The mechanical and thermal properties of ferritic–pearlitic ductile irons vary widely according to their silicon and pearlite contents. Thus, different combinations of silicon and pearlite affect components’ lifetime under mechanical and thermal stress. An excellent example of the usage of such irons is combustion engine cylinder heads. They experience transient thermal loading (heating and cooling) during starting and stopping in addition to mechanical loading (combustion) during engine operation. An optimization approach and calculation models for the estimation of the optimal ductile iron composition are presented in this study. The approach allows selection of the most suitable base composition for subsequent analyses, such as casting simulation and final accurate finite element modelling and fatigue calculations.

铁素体-珠光体球墨铸铁的机械和热性能根据其硅和珠光体含量的不同而有很大差异。因此，硅和珠光体的不同组合会影响部件在机械和热应力下的寿命。使用此类熨斗的一个很好的例子是内燃机气缸盖。除了在发动机运行期间的机械负载（燃烧）之外，它们在启动和停止过程中还会经历瞬态热负载（加热和冷却）。提出了估算球墨铸铁最佳成分的优化方法和计算模型。该方法允许选择最合适的基础成分用于后续分析，例如铸造模拟以及最终的精确有限元建模和疲劳计算。