Microstructure characterization of high Mn-Al steel after hot compression tests

Abstract

In last year’s numerous research centres have been focused to the development of Mn-Al belong to the novel AHSS steels for the automotive and railway industry. The X55MnAl25-5 high manganese steel belong to these group demonstrate a dominant stress mechanism known as Twining Induced Plasticity (TWIP), which occurred as a main mechanism of plastic deformation, strongly dependent on Stacking Fault Energy (SFE). Moreover, these steels reveal a high yield stress and very high total elongation from. Properties of these steels predispose it to be used as constructional elements in automobile industry, which are characterized by a great energy reserve, absorbed during plastic deformation (vehicle collision) and high rigidity. This paper presents the results of applied methods of SEM/EBSD techniques for characterize the structure of high manganese steel after deformation by compression tests, with various deformation parameters like temperature and strain rate. Applied methods revealed the influence of deformation parameters on grain size, fraction of twinned grains and misorientation angles. The obtained results can be used for the development of this steels and their plastic deformation models.