Hetero-deformation induced strengthening and toughening of pure iron with inverse and multi-gradient structures

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • F.J. Guo
  • Y.F. Wang
  • M.S. Wang
  • Q. He
  • H. Ran
  • C.X. Huang

Detail(s)

Original languageEnglish
Article number139256
Journal / PublicationMaterials Science and Engineering A
Volume782
Online published18 Mar 2020
Publication statusPublished - 24 Apr 2020
Externally publishedYes

Abstract

Here an inverse gradient structure (IGS) is processed by induction heat treatment on ultrafine-grained substrate, and a multi-gradient structure (MGS) is gained by surface mechanically peening treatment on IGS material. The grain size distributions of coarse-ultrafine and nanostructure-coarse-ultrafine gradient from surface to interior are identified in IGS and MGS materials, respectively. Gradient structures maintain reasonable elongation and at the same time display 3–4 times higher yield strength as compared with homogeneous coarse-grained counterpart, indicating improved strength-ductility synergy. Moreover, it is found that the fracture of gradient structures depends largely on the high internal stress caused by the heterogeneous deformation of layers.

Research Area(s)

  • Heterogeneous deformation, Inverse gradient structure, Mechanical incompatibility, Multi-gradient structure, Synergistic strengthening

Citation Format(s)