MECHANICAL PROPERTIES AND AUSTENITE STABILITY OF CMnSiAlCu COLD ROLLED TRIP-AIDED STEEL SHEETS

摘要

Though Si has been utilized as a major alloying element in low-alloyed TRIP-aided steels, high Si content (>lwt percent) significantly deteriorated galvanizing property caused by the presence of complex oxides formed during heat treatment. A partial or complete substitution of silicon by other alloying elements has been the main research activities for improvement of both in surface quality and mechanical properties. In the present work, the effects of Si replacement with Al and Cu addition on mechanical properties and microstructures were investigated. Replacement of Si with Al resulted in enhanced ductility due to the improved mechanical stability of retained austenite with sacrifice of strengths. The low strength of Al added TRIP steel could be partly compensated by Cu addition with a little decrease in uniform elongation.