Abstract
The effect of impurity concentration and dislocation structure on the creep rate of type 316 stainless steel has been investigated. A 33% cold worked, low-impurity version showed higher creep rates and an extension of quadratic stress dependence to lower stresses compared to commercial 20% cold worked material. A dislocation structure much more homogeneous than by cold working, was obtained by prestraining solution-annealed 316 at high temperatures and high stresses. This homogeneous structure allowed a more detailed investigation of microstructural development under irradiation. The irradiation creep rates were -about a factor of two lower than those of the cold worked material. Irradiation creep rates and their dependence on stress, temperature and composition are compared to fast reactor results.
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