Microstructure Evolution and Mechanical Properties of Austenite Stainless Steel with Gradient Twinned Structure by Surface Mechanical Attrition Treatment

Gradient structures in engineering materials produce an impressive synergy of strength and plasticity, thereafter, have recently attracted extensive attention in the material families. Gradient structured stainless steels (SS) were prepared by surface mechanical attrition treatment (SMAT) with diffe...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2021-06, Vol.11 (6), p.1624
Main Authors: Chen, Aiying, Wang, Chen, Jiang, Jungan, Ruan, Haihui, Lu, Jian
Format: Article
Language:English
Subjects:
austenitic stainless steel
Austenitic stainless steels
Comminution
Ductility
Fractures
Grain size
Mechanical properties
mechanical property
Microstructure
multi-scaled twin
Scanning electron microscopy
Spatial distribution
Stainless steel
strengthening
surface mechanical attrition treatment
Twins
Velocity
Yield stress
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Summary:Gradient structures in engineering materials produce an impressive synergy of strength and plasticity, thereafter, have recently attracted extensive attention in the material families. Gradient structured stainless steels (SS) were prepared by surface mechanical attrition treatment (SMAT) with different impacting velocities. The microstructures of the treated samples are characterized by gradient twin fraction and phase constituents. Quantitative relations of gradient microstructure with impacting time and mechanical properties are analyzed according to the observations of SEM, TEM, XRD, and tests of mechanical property. The processed SSs exhibited to be simultaneously stiff, strong, and ductile, which can be attributed to the co-operation of the different spatial distributions of multi-scaled structures. The formation of gradient twinned structure is resolved and the strengthening by gradient structure is explored.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano11061624