Local deformation behavior of 304 stainless steel in high temperature hydrogen environment

Abstract

Hydrogen-fueled gas turbines are being expected to contribute achieving carbon neutrality. The components used in the gas turbine are exposed to a hydrogen environment of several hundred degrees Celsius. Therefore, it is essential to evaluate the effect of hydrogen on damage processes. Creep tests were conducted using 304 stainless steel in a hydrogen environment at 500℃ and the surface damage morphologies were evaluated. In the hydrogen environment, cracks and slip lines were observed on the surface, and the surface slip density was higher in the hydrogen environment compared to that in the argon environment. It was considered that the higher surface slip density is induced due to the activation of dislocation motion by hydrogen.