Brittle-Ductile Transition in Low Carbon Steel Deformed by the Accumulative Roll Bonding Process

Tanaka, Masaki; Higashida, Kenji; Shimokawa, Tomotsugu; Morikawa, Tatsuya

doi:10.2320/matertrans.md200817

Cited by 35 publications

(20 citation statements)

References 29 publications

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“…Materials subjected to severe plastic deformation (SPD) show outstanding mechanical properties such as high strength and toughness [1][2][3][4][5][6][7], in contrast to coarse-grained materials. In addition, it has been reported that, in severally deformed Cu, the activation volume exhibits an inverse dependence on temperature.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of effective stress in severely deformed ultralow-carbon steel

Tanaka

Higashida

2016

Philosophical Magazine

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The effects of severe plastic deformation on the thermal activation of dislocation gliding in ultralow-carbon steel at low temperatures were investigated. This was done by measuring the temperature dependences of the effective stress, activation volume and activation energy. It was found that the values of all these parameters were lower than those for coarse-grained specimens at low temperatures. In coarse-grained materials, the activation energy should increase with a decrease in the effective stress. This phenomenon, which seemed counterintuitive initially, could be physically interpreted on the basis of the fluctuation in the athermal stress.

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Section: Introductionmentioning

confidence: 99%

Temperature dependence of effective stress in severely deformed ultralow-carbon steel

Tanaka

Higashida

2016

Philosophical Magazine

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“…1820) For example, UFG copper with a large number of nano-twins shows the coexistence of high strength and high ductility 21,22) and UFG iron obtains the improved fracture toughness at low temperatures as compared to coarse-grained iron. 23,24) Therefore, UFG metals are strongly expected for new structural materials. However it is difficult to explain why these excellent mechanical properties breaking the trade-off relationship between strength and ductility (toughness) appear in UFG metals by using conventional theories or obtained elementary processes in atomistic simulations because the competition between the intragranular dislocation motion and grain-boundary-mediated plastic deformation processes could strongly influence the mechanical properties of UFG metals.…”

Section: Introductionmentioning

confidence: 99%

Influence of Competition between Intragranular Dislocation Nucleation and Intergranular Slip Transfer on Mechanical Properties of Ultrafine-Grained Metals

et al. 2013

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Huge-scale atomistic simulations of shear deformation tests to the aluminum polycrystalline thin film containing the FrankRead source are performed to elucidate the relationship between the inter-and intragranular plastic deformation processes and the mechanical properties of ultrafine-grained metals. Two-types of polycrystalline models, which consist of several grain boundaries reproducing easy and hard slip transfer, respectively, are prepared to investigate the effect of grain boundary on flow stress. While the first plastic deformation occurs by the dislocation bow-out motion within the grain region for both models, the subsequent plastic deformation is strongly influenced by the resistance of the slip transfer by dislocation transmission through grain boundaries. The influence of the competition between the intragranular dislocation nucleation and intergranular slip transfer on the material strength is considered. The nanostructured material's strength depending on local defect structures associated with grain size and dislocation source length is assessed quantitatively.

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“…Arrhenius plots obtained from the deformation dependence of the BDT temperature. The activation energy for Fe-25Cr-1.1N was found to be 1.6 ± 0.9 eV, which is much higher than that for low carbon steel obtained in previous study 20) . 22) .…”

Section: 実験方法mentioning

confidence: 38%

Brittle-to-Ductile Transition in Nickel-Free Austenitic Stainless Steels with High Nitrogen

Tanaka¹,

Onomoto²,

Tsuchiyama³

et al. 2012

Tetsu-to-Hagane

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緒言The brittle-to-ductile transition (BDT) behaviour in nickel-free austenitic stainless steel with high nitrogen was investigated. Fall-weight impact tests revealed that Fe-25mass%Cr-1.1mass%N austenitic steel exhibits a sharp BDT behaviour in spite of an fcc alloy. The aspects of plastic deformation after the impact tests indicate that the BDT observed in this austenitic steel is induced by poor ductility at low temperatures as is the same as that in ferritic steels. In order to measure the activation energy for the BDT, the strain rate dependence of the BDT temperature was examined by using four-point bending tests. The weak dependence of the BDT temperature on the strain rate was observed. The Arrhenius plot of the BDT temperature against the strain rate elucidated that the activation energy for the BDT of Fe-25mass%Cr-1.1mass%N is much higher than that of low carbon ferritic steels. The origins of such distinct BDT behaviour and its large value of the activation energy in this high-nitrogen steel are discussed in terms of the reduction of dislocation mobility at low temperatures due to the interaction between glide dislocations and nitrogen solute atoms.

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Brittle-Ductile Transition in Low Carbon Steel Deformed by the Accumulative Roll Bonding Process

Cited by 35 publications

References 29 publications

Temperature dependence of effective stress in severely deformed ultralow-carbon steel

Temperature dependence of effective stress in severely deformed ultralow-carbon steel

Influence of Competition between Intragranular Dislocation Nucleation and Intergranular Slip Transfer on Mechanical Properties of Ultrafine-Grained Metals

Brittle-to-Ductile Transition in Nickel-Free Austenitic Stainless Steels with High Nitrogen

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