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Three Distinct Deformation Behaviors of Cementite Lamellae in a Cold-Drawn Pearlitic Wire
Tuo Xin,Guiju Liu,Wenshuang Liang,Rongsheng Cai,Honglei Feng,Chen Li,Jian Li,Yiqian Wang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.4
High-resolution transmission electron microscopy is used to investigate the deformation behaviors of cementite lamellaein the heavily cold-drawn piano wires. Three distinct morphologies of cementite are observed, namely, complete lamella,partly-broken lamella and nearly-disappeared lamella. For the complete cementite lamella, it remains a single-crystallinestructure. For the partly-broken cementite lamella, polycrystalline structure and neck-down region appear to release theresidual strain. The lattice expansion of ferrite takes place in two perpendicular directions indicating that the carbon atomsdissolve from cementite into ferrite lattices. An orientation relationship is found between ferrite and cementite phases in thecold-drawn pearlitic wire.