About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Damage Mechanisms of High Temperature Alloys
|
Presentation Title |
Ferritic Bcc-Superalloys – Slip System Control Through Alloying |
Author(s) |
Johan Pauli Magnussen, David M. Collins, Alexander J. Knowles |
On-Site Speaker (Planned) |
Johan Pauli Magnussen |
Abstract Scope |
Iron-based ferritic superalloys with an A2-Fe matrix reinforced by B2-NiAl precipitates are candidate materials for low cost, high strength, creep resistant, and oxidation resistant materials for applications reaching 500°C–800°C. However, attaining good room temperature ductility is difficult due to slip incompatibility between A2 Fe ½<111> and B2 NiAl <100>. By adding ternary additions or utilising off-stoichiometric compositions, as demonstrated in monolithic NiAl intermetallics, the primary slip system can be altered; this strategy is extended here onto dual-phase A2-B2 ferritic superalloys. This study investigated two Fe-NiAl alloys with controlled Al:Ni ratios ~1:1 and ~2:1, where each alloy exhibited similar NiAl precipitate morphologies. A combination of Vickers indentation and EBSD was used to analyse the macroscopic slip traces and associated slip planes, with the 2:1 alloy exhibiting A2-like macroscopic slip, and 1:1 alloying B2-like macroscopic slip. This is a promising result, offering new design and testing approaches for ductilising ferritic superalloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, High-Temperature Materials, Mechanical Properties |