Temperature and strain-rate effects on deformation mechanisms in irradiated stainless steel

Conference · Tue Nov 01 04:00:00 EST 1994

OSTI ID:10109044

Brimhall, J L; Cole, J I; Vetrano, J S; Bruemmer, S M

Analysis of the deformation microstructures in ion-irradiated stainless steel shows twinning to be the predominant deformation mode at room temperature. Dislocation channelling also occurs under slow strain rate conditions. Stresses required for twinning were calculated by the model of Venables and are compatible with observed yield stresses in neutron-irradiated material if loops are the principal twin source. Computation of the expected radiation hardening from the defect structure, based on a simple model, is consistent with yield strengths measured on neutron-irradiated steels. Lower yield stresses and greater thermal energy at 288 C lessen the probability of twinning and dislocation channeling becomes the primary deformation mode at the higher temperature. However, preliminary early results show that some twinning does occur in the irradiated stainless steel even at the higher temperature when higher strain rates are used.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 10109044
• Report Number(s): PNL-SA--25518; CONF-941144--31; ON: DE95004941
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200
36 MATERIALS SCIENCE
360106
COMPONENTS AND ACCESSORIES
DEFORMATION
ION BEAMS
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
STAINLESS STEEL-304
STAINLESS STEELS
TWINNING
WATER COOLED REACTORS