Abstract
1. Reactor irradiation over the range of experimental parameters investigated does not have a substantial effect on the nature of the creep curves and long-term ductility of 0Kh16N15M3B steel but increases the intensity of the minimum rates of creep by almost two orders of magnitude. Here the extent of the radiation-induced increase in the rate of creep is reduced with an increase in stress intensity. 2. The ratio of the principal stresses in the experiments being discussed affects the form of the creep and long-term ductility curves appreciably in all the experiments conducted. Approximately, it can be considered that the\(\mathop {\varepsilon _i }\limits^ \bullet\) min (σi) relationship is invariant to the form of stressed state. An exception is the control experiments for σ1/σ3=−1.5. 3. The grain size of the initial structure of the steel investigated affects all the characteristics of the creep process substantially, both under normal and reactor test conditions. With an increase in the grain size the stage of accelerated creep preceding fracture is shortened, and the rate of steady-state creep and long-term ductility are lowered.
Published Version
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