Ductile–brittle transition of polycrystalline iron and iron–chromium alloys

Tanaka, Masaki; Wilkinson, Angus J.; Roberts, Steve

doi:10.1016/j.jnucmat.2008.06.039

Cited by 28 publications

(5 citation statements)

References 28 publications

(39 reference statements)

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“…The fracture mechanism of nanocrystalline bcc iron is very different from that of coarse-grained iron under a high loading rate. Experimental results show that the fracture behavior of coarse-grained iron is determined by the twinning onset and dislocation motion at the crack tip under high loading rates [ 46 ]. There is no evidence that grain boundaries far from the crack tip provide sites for plastic deformation during the fracture process of coarse-grained iron specimens with a sharp crack.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron

Zhao,

Wang,

Bie

et al. 2024

Nanomaterials

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Nanocrystalline metals have many applications in nanodevices, especially nanoscale electronics in aerospace. Their ability to resist fracture under impact produced by environmental stress is the main concern of nanodevice design. By carrying out molecular dynamics simulations under different fast loading rates, this work examines the effect of impact load on the fracture behavior of nanocrystalline bcc iron at an atomistic scale. The results show that a crack propagates with intergranular decohesion in nanocrystalline iron. With the increase in impact load, intergranular decohesion weakens, and plastic behaviors are generated by grain boundary activities. Also, the mechanism dominating plastic deformation changes from the atomic slip at the crack tip to obvious grain boundary activities. The grain boundary activities produced by the increase in impact load lead to an increase in the threshold energy for crack cleavage and enhance nanocrystalline bcc iron resistance to fracture. Nanocrystalline bcc iron can keep a high fracture ductility under a large impact load.

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Section: Resultsmentioning

confidence: 99%

The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron

Zhao,

Wang,

Bie

et al. 2024

Nanomaterials

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“…The result of present study is deviated from the regression line drown form the other points. Other data are from: Si 14) , GaAs 35) , Ge 9) , Al 2 O 3 15) , Mo 36) , SiC 37) , TiAl 10) , diamond 38) , Fe-3%Si 39) , V 40) , Fe 41,42) . …”

Section: 実験方法mentioning

confidence: 99%

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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“…[8][9][10] Many pioneering works [11][12][13][14][15] have been performed to elucidate the fundamental mechanism behind the BDT by using silicon single crystals since St. John 1) demonstrated that they showed very sharp transition behaviour and strong deformation rate dependence of the BDT temperature. It suggests that the controlling process of the BDT behaviour is a thermally activated process so that the activation energy was obtained from the deformation rate dependence of the transition temperature.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Boron/Antimony on the Brittle-to-Ductile Transition in Silicon Single Crystals

2010

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The brittle-to-ductile transition (BDT) in boron or antimony doped Czochralski (CZ) silicon single crystals was investigated by three-point bending. The temperature dependence of the apparent fracture toughness was measured in three different crosshead speeds, indicating that the BDT temperature in boron doped silicon is the same as that in non-doped one while the BDT temperature in antimony doped silicon is lower than that in non-doped one. The activation energy was obtained from the deformation rate dependence of the BDT temperature, suggesting that the dislocation velocity in boron doped silicon is the same as that in non-doped while the dislocation velocity in antimony doped is larger than that in non-doped one.

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Ductile–brittle transition of polycrystalline iron and iron–chromium alloys

Cited by 28 publications

References 28 publications

The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron

The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron

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

The Effect of Boron/Antimony on the Brittle-to-Ductile Transition in Silicon Single Crystals

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