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

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-ultraf...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2020-04, Vol.782, p.139256, Article 139256
Main Authors: Guo, F.J., Wang, Y.F., Wang, M.S., He, Q., Ran, H., Huang, C.X., Zhu, Y.T.
Format: Article
Language:English
Subjects:
Elongated structure
Grain size
Heat treatment
Heterogeneous deformation
Induction heating
Inverse gradient structure
Mechanical incompatibility
Multi-gradient structure
Residual stress
Substrates
Synergistic strengthening
Ultrafines
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Summary: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.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2020.139256