Abstract
The tensile mechanical performance of different low-alloy TRIP steels has been evaluated with regard to material design requirements in the automotive industry. Experimental results obtained for variations in chemical composition and for different bainite holding heat treatment conditions in low-alloy TRIP steels were exploited. Both laboratory scale and commercially produced TRIP steels were investigated. For the evaluation of the mechanical performance, the quality index QD has been introduced. The index QD considers the combination of tensile strength and strain energy density in a single value. Quality characterization and alloy quality ranking were made using the index QD as well as, for comparison, the quality index QB = Rm·Ag, which is currently used by the industry. The results obtained involving the index QD seem to be more realistic, from the viewpoint of automotive design requirements.
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