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Evolution of Fracture Mode in Nano-twinned Fe-1.1C-12.5Mn Steel

  • Mahmoud Khedr
  • Li WeiEmail author
  • Min Na
  • Li Yu
  • Jin XuejunEmail author
Advanced High-Strength Steels for Automobiles


The evolution of fracture mode was investigated in Fe-1.1C-12.5Mn steel with prior introduced nano-twinned structures. The thicknesses of the prior twin plates were manipulated by thermo-mechanical treatments. During the plastic deformation, thin prior twin plates (30–40 nm) were penetrated by dislocations which activated secondary twin systems, and therefore dimple features were promoted in the fractured surfaces due to dislocation accommodation within the nano-twin plates. However, dislocation pile-up on the boundaries of the thick prior twin plates (90 nm) led to trans-granular fracture and formation of cracks. Moreover, prior twin elimination enhanced inter-granular feature appearance in the fractured surfaces because of dislocation accumulation on grain boundaries.



The authors are grateful to the financial support of the Chinese Scholarship Council (CSC), National Key R&D Program of China (No. 2017YFB0703003), National Natural Science Foundation of China (U1564203, Nos. 51571141 and 51201105), the Interdisciplinary Program of Shanghai Jiao Tong University (No. YG2014MS23), and the support sponsored by Program of Shanghai Academic Research Leader and provided by Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University. In addition, this research was supported by the Tescan China and Baosteel companies.

Supplementary material

11837_2019_3329_MOESM1_ESM.pdf (381 kb)
Supplementary material 1 (PDF 380 kb)


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Shanghai Key Laboratory of Material Laser Processing and ModificationShanghai Jiao Tong UniversityShanghaiChina
  2. 2.State Key Laboratory of Metal Matrix Composites, School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina
  3. 3.Mechanical Department, Faculty of Engineering at ShoubraBenha UniversityCairoEgypt
  4. 4.Key Laboratory for MicrostructuresShanghai UniversityShanghaiChina

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