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Influence of Recast Layer on the Fatigue Life of Ti6Al4V Processed by Electric Discharge Machining

Eakambaram A., Xavior M. A.

Archives of Metallurgy and Materials

2019

Vol. 64, iss. 4

1541--1548

In this research work, Ti6Al4V alloy material was subjected to electric discharge machining (EDM) and its fatigue life was investigated at low cycle fatigue mode. In order to evaluate the influence of recast layer generated during the machining process on the fatigue life, samples prepared using end milling process were also subjected to similar tests and a comparative analysisis presented. Data were observed in the fully reversed fatigue mode at room temperature using samples fabricated as per ASTM standard E606. The specimen were machined on a spark electric discharge die sink machine which were subjected to fatigue, and the recorded fatigue lives were compared with the fatigue life of end milled specimen. The machined surfaces were examined through optical and scanning electron microscopes, and the roughness was measured with a standard profilometer. It was observed that when the discharge current is augmented, the recast layer formed was in the range of 20 to 70 μm thick. From the results, it is being concluded that fatigue life of the samples fabricated by EDM is less for various load conditions when compared with that of the end milled sample. The milled sample at 160 MPa load exhibited 2.71×105 cycles, which is 64% more when compared to EDM sample.

Evaluating the machinability of AISI 304 stainless steel using alumina inserts

Xavior M A

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 2

841--847

AISI 304 austenitic stainless steel is generally regarded as difficult to machine steels on account of their high strength, high work hardening tendency and poor thermal conductivity. The machinability of AISI 304 was investigated by some researchers using uncoated and coated carbide inserts, but its machinability using advanced cutting inserts like alumina was not explored adequately. Therefore, in this paper the machinability of AISI 304 is being evaluated by machining (CNC turning process) the work material using alumina inserts. The machinability is evaluated in terms of surface finish achieved on the work piece, tool wear encountered and tool life achieved by the inserts for various machining time and the cutting zone temperature generated during the process.