Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fe

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Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fe. / Granberg, Fredric; Terentyev, Dmitry; Nordlund, Kai.

In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 352, 07.01.2015, p. 77-80.

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Harvard

Granberg, F, Terentyev, D & Nordlund, K 2015, 'Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fe' Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, vol 352, pp. 77-80. DOI: 10.1016/j.nimb.2015.01.007

APA

Granberg, F., Terentyev, D., & Nordlund, K. (2015). Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fe. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 352, 77-80. DOI: 10.1016/j.nimb.2015.01.007

Vancouver

Granberg F, Terentyev D, Nordlund K. Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fe. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 2015 Jan 7;352:77-80. Available from, DOI: 10.1016/j.nimb.2015.01.007

Author

Granberg, Fredric; Terentyev, Dmitry; Nordlund, Kai / Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fe.

In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 352, 07.01.2015, p. 77-80.

Research output: Contribution to journalArticle

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@article{42927ab9df3e4946ae546fe5afd4fa18,
title = "Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fe",
keywords = "dislocation, molecular dynamics, precipitate, carbide",
author = "Fredric Granberg and Dmitry Terentyev and Kai Nordlund",
note = "Score=10",
year = "2015",
month = "1",
doi = "10.1016/j.nimb.2015.01.007",
volume = "352",
pages = "77--80",
journal = "Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms",
issn = "0168-583X",
publisher = "Elsevier",

}

RIS - Download

TY - JOUR

T1 - Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fe

AU - Granberg,Fredric

AU - Terentyev,Dmitry

AU - Nordlund,Kai

N1 - Score=10

PY - 2015/1/7

Y1 - 2015/1/7

N2 - Different types of carbides are present in many steels used as structural materials. To safely use steel in demanding environments, like nuclear power plants, it is important to know how defects will affect the mechanical properties of the material. In this study, the effect of carbide precipitates on the edge dislocation movement is investigated. Three different types of carbides were investigated by means of molecular dynamics, with a Tersoff-like bond order interatomic potential by Henriksson et al. The obstacles were 4 nm in diameter and were of Fe3C- (cementite-), Fe23C6- and Cr23C6-type. The critical unpinning stress was calculated for each type at different temperatures, to get the temperature-dependent obstacle strength. The results showed a decreasing critical stress with increasing temperature, consistent with previous studies. The critical unpinning stress was seen to be dependent on the type of carbide, but the differences were small. A difference was also observed between the obstacles with the same structure, but with different composition. This study shows the relation between the existing Cr23C6 carbide and the experimentally non-existing Fe23C6 carbide, which needs to be used as a model system for investigations with interatomic potentials not able to describe the interaction of Cr in the Fe–C-system. We found the difference to be a between 7% and 10% higher critical unpinning stress for the chromium carbide, than for the iron carbide of the same type.

AB - Different types of carbides are present in many steels used as structural materials. To safely use steel in demanding environments, like nuclear power plants, it is important to know how defects will affect the mechanical properties of the material. In this study, the effect of carbide precipitates on the edge dislocation movement is investigated. Three different types of carbides were investigated by means of molecular dynamics, with a Tersoff-like bond order interatomic potential by Henriksson et al. The obstacles were 4 nm in diameter and were of Fe3C- (cementite-), Fe23C6- and Cr23C6-type. The critical unpinning stress was calculated for each type at different temperatures, to get the temperature-dependent obstacle strength. The results showed a decreasing critical stress with increasing temperature, consistent with previous studies. The critical unpinning stress was seen to be dependent on the type of carbide, but the differences were small. A difference was also observed between the obstacles with the same structure, but with different composition. This study shows the relation between the existing Cr23C6 carbide and the experimentally non-existing Fe23C6 carbide, which needs to be used as a model system for investigations with interatomic potentials not able to describe the interaction of Cr in the Fe–C-system. We found the difference to be a between 7% and 10% higher critical unpinning stress for the chromium carbide, than for the iron carbide of the same type.

KW - dislocation

KW - molecular dynamics

KW - precipitate

KW - carbide

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/34933262

U2 - 10.1016/j.nimb.2015.01.007

DO - 10.1016/j.nimb.2015.01.007

M3 - Article

VL - 352

SP - 77

EP - 80

JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

T2 - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

SN - 0168-583X

ER -

ID: 5464303