Relationship between the microstructure and properties of thermomechanically processed Fe−17Mn and Fe−17Mn−3Al steels

Abstract

Two austenitic Mn steels (Fe−17Mn and Fe−17Mn−3Al (wt%, so as the follows)) were subjected to thermomechanical processing (TMP) consisting of forging followed by solutionization and hot rolling. The rolled samples were annealed at 650 and 800°C to relieve the internal stress and to induce recrystallization. The application of TMP and heat treatment to the Fe−17Mn/Fe−17Mn−3Al steels refined the austenite grain size from 169 μm in the as-solutionized state to 9–13 μm, resulting in a substantial increase in hardness from HV 213 to HV 410 for the Fe−17Mn steel and from HV 210 to HV 387 for the Fe−17Mn−3Al steel. The elastic modulus values, as evaluated by the nanoindentation technique, increased from (175 ± 11) to (220 ± 12) GPa and from (163 ± 15) to (205 ± 13) GPa for the Fe−17Mn and Fe−17Mn−3Al steels, respectively. The impact energy of the thermomechanically processed austenitic Mn steels was lower than that of the steels in their as-solutionized state. The addition of Al to the Fe−17Mn steel decreased the hardness and elastic modulus but increased the impact energy.

Keywords

austenitic manganese steel (AMS) / thermomechanical processing (TMP) / microstructure / property / hardness / elastic modulus

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