ANISOTROPY OF UTRAFINE-LAMELLAR AND NANOLAMELLAR PEARLITIC STRUCTURES REVEALED BY IN-SITU MICRO COMPRESSION TESTING

摘要

Applying severe plastic deformation to pearlitic steels leads to a transformation of the random ultrafine-lamellar (ufl) colony structure to a nanolamellar (nl) composite. The distinct reduction of the interlamellar spacing generates a high-strength steel with a strength of up to 3.7 GPa, which can readily be produced. Additionally, the ferrite and cementite lamellae align in a preferential direction giving rise to an anisotropic mechanical response.