Full Rejuvenation Heat Treatment of GTD 111DS

Previous studies performed by TEServices, Sulzer and EPRI showed that GTD111 DS metallurgical and mechanical [stress rupture (SR) and low cycle fatigue (LCF)] properties can be restored close to new with and without hot isostatic pressing (HIP) followed by full solution heat treatment (FSHT). Based on this success, a full rejuvenation heat treatment (FRHT) was developed that can obtain GTD 111DS metallurgical condition and mechanical properties which are better than new. This paper will show the metallurgical condition differences between new material, partial solution heat treatment (PSHT), FRHT and the related mechanical (SR and LCF) properties. A mechanical test was developed that varied exposure of FSHT and FRHT specimens between stress (SR) and fatigue (LCF) which is especially important for high starts and relatively low hour gas turbine operation. This study proved that the FRHT provides superior metallurgical and mechanical properties when compared to FSHT and new GTD 111DS.