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.
Bibliographical noteFunding Information:
H.G. and A.K.T. acknowledge the Research Board of Sharif University of Technology, Tehran, Iran , and the Iran National Science Foundation for the financial support of the project. K. K. acknowledges the financial support from Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( 2013R1A1A2063917 ). S. R. is supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( 2013R1A1A1010091 ).
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physics and Astronomy(all)