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Structure and mechanical properties of newly-developed high-strength TRIPLEX type steels DOI:10.15199/28.2018.5.4

  1. INTRODUCTION High-manganese steels belong to the high-strength AHSS group steels (Advanced High Strength Steels) of the second generation, are characterised by a good combination of strength and plastic properties. Fe-Mn-Al-C steels (TRIPLEX type) belong to the group of high manganese steels of different participating in the structure of the three phases: austenite, ferrite and carbides, including those responsible for very good mechanical properties of these dispersion steels of κ-(Fe, Mn)3AlC carbides [1÷15]. Nano-sized carbides type M3C — (Fe, Mn)3AlC (so-called κ carbides) precipitation in this type of steels is affected by the addition of Al greater than 5% [1÷4]. These carbides shape the strength properties of this group of steels. The mechanical properties of these steels are determined to a large extent by the location, dimensions, coherence with the matrix as well as the morphology of κ-(Fe, Mn)3AlC carbides. κ carbides can also cause the appearance of the brittleness of steel during plastic deformation at room temperature when they are formed at grain boundaries as large precipitates [1÷10, 14÷17]. Due to the relatively high addition of Al ~11%, as well as Mn (18÷28%) and C (0.5÷1.2%), metallurgy, processing, microstructure and deformation mechanisms of these steels are significantly different from those in traditional structural steels. These steels are characterised by 15% lower density compared to conventional structural steels (Fig. 1), making them very attractive from the point of view of their use in structural elements. Addition of Al to steel with a high content of Mn affects two important effects: increasing the stacking fault energy and the precipitation of κ-(Fe, Mn)3AlC carbide. The dominant mechanisms in Fe-Mn-Al-C steels include: microband induced plasticity (MBIP), dynamic slip band refinement (DSBR), shear band induced plasticity (SIP), transformation induced plasticit[...]

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