Electrical discharge machining (EDM) is the unconventional machining technique used extensively for machining difficult-to-machine materials with lower material removal rate and poor surface roughness. To overcome these drawbacks, synthetic dielectric fluid is replaced with nanoparticle-infused biodegradable dielectric fluid in the machining of Hastelloy material. This paper focusses on the machining performances of Hastelloy in EDM using various concentrations of 0.5, 1 and 1.5 wt% of nano-zirconia dispersed in biodegradable canola oil methyl ester as the dielectric medium, and these characteristics were compared with those of the synthetic dielectric medium. Based on the D-optimal design coupled with cuckoo search algorithm, machining was carried out with various dielectric fluids and their influences on the metal removal rate, surface roughness, surface morphology and surface topography in EDM studied. The results proved that the canola oil methyl ester containing 0.5 wt% of nano-zirconia (C-0.5) had provided good surface finish, better surface topography, smooth surface morphology and high metal removal rate in comparison with the other dielectric fluids used in this study.

放电加工（EDM）是一种非常规的加工技术，广泛用于加工难以加工的材料，具有较低的材料去除率和较差的表面粗糙度。为了克服这些缺点，在加工哈氏合金材料时，将合成的介电液替换为注入了纳米颗粒的可生物降解的介电液。本文重点研究了哈氏合金在电火花加工中的加工性能，其中使用了分散在可降解芥花籽油甲酯中的各种浓度的0.5、1和1.5 wt％的纳米氧化锆作为电介质，并将这些特性与合成电介质进行了比较。 。基于D最优设计和布谷鸟搜索算法，对各种介电液及其对金属去除率，表面粗糙度，研究了电火花加工的表面形态和表面形貌。结果证明，与用于此的其他介电液相比，含有0.5 wt％的纳米氧化锆（C-0.5）的低芥酸菜子油甲酯具有良好的表面光洁度，更好的表面形貌，光滑的表面形貌和较高的金属去除率。学习。