The Influence of the Substitution of Si by Al on the Properties of Cold Rolled C-Mn-Si TRIP Steels

摘要

The effect of the substitution of silicon by aluminium on the mechanical properties and the microstructure of cold rolled C-Mn-Si TRIP steels was investigated for different continuous annearling cycles. The mechanical properties were evaluated using tensile testing. It was seen that the Al alloyed steel had very good mechanical properties with an improved formability compared to the convectional C-Mn-Si TRIP steel. The strain hardening behaviour was studied in detail. All the investigated specimens showed a very high n value but their strain dependence was different. For the conventional C-Mn-Si TRIP steel the maximum n value was reached at low strain, while the Al substituted TRIP steel showed a gradual increase of the value .The l. The latter effect resulted in a larger uniform elongation for the C-Mn-Al-Si TRIP steel.