The microstructure and mechanical properties were investigated as a function of the austempering temperature in an Si-rich advanced high-strength steel that is expected to serve for automotive applications. The results indicate that both the size and the morphology of bainitic ferrite vary with the austempering temperature. Incomplete bainite transformation was observed only in a limited temperature range. The strength of the steel is dominated by the ferrite size of the matrix including bainitic ferrite and martensite. The hole expansion capacity exhibits a positive correlation to the C content of retained austenite and a negative correlation to the amount of the retained austenite and the formation of carbides.

研究了作为预计将用于汽车应用的富硅先进高强度钢中奥氏体回火温度的函数的微观结构和机械性能。结果表明，贝氏体铁素体的尺寸和形貌均随奥氏体回火温度而变化。仅在有限的温度范围内观察到不完全贝氏体转变。钢的强度由包括贝氏体铁素体和马氏体在内的基体的铁素体尺寸决定。扩孔能力与残余奥氏体的C含量呈正相关，与残余奥氏体的量和碳化物的形成呈负相关。