Effect of EDM and milling on high cycle fatigue life of Ti-6Al-4V alloy specimen
DOI:
https://doi.org/10.58368/MTT.23.1-2.2024.1-8Keywords:
Milling, EDM, Surface Integrity, Notch-Fatigue Life, Titanium AlloyAbstract
Several advanced machining processes are being used in aerospace industry for manufacturing of critical components of titanium and nickel based superalloys. Typically, any machining process imparts surface and sub-surface damage to the component. Such surface damage can potentially cause premature failure of a component during its use. The present experimental study aims to understand the induced damages caused during milling and electro-discharge machining (EDM), and their impact on high cycle fatigue (HCF) life of flat notch specimen of Ti-6Al-4V alloy. These specimens were investigated for machining damage and it was found that milling causes grain deformations and marginal decrease in micro-hardness near the machined area. EDM, on the other hand produces significantly higher surface damages which includes high surface roughness, networks of fine cracks, recast layer, heat affected zone and phase transformation. Due to these damages, EDM specimens exhibited appreciably lower HCF life than milled specimens.
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