Effect of aluminium addition on the development of high manganese TRIP steels

M. MARTIN; M. RAPOSO; J. MALARRIA

Aachen

Conferencia; 4th International Conference on Medium and High Manganese Steel; 2019

RWTH Aachen University and Max-Planck-Institut fuer Eisenforschung

The influence of aluminium addition in high manganeseTRIP steels is generally reduced to its capacity of increasing the stackingfault energy of the alloy. In this work, an additional interpretation ofaluminium effect on HMn-TRIP steels is given by means of two laboratory castwith the compositions Fe-15Mn-3Si and Fe-18Mn-2Si-2Al wt.%. At solutionannealed and water quenched condition we observe an almost complete martensitictransformation (epsilon + alpha-prime) in the Fe-15Mn-3Si alloy, while theFe-18Mn-2Si-2Al composition presents a fully austenitic matrix. Measurements ofmartensite start temperature showed a 220°C lower value for the Fe-18Mn-2Si-2Alalloy in comparison to the Fe-15Mn-3Si composition. Such difference cannot beexplained by the modification on manganese and silicon contents. Thus, theeffect of aluminium addition on high manganese steels is discussed in terms ofaustenite stability as well.