Three Distinct Deformation Behaviors of Cementite Lamellae in a Cold-Drawn Pearlitic Wire
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High-resolution transmission electron microscopy is used to investigate the deformation behaviors of cementite lamellae in 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-crystalline structure. For the partly-broken cementite lamella, polycrystalline structure and neck-down region appear to release the residual strain. The lattice expansion of ferrite takes place in two perpendicular directions indicating that the carbon atoms dissolve from cementite into ferrite lattices. An orientation relationship is found between ferrite and cementite phases in the cold-drawn pearlitic wire.
KeywordsHigh-resolution transmission electron microscopy Microstructure Deformation Cementite dissolution Orientation relationship
We would like to thank the financial support from the National Natural Science Foundation of China (Grant No. 10974105) and High-end Foreign Experts Recruitment Programs (Grant Nos. GDW20173500154, GDW20163500110). Y. Q. Wang would also like to thank the financial support from the Top-notch Innovative Talent Program of Qingdao City (Grant No. 13-CX-08), Taishan Scholar Program of Shandong Province, Qingdao International Center for Semiconductor Photoelectric Nanomaterials and Shandong Provincial University Key Laboratory of Optoelectrical Material Physics and Devices.
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