Atomistic Simulation of Heavily Plastic Deformation of Pearlitic Steel: Nano-sized Processes of Wiredrawing and Indentation

5th International Conference Recent Trends in Structural Materials

Saitoh, K.^1 ; Oda, K.^2 ; Yoshida, K.^2 ; Takuma, M.^1 ; Takahashi, Y.^1 ; Sato, T.^1

Department of Mechanical Engineering, Faculty of Engineering Science, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka

564-8680, Japan^1

Graduate School of Science and Engineering, Kansai University, Japan^2

关键词: Atomistic mechanism;    Atomistic simulations;    Cementite interface;    Computational model;    Diffusion of carbons;    Dislocation emissions;    Embedded-atom method potentials;    Molecular dynamics simulations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/461/1/012074/pdf
DOI  :  10.1088/1757-899X/461/1/012074

来源: IOP

【 摘 要 】

We conduct molecular dynamics (MD) simulations of pearlitic steel in which iron and carbon atoms are included. The paper aims at clarifying micro-or nano-sized mechanism of plastic deformation of pearlitic steel in wiredrawing process. By using embedded atom method (EAM) potential, we construct a nano-sized computational wiredrawing model of pearlitic steel where lamellae structures of ferrite and cementite phases are attached to each other and it is subjected to conventional drawing condition using a hollow die. Basically, diffusion of carbon atoms around the ferrite-cementite interface is observed during plastic deformation. In order to recognize probable mechanisms by which carbon atoms migrate from cementite to ferrite, dislocation emission and its movement are observed in detail. Besides, the plasticity in pearlitic steel is also discussed in this research by using nano-indentation model where a nano-sized spherical indenter compresses lamellae structures of cementite and ferrite. Both wiredrawing and nano-indentation computational models provides new insight concerning atomistic mechanism occurring in heavily plastic deformation of pearlitic steel.