Cutting forces and tool wear studies on machining of Hastelloy X

Abstract

Hastelloy based nickel materials are hard to cut category due to their properties like high strength during elevated temperature and excellent stress corrosion resistance. The machinability of such alloy is very much essential during fitment meanwhile tool wear need to be considered with utmost care. This study focused on turning operation of Hastelloy X using different cutting tools under dry conditions with different sets of cutting speeds and feeds. The impact of input cutting conditions on tool wear have been investigated experimentally with three different cutting tools. The turning operation was carried out at two different feeds 0.111 & 0.127 mm/rev and three different cutting speeds 23.86, 37.69 & 57.80 m/min with three different tool inserts. The cutting tool inserts involve an uncoated carbide tool and two coated carbide tools with Titanium Aluminium Nitride (TiAlN) coating and Titanium Nitride (TiN) coating. Optical microscopy and machine vision system were employed to analyze the crater and flank wear. The cutting forces were monitored for different conditions with lathe tool dynamometer. TiAlN coated insert shown better response when compared with other two inserts.