SYMPOSIA PAPER Published: 01 January 2010
STP49012S

Interrelationship between True Stress—True Strain Behavior and Deformation Microstructure in the Plastic Deformation of Neutron-Irradiated or Work-Hardened Austenitic Stainless Steel

Source

True stress-true strain relation and deformation microstructure have been examined for high purity Fe-18Cr-12Ni alloy and its alloys doped with 0.7 wt % Si or 0.09 wt % C. In high purity alloy and C-doped alloy irradiated at 240°C up to 3 dpa, the work hardening rate is equivalent to that in unirradiated alloys. These alloys show dislocation channel structure after irradiation and deformation. In irradiated Si-doped alloy, however, the work hardening rate is different from that in unirradiated alloys. This alloy shows fully developed dislocation cell structure after deformation, as seen in unirradiated deformed stainless steels. The cell structure in irradiated Si-doped alloy was much smaller than that in unirradiated Si-doped alloy and in type 316L stainless steel. One of the factors affecting the change in the work hardening rate of irradiated austenitic stainless steel at 240°C is strong obstacles such as γ precipitate that acts as dislocation pining and dislocation loops such as Frank loops that do not act as obstacles.

Author Information

Kondo, K.
Japan Atomic Energy Agency, Ibarakiken, Japan
Miwa, Y.
Japan Atomic Energy Agency, Ibarakiken, Japan
Tsukada, T.
Japan Atomic Energy Agency, Ibarakiken, Japan
Yamashita, S.
Japan Atomic Energy Agency, Ibaraki-ken, Japan
Nishinoiri, K.
Japan Atomic Energy Agency, Ibaraki-ken, Japan
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Details
Developed by Committee: E10
Pages: 220–237
DOI: 10.1520/STP49012S
ISBN-EB: 978-0-8031-8417-6
ISBN-13: 978-0-8031-3425-6