Title: Evaluation of surface damage mechanisms and optimisation of cutting parameters in turning of N-155 iron-nickel-base superalloy

Authors: Behnam Davoodi; Behzad Eskandari

Addresses: School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16765-163, Iran ' Department of Manufacturing Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran

Abstract: In this work, surface damage mechanisms generated in turning of N-155 iron-nickel-base superalloy with coated carbide tools were studied. Machined surface of the specimens were precisely examined under scanning electron microscope (SEM), and mechanics of cutting equations were employed to evaluate the cutting condition by measuring the shear strain for each experiment. The experiments were conducted according to L₉ Taguchi standard orthogonal array and cutting speed, feed rate and depth of cut were selected as cutting parameters. The adequate application of signal-to-noise (S/N) quality characteristics as well as analysis of variance (ANOVA) led to determination of the optimal cutting parameters and statistical significance level of each parameter. Experimental results indicated that built-up edge (BUE) and cavity were the predominant surface damage mechanisms. Furthermore, results showed that feed rate was the most effective cutting variable on surface roughness.

Keywords: surface damage mechanisms; mechanics of cutting; optimisation; iron-nickel-base superalloy.

DOI: 10.1504/IJMMM.2019.098070

International Journal of Machining and Machinability of Materials, 2019 Vol.21 No.1/2, pp.100 - 114

Received: 02 May 2018
Accepted: 10 Jun 2018
Published online: 01 Mar 2019 *

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