|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels IV
||Understanding the Effect of Nickel on the Microstructure of Low Density FeMnAl Steels
||Laura N. Bartlett, Michael Piston, Ronald O'Malley, Krista Limmer, Daniel Field
|On-Site Speaker (Planned)
Additions of nickel to high manganese and aluminum low density steels have been shown to greatly increase strength by forming hard intermetallic B2 precipitants within the austenite matrix. In this study the effects of nickel additions between 5 and 8wt.% were investigated as a function of thermomechanical processing in a Fe-20Mn-9Al-0.9C steel. Increasing the amount of nickel from 5 to 8% produced a higher density and a finer distribution of nano-sized B2 within the austenitic matrix after hot rolling and subsequent annealing at 950°C. Electron microscopy confirmed that these precipitants were consistent with B2-type NiAl. Increasing the annealing temperature from 950 to 1050°C, greatly coarsened B2 precipitation on grain boundaries as well as matrix B2. Therefore, the size and morphology of these precipitants must be carefully controlled by using an appropriate thermomechanical processing and annealing approach to avoid a deleterious reduction in ductility and toughness.
||Planned: Supplemental Proceedings volume