Nanoindentation study of cementite size and temperature effects in nanocomposite pearlite: A molecular dynamics simulation

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We carry out molecular dynamics simulations of nanoindentation to investigate the effect of cementite size and temperature on the deformation behavior of nanocomposite pearlite composed of alternating ferrite and cementite layers. We find that, instead of the coherent transmission, dislocation propagates by forming a widespread plastic deformation in cementite layer. We also show that increasing temperature enhances the distribution of plastic strain in the ferrite layer, which reduces the stress acting on the cementite layer. Hence, thickening cementite layer or increasing temperature reduces the likelihood of dislocation propagation through the cementite layer. Our finding sheds a light on the mechanism of dislocation blocking by cementite layer in the pearlite. (C) 2016 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2016-09
Language
English
Article Type
Article
Keywords

ATOMISTIC SIMULATION; DEFORMATION-BEHAVIOR; STACKING-FAULTS; STEEL; FRACTURE; INDENTATION; MECHANISMS; PLANES; FILMS; GRAIN

Citation

CURRENT APPLIED PHYSICS, v.16, no.9, pp.1015 - 1025

ISSN
1567-1739
DOI
10.1016/j.cap.2016.05.024
URI
http://hdl.handle.net/10203/213889
Appears in Collection
ME-Journal Papers(저널논문)
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