TRIP steel with reduced silicon content

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Abstract
At present high strength thin sheet steel grades are gaining considerable market shares due to the intensified application in the automotive industry. Although several new high strength steels for cold forming have been developed and continuously improved for some decades there is still a necessity to increase the formability at a given high strength level. TRIP steels are a consistent further step to meet these requirements. Most of the published work concentrates on compositions with high C, Mn and Si contents which causes problems during production. Therefore in this work TRIP steels with reduced C and Si contents were produced and the influence of the annealing parameters on the microstructure and mechanical properties was investigated in detail for production via continuous annealing lines. Based on these investigations optimized heat cycles were proposed.