Abstract
The growth of cracks from spark-machined slits and gouged grooves under thermal shock conditions has been studied in 316 stainless steel using sodium as the heat transfer medium. The cycles consisted of a step increase in temperature followed by a tensile hold at 600°C. Comparative uniaxial creep-fatigue tests have been performed isothermally at 600°C. Differences in the stress distributions in the uniaxial and thermal shock specimens led to higher crack growth rates in the uniaxial tests. These have been taken into account in theoretical predictions based on the creep parameter C*. This led to very reasonable upper bounds to the experimentally observed increase in crack growth rate due to hold time for both types of specimen.
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