SEDL / STP / STP1046V2-EB / STP49462S

Residual Tensile Properties at Low and High Strain Rates of AISI 316H Predamaged by Creep, Low Cycle Fatigue, and Irradiation to 2 dpa

Albertini, Carlo
Engineers, Ispra Establishment, Ispra, Va

Iida, Kunihiro
Professor emeritus, University of Tokyo, Tokyo,

Grande, Angelo Del
Engineers, Ispra Establishment, Ispra, Va

Forlani, Mario
Engineers, Ispra Establishment, Ispra, Va

Pachera, Alberto
Engineers, Ispra Establishment, Ispra, Va

Montagnani, Mario
Engineers, Ispra Establishment, Ispra, Va

Pages: 17    Published: Jan 1990

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Abstract

Residual mechanical properties have been determined in tension at low (∼0.0035 s⁻¹), medium (∼10 s⁻¹), and high strain rates (∼1000 s⁻¹), at 550°C, of American Iron and Steel Institute (AISI) 316H having previously been subjected to increasing degrees of damage by creep, low cycle fatigue, low cycle fatigue, and irradiation to 2 dpa. Strength increase and ductility reduction with respect to the as-received material have been observed. Strain rate hardening characterizes the response to dynamic loading in case of single damaging processes, while the superposition of low cycle fatigue and irradiation caused strain rate softening. Instabilities of the deformation process, shown by the flow curves, govern the phenomena.