Optimization of the strain rate to achieve exceptional mechanical properties of 304 stainless steel using high speed ultrasonic surface mechanical attrition treatment

Surface mechanical attrition treatment (SMAT), an efficient way to create nanostructured surface/subsurface layers, has been extensively exploited in the last decade. However, the impact velocity of the balls in the treatment has not yet been measured in detail. The motivation of the present paper w...

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Bibliographic Details
Published in:Acta materialia 2010-09, Vol.58 (15), p.5086-5096
Main Authors: Chan, H.L., Ruan, H.H., Chen, A.Y., Lu, J.
Format: Article
Language:English
Subjects:
Applied sciences
Attrition
Density
Exact sciences and technology
High speed
High speed deformation
Impact velocity
Mathematical analysis
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Nanocrystalline materials
Optimization
Plastic deformation
Strain rate
Twinning
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Summary:Surface mechanical attrition treatment (SMAT), an efficient way to create nanostructured surface/subsurface layers, has been extensively exploited in the last decade. However, the impact velocity of the balls in the treatment has not yet been measured in detail. The motivation of the present paper was to investigate the ball velocity and the effect of the number of balls on the resulting mechanical properties and the associated microstructures. Employing a high-speed camera, the maximum impact velocities of balls were quantified. This velocity is affected by the density and size of the ball. In the present paper an optimum number of balls for SMAT was also identified. With a detailed knowledge of the ball velocity we were able to accurately estimate the strain rate at different depths by analytical modeling and to study the correlation between the resulting microstructures and the strain/strain rate history of the material.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2010.05.044