|About this Abstract
||10th International Symposium on Superalloy 718 and Derivatives (2023)
||Superalloy 718 and Derivatives
||Effect of Short-term Isothermal Exposure on the Ductility Signature of Waspaloy in the Temperature Range of 750-950°C – A Comparison with Haynes® 282®
||Fabian Hanning, Abdul Khaliq Khan, Olanrewaju Ojo, Joel Andersson
|On-Site Speaker (Planned)
The evolution of microstructure and ductility has been investigated for Waspaloy after isothermal exposure between 5 and 1800s at 750 to 950°C. Gamma prime (γ’) with 1.7 nm diameter is found in the mill-annealed condition, while precipitate-growth following a t1/3 relationship is observed for isothermal exposure. Grain boundary carbide networks are formed during isothermal exposure together with a rapid hardness increase. A drop in ductility is observed with the lowest values at 750 and 800°C. Further ductility reduction during isothermal exposure correlates with the rapid hardness increase of Waspaloy. While grain boundary strengthening can compensate for the moderate age hardening observed for Haynes® 282®, the more rapid hardness increase due to γ' precipitation appears to be the dominating effect on ductility in Waspaloy. Carbide precipitation and growth kinetics are slower than those of Haynes® 282®, further increasing the relative effect of age hardening reactions on the ductility of Waspaloy.
||Definite: At-meeting proceedings