Experimental Investigation and Optimization on Abrasive Waterjet Drilling of Inconel -939 Alloy

Abstract

Inconel 939, the nickle-based superalloy has exceptional properties that include its high thermal and mechanical behaviours.  Owing to this properties Inconel 739 demand in various industries like aerospace, automobile. Machining is unavoidable to use Inconel 739 alloys.  Abrasive water jet drilling (AWJD) adopted to analysis and Optimize the MRR (Material Removal Rate) and SR (Surface Roughness) by integrating the RSM (Response Surface Methodology)-CCD (Central Composite Design)-Desirability approach. The L27 Experiments conducted by adopting variation in the Pressure, Traverse Speed, Abrasive Flow Rate and Standoff gap distance. The developed model validated statistically, its suitable for further analysis. Analysis of Variations (ANOVA) illustrations the Pressure was high influential variable in the responses and optimization processes. The developed model of regression shows minimal error between predicted and actual values. Three dimensional plots and used for capture the parameters effect in the responses. Pressure was influencing the 72.7% and 78.8% on SR and MRR Respectively. Desirability approach shows the validation error less than the acceptable limits.