Severe plastic deformation through adiabatic shear banding in Fe–C steels
✍ Scribed by D.R. Lesuer; C.K. Syn; O.D. Sherby
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 194 KB
- Volume
- 410-411
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
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.