Surface integrity analysis of machined Inconel 718 over multiple length scales

High performance cutting of advanced aerospace alloys and composite materials

“…Al 2 O 3 usually whisker reinforcement such as SiC), being utilised at high cutting speeds (v c > 200m/min) [2,13,60,155] and commonly with negative edge geometry, resulting in high temperatures at tool-workpiece interface, are mainly employed for continuous (e.g. turning) roughing to allow finishing operations to remove any possible metallurgical alterations that might be caused during this process; (iv) polycrystalline Cubic Boron Nitride (PCBN), with its high hardness, requiring high cutting speeds (200 m/min < v c < 500 m/ min), was reported for finishing operations [6,43,106,149].…”

Transmission Kikuchi Diffraction study of texture and orientation development in nanostructured hard turning layers

“…Due to the extremely small grain size (<30 nm) and high density of lattice defects in the martensitic structure, orientation and texture studies on hard turning layers have not been conducted. More recently Guo et al [3] and M'Saoubi et al [4] conducted orientation and texture studies of machining non-ferrous alloys. However, due to the limited spatial resolution of the Electron Backscatter Diffraction (EBSD) technique, the authors were not able to study grain sizes smaller than 100 nm.…”

Performance and wear mechanisms of whisker-reinforced alumina, coated and uncoated PCBN tools when high-speed turning aged Inconel 718

“…Attempts on application of PCBN tools has been made in 1990-th but available PCBN material had high cBN content (90-95%) with metallic or ceramic (AlN, AlB 2 ) binder and the cutting speed for such tools was limited to 90-120 m/min [5]. Recent developments in the PCBN materials related to optimization of cBN content and a type of binder have led to extension of cutting speed range to 200-300 m/min for turning Inconel 718 [6,7]. Performance of PCBN tools when machining other Ni-based superalloys has also been subjected to study [8,9].…”