Title: Optimization study on sliding wear characteristics and heat treatment conditions of different grades of ferritic ductile cast iron

Abstract

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, and 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.

Biography

Bramaramba.v has been a process and mechanical engineer for new product development for aluminium alloy wheels at synergies castings limited for two years. She completed her masters in CAD/CAM specialization. Later she joined as PhD scholar in metallurgical and materials engineering department in national institute of technology Rourkela, India. She is expertise in heat-treatment study, mechanical and physical metallurgy on ductile cast iron and Alsi7mg alloys. She has published three international journals on wear behavior and morphological study on ductile cast iron on different heat treatment processes. Currently, she has written tensile and compression behavior on ductile cast iron on different heat treatments, which will be published in early 2023.