The present work reports an experimental investigation on influence of microstructures on dry sliding wear performance of different grades of ferritic ductile iron. Ductile cast iron samples of ferritic grade have been subjected to different heat-treatment processes at different temperatures and times. Taguchi optimization technique (L₁₆) has been applied to evaluate the influence of different process variables (load, time, heat treatment, and grade) during ball-on-plate wear test. Meanwhile, analysis of variance (ANOVA) method was adopted to know the significance of aforesaid process variables. ANOVA results confirmed that the heat-treatment process has highest significance (54.76%) within all process variables. Among heat-treated specimens, austempered samples have outstanding wear resistance while the DMS samples have lower wear resistance. In addition, overall utility values have been evaluated by using individual utility values of weight loss and hardness. An obtained overall utility value gives the optimum combination for achieving higher wear resistance and hardness. Additionally, morphology of wear surfaces was examined in scanning electron microscope and the micrographs confirm the existence of inferior surface in terms of abrasive wear, adhesive wear, particle pullout and delaminated sheets on wear track. Enrichment of oxygen element has been observed on the worn path through energy-dispersive X-ray spectroscopy. X-ray diffraction analysis confirms the existence of different compounds like iron and silicon oxides on the wear track surface which may improve its hardness.

本工作报告了对不同等级的铁素体球墨铸铁的微观结构对干滑动磨损性能影响的实验研究。铁素体等级的球墨铸铁样品已在不同的温度和时间经受了不同的热处理工艺。田口优化技术（L ₁₆）已用于评估板对球磨损试验中不同工艺变量（负载，时间，热处理和等级）的影响。同时，采用方差分析法（ANOVA）来了解上述过程变量的重要性。方差分析结果证实，在所有工艺变量中，热处理工艺的重要性最高（54.76％）。在热处理样品中，奥氏体样品具有出色的耐磨性，而DMS样品具有较低的耐磨性。另外，已经通过使用重量损失和硬度的各个实用价值来评估总体实用价值。获得的总实用价值为实现更高的耐磨性和硬度提供了最佳的组合。另外，在扫描电子显微镜下检查了磨损表面的形貌，并且显微照片证实了在磨损轨道上存在下表面的磨料磨损，粘着剂磨损，颗粒拉出和分层。通过能量色散X射线光谱法在磨损路径上观察到了氧元素的富集。X射线衍射分析证实，磨损道表面上存在不同的化合物，如铁和氧化硅，可以提高其硬度。