Article ID Journal Published Year Pages File Type
9795641 Materials Science and Engineering: A 2005 4 Pages PDF
Abstract
Severe plastic deformation is observed within adiabatic shear bands in iron-carbon steels. These shear bands form under high strain rate conditions, in excess of 1000 s−1, and strains in the order 5 or greater are commonly observed. Studies on shear band formation in a ultra-high carbon steel (1.3% C) are described in the pearlitic condition. A hardness of 11.5 GPa (4600 MPa) is obtained within the band. A mechanism is described to explain the high strength based on phase transformation to austenite from severe plastic deformation and adiabatic heating. Rapid re-transformation leads to an ultra-fine ferrite grain size containing carbon principally in the form of nano-size carbides. It is proposed that the same mechanism explains the ultra-high strength of iron-carbon steels observed in ball-milling, ball drop tests and in severely deformed wires.
Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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