Study on Interaction Between Cyclic Plasticity and Creep by Microscopic Observation

Abstract

In this study, a series of subsequent creep tests and microscopic observations were carried out at room temperature. Creep curves after cyclic preloading on SUS304 stainless steel had the dependence of the cycle number of the cyclic loading. Microscopic observations were also conducted by TEM to confirm the dependence of the creep curves on the cycle number. The microscopic observation showed that dislocation structures changed due to the additional cyclic loading after stress-strain relation stabilized. Finally considering dislocation density creep curves were described by Boyle-Spence type creep law.