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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2006

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Modelling of the DP and TRIP micro-structure in the CMnAlSi automotive steel

Lis A. K., Gajda B.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 15, nr 1-2

127--134

Purpose: The CMnAlSi steel is a new grade of TRIP steels with 1wt % of Al and Si. It is important to determine the usability of the CMnAlSi for production of sheets for automotive applications. Design/methodology/approach: The effect of cooling rate and austenitization temperature on phase transformations was investigated. The dilatometric experiments of the steel were done for the full austenitization temperature 1200°C, and for (α+γ) temperature ranges: 1100°C, 1000°C, 900°C and 800°C. Steel was also processed to achieve TRIP grade by continuous annealing with modeled vertical hot dip galvanizing line. The microstructures were investigated by light optical microscopy and SEM with EDX attachment. The amount of retained austenite in the obtained microstructures was investigated with X-ray diffraction. Findings: There is possibility to produce “dual-phase” CMnAlSi steel grade with controlled rolling at finishing temperature below 900°C to 800°C and fast cooling. Steel CMnAlSi is well suited for production of TRIP grade via heating cycle which correspond to vertical hot dip galvanizing process. Practical implications: This steel is suitable for production of automotive applications. Originality/value: The new procedure of control rolling from the (α+γ) temperature range of CMnAlSi steel was presented.