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. 2017 Jan 9;7:40231. doi: 10.1038/srep40231

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Copyright © 2017, The Author(s)

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(a) Through (e) show optical micrographs of the TWIP, LC, and IF steel sheets and T2L and T2L sheets. (f,g) Show SEM micrographs of the TWIP/LC and TWIP/IF interfacial regions of T2L and T2I sheets, respectively. (h) Shows a TEM micrograph of the TWIP/LC interfacial region of T2L sheets. TWIP/LC and TWIP/IF interfaces are well bonded without pores or voids, which indicates a successful fabrication of the TWIP-cored three-layer sheets by the hot-roll-bonding. Thin elongated pearlites of about 1 μm in thickness are found along the TWIP/LC and TWIP/IF interfaces as indicated by arrows in (f,g). In the magnified TEM micrograph of the thin interfacial pearlite, most of cementite lamellae are very closely spaced, and are aligned in the direction perpendicular to the interface.