Abstract
Current research discusses the experimentation on WEDM of combustor material (i.e. nimonic 263) with varying pulse-on time (Ton), pulse-off time (Toff), peak current (Ip) and spark gap voltage (Sv). The influence of parameters is evaluated on the basis of material removal rate (MRR) and surface roughness (SR). Experimental runs are designed according to user-defined RSM. 81 experiments are executed under different parametric conditions. RSM based desirability approach is applied to find out the optimal parameters for maximizing MRR and minimize Sr After that, experimental results are utilized to train the neural network. Furthermore, microstructure changes and composition of WEDMed surface is assessed by FE-SEM. It is observed that WEDMed surfaces contain micro-cracks, craters, spherical droplets and lump of debris. In addition, the mechanism of recast layer formation and microhardness of machined surfaces are critically evaluated to apprehend better understanding of the technique. Furthermore, polishing was considered as a post-processing technique for removing the RLT. The key features of experimental procedure are also highlighted in this paper.
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