Effect of Cutting Parameters on Microhardness in Turning of AISI 52100 Hardened Alloy Steel with Multilayer Coated Carbide Insert

Abstract

The microhardness (μH) and surface roughness (Ra) constitute the surface integrity aspect, which affects the quality and service life of a product. This paper aimed to analyse the effect of cutting parameters, such as cutting speed, feed and depth of cut on microhardness (μH) in hard turning of AISI 52100 steel of 58 HRC, with multilayer coated carbide tool insert under dry environment. Response surface methodology based on central composite design (CCD) was employed to design the experiment and develop the mathematical models for microhardness (μH). The analysis of variance (ANOVA) was used to explore the main and interaction effect of cutting parameters on microhardness (μH). The (ANOVA) results revealed that the microhardness of the machined surface is significantly influenced by the cutting speed, feed rate and depth. A quadratic regression model in terms of cutting speed, feed and depth of cut for microhardness (μH) was developed with 95% confidence level. The adequacy and validity of the developed model were checked on the basis of P-value, F-value and R2-value.