| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Influence of Microstructure, Texture and Heat Treatments on the Mechanical Properties of Additively Manufactured Hastelloy X |
| Author(s) |
Benedikt Diepold, Steffen Neumeier, Mathias Göken |
| On-Site Speaker (Planned) |
Benedikt Diepold |
| Abstract Scope |
The solid-solution strengthened Ni-base superalloy Hastelloy has an outstanding high temperature stability and good weldability. The processing of the alloy by the SLM-process results in different microstructures and phase fractions in comparison to conventionally processed material. The work examines the dendritic microstructures in the as-built condition and highlights differences in the grain morphology in the xz- and yz-plane, which have been found although a rotating scan pattern was used. Heat treatments are applied to reduce residual stresses and thus the formation of cracks. The standard heat treatment at 1177 °C causes the dissolution of fine dendritic structures and a partly recrystallization, which both leads to a decrease in strength compared to the as-built condition. Heat-treating at temperatures of around 900 °C leads to the formation of small precipitates and only to a partly dissolution of the fine dendrites resulting in an increased strength. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |