Properties of Twinning-Induced Plasticity (TWIP) Steel

TWIP steels have a fully austenitic structure at room temperatures due to their high manganese content of 17% to 24%. Deformation twins created in these steels drive a large amount of deformation, providing the name to this class of steels. When the microstructure becomes finer, a high value instantaneous hardening rate (n-value) will be the result of the twinning. The resultant twin boundaries increase the strength of the steel by behaving like grain boundaries. The annealed microstructure for a TWIP steel is illustrated in Figure 1.

Photomicrograph of TWIP steel as annealed.

Figure 1. Photomicrograph of TWIP steel as annealed.

Key Properties of TWIP Steels

TWIP steels exhibit a unique combination of very high stretchability and high strength. There is an increment in the n-value to 0.4 at 30% engineering strain and then there is no change in the n-value until both total and uniform elongation reach 50%. TWIP steels have a tensile strength more than 1000 MPa (Figure 2).

The tensile strength-elongation graph for TWIP steel.

Figure 2. The tensile strength-elongation graph for TWIP steel.

The following table summarizes the current TWIP steel production grades and the corresponding automotive applications:

TWIP 500/900 A-Pillar, wheelhouse, front side member
TWIP 500/980 Wheel, lower control arm, front and rear bumper beams, B-pillar, wheel rim
TWIP 600/900 Floor cross-member, wheelhouse
TWIP 750/1000 Door impact beam
TWIP 950/1200 Door impact beam

Download the Advanced High-Strength Steels Applications Guidelines free here, to learn more about the metallurgy, forming and joining of these new steels.

This information has been sourced, reviewed and adapted from materials provided by WorldAutoSteel (World Auto Steel).

For more information on this source, please visit WorldAutoSteel (World Auto Steel).

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