|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Influence of Long Term Ageing on Deformation and Damage Behavior in Alloy 617
||Guocai Chai, Guocai Chai, Mattias Calmunger, Sten Johansson, Johan Moverare
|On-Site Speaker (Planned)
Alloy 617 is a nickel based-superalloy with a good combination of high-temperature strength and oxidation resistance. It has been widely applied in a wide range of high temperature environments. Their performances must be kept constant during long periods at the elevated temperatures. In this study, the influence of long term ageing (650 or 700°C for up to 30 000 hours) on deformation and damage behavior is investigated using both impact and fracture toughness test and structure characterization with TEM and ECCI. The material shows high toughness even after long term ageing. Micro twinning is an important deformation and damage mechanism in the material aged with shorter time. However, this phenomenon decreases in the material with longer ageing time. With thermodynamic simulation, stacking fault energy in the matrix was analyzed. The results provide an evaluation on the influence of stacking fault energy on the deformation twinning behavior in this material.
||Planned: Supplemental Proceedings volume