Shock consolidation of a rapidly solidified steel powder
Abstract
Rapidly solidified AISI 9310 steel powders were consolidated by shock waves produced from the impact of high velocity flyers. Dependence of the microhardness and the ultimate tensile strength of the compacts on the initial shock pressure (from 3.6 to 17.9 GPa) and the maximum shock pressure (from 6 to 37 GPa) was measured for an initial powder density 0.6 of the bulk density and a shock duration of 2–3 s. Photomicrographs and SEM fractographs were used to study the interparticle bonding in the compacts. Results show that for initial shock pressures below 4 GPa, the compacts have negligible strength. However, above this threshold the strength of the compact rises rapidly until a maximum value of 1.3 ± 0.1 GPa is reached for an initial shock pressure of 12.4 GPa. The strength then remains constant before decreasing at the highest initial shock pressure. In marked contrast, with increasing shock pressure, the diamond pyramid hardness increases very gradually from a value of about 340 for the powder to about 500 at the highest shock pressure. The maximum strength obtained correlates reasonably well with the strength-expected from microhardness measurements.
Additional Information
© 1984 Pergamon Press Ltd. Received 29 June 1983; In revised form 4 January 1984. Research supported by United Technologies Research Center and Defense Advanced Projects Agency through the U.S. Army Materials and Mechanics Research Center. R. B. Schwan is partially supported by the U.S. Department of Energy. Contribution NO. 3919. We are grateful to Dan Kostka and Mary Jane Bartholomew for their contributions to the experimental work.Additional details
- Eprint ID
- 51172
- DOI
- 10.1016/0001-6160(84)90130-5
- Resolver ID
- CaltechAUTHORS:20141103-104135464
- United Technologies Research Center
- Defense Advanced Research Projects Agency (DARPA)
- U.S. Army Materials and Mechanics Research Center
- Department of Energy (DOE)
- Created
-
2014-11-03Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Other Numbering System Name
- Caltech Division of Geological and Planetary Sciences
- Other Numbering System Identifier
- 3919