International Journal of Applied Engineering Research ISSN 0973-4562 Volume 10, Number 2 (2015) pp. 4191-4200 © Research India Publications http://www.ripublication.com Study on Surface Integrity of High Speed Turning of Inconel 718 Using Taguchi DOE Approach Dr.M.Nataraj 1 , M.Ramamoorthy 2* , Dr. M.Pradeep Kumar 3 1 Associate Professor, Government College of Technology, Coimbatore, India 2 Research Scholar, Anna University, Chennai, India 3 Associate Professor, Anna University, Chennai, India 1 m_natanuragct@yahoo.com, 2 ramus04_me@yahoo.co.in, 3 pradeep@annauniv.edu Abstract In High Speed Machining Processes, a major quality related output is surface roughness of the machined surfaces. Machining of the difficult-to-cut materials under high speed machining conditions results a drastic decrease in tool-life. Huge cutting force and higher cut edge temperature leads to poor surface finish. An attempt has been made in this paper to study the influence of cutting parameters on surface integrity of Inconel 718 nickel based super alloy under cryogenic cooling conditions during high speed machining. Experiments were carried out using Taguchi‟s L 18 mixed orthogonal array based quality design concept to arrive the best optimal parametric combination by varying the cutting speed, feed, depth of cut, tool nose radius, air / LN 2 pressure and the head level of LN 2 in the cryocan. Analysis of variance (ANOVA) was done to find out the significance of the machining parameters while machining Inconel 718. Confirmation experiments were conducted to validate the experimental investigation. Keywords: Cryogenic cooling, cryocan, surface integrity, Inconel 718, DoE, Orthogonal Array Introduction Nowadays manufacturing industries are facing challenges in enhancing the surface integrity along with increased productivity of the machined parts particularly for the heat resistant super-alloys that are employed in aerospace applications. Machining super-alloys to the desired configuration continues to be a challenge in the shop-floor. Researchers have been focusing on such challenges to come up with innovative solutions [1]. Surface qualities of the machined components are being characterized by the degree of roughness and metallurgical damage which are together termed as „surface integrity‟. Surface integrity had significant influence on the surface sensitive