J. Phys. IV France 110 (2003) 857
Dynamic properties of nitrogen alloyed 1045 iron-carbon-steelE. Lach1, H. Nahme2 and I. Rohr2
1 French-German Research Institute of Saint-Louis, 5 rue du Général Cassagnou, 68301 Saint-Louis, France
2 Ernst-Mach-Institut, Eckerstrasse 4, 79104 Freiburg i Br., Germany
A new high-pressure melting process enables nitrogen addition to ferritic Fe-C-alloys. A commercial-grade steel alloy, 1045, was cast under elevated nitrogen pressure, resulting in solid solution (austenite, ferrite, and martensite) and a porous microstructure. The retained high nitrogen concentrations in the Fe-C-alloy resulted in a substantial improvement in both quasistatic and dynamic compression strength. Using Planar-Plate-Impact-Technique (PPI) together with a VISAR and Split-Hopkinson-Pressure-Bar-Technique (SHPB) the dynamic properties have been determined in the strain rate regime 10 3 s -1-106 s -1. With the PPI-Technique the Hugoniot-Elastic-Limit and the spall strength as well as the U -u and the stress-strain relation have been determined. An unusual strong slope of the U -u -relation and a very low spall strength have been observed for both nitrogen contents. In this paper, the properties of the Fe-C-N alloy with these two nitrogen contents will be compared to those of nitrogen alloyed austenitic steels.
© EDP Sciences 2003