Microstructure and mechanical properties of Inconel 617 after degradation

Abstract

Short-term high temperature degradation test was conducted on Inconel 617, a candidate tube material for temperature gas-cooled reactors (HTGR), to evaluate the variation of microstructure and mechanical property in 1050oC during 1000h. The dominant oxide layer was Cr-oxide and a very shallow Cr-depleted region was observed matrix region, after 1000h degradation, precipitate shape was changed to the chain shape and increased amount of precipitate. These results influenced mechanical property of the specimen which exposed in high temperature.