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

Authors :
Seunghwa Ryu
Ali Karimi Taheri
Hadi Ghaffarian
Keonwook Kang
Source :
Current Applied Physics. 16:1015-1025
Publication Year :
2016
Publisher :
Elsevier BV, 2016.

Abstract

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.

Details

ISSN :
15671739
Volume :
16
Database :
OpenAIRE
Journal :
Current Applied Physics
Accession number :
edsair.doi...........0c199c79e8aaa478e5f32f947940ed1e
Full Text :
https://doi.org/10.1016/j.cap.2016.05.024