equivalent strain cold rolling without severe plastic deformation (SPD) and annealing. The average grain size of ferrite depends on the volume fraction, shape and distribution of granular carbides as well as interlamellar spacing of pearlite. A general explanation of granular carbides-assisted grain refinement is that the embedded carbides between natural barrier will significantly facilitate dislocation nucleation during cold rolling. Dislocation reaction occurs more drastically and quickly near these granular carbides. Such reactions promote the formation of high-angle grain boundaries. The formation of ultrafine ferrite grains and subgrains in steel after cold rolling to ε = 1.4 strain makes the strength and ductility increased simultaneously compared with ε = 0.6 cold-rolled steel. The results suggest a new material design strategy to obtain ultrafine-grained structure via the granular carbides assistance.

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“…There are many factors affecting the mechanical properties of cold rolled steel sheet, Example as cold rolling reduction ratio increase, recrystallization temperature and recrystallization soaking time significantly decrease [1]. In order to obtain the extreme high strength of pearlitic steel sheet, it is favorable to increase the cold-rolling reduction ratio (at least 90%) to achieve the solid solution hardening effect [2]. In Batch Annealing, temperature of strip depends upon thickness, width, weight and stack position of the coil.…”

Section: %Elongationmentioning

confidence: 99%

Factors Affecting the Mechanical Properties Variation after Annealing Of Cold Rolled Steel Sheet

Wichienrak

Puajindanetr

2019

E3S Web Conf.

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Cold rolled steel industry in type of batch annealing furnace, the mechanical properties of steel sheet have variation by each position. The parameters of annealing temperature and time were analysed to work out the source of mechanical properties variation. This experiment is using low-carbon steel sheet that were cold rolled at the same reduction ratio. Then annealed applying by different annealing temperature and soaking time in laboratory furnace. The mechanical properties which were examined. Yield strength, Tensile strength, %Elongation and Hardness. The result showed that (1) Increasing the annealing temperature could remarkably decrease the yield strength, tensile strength and hardness, whereas the %Elongation could be increased. (2) Increasing the soaking time could slightly effect on mechanical properties. (3) The annealing temperature of 650°C with soaking time of 2 hr should be applied to provide the mechanical properties close to target value (4) Grain size of the workpieces trended to be grown from the annealing temperature of 610°C.The experiment it can be concluded that annealing temperature and soaking time have significant effect on the mechanical properties variation in batch annealing.

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Effects of microstructure and crystallography on mechanical properties of cold-rolled SAE1078 pearlitic steel

Cited by 18 publications

References 46 publications

Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures

Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures

Granular Carbides-Assisted Ultrafine-Ferrite Fabrication in the Pearlitic Steel Without Severe Plastic Deformation and Annealing

Factors Affecting the Mechanical Properties Variation after Annealing Of Cold Rolled Steel Sheet

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