Most of the information available is based on observations made during commercial production of titanium components in the aerospace industry. Titanium alloys are used widely where the strength-to-weight ratio and corrosion resistance are of the utmost importance. These alloys have been classified as 'difficult-to-machine' materials. Research work has been carried out to determine the temperature field in the cutting zone of titanium alloy Ti6Al4V during high speed milling. In the present work, uncoated cemented carbide tools were used in the milling of Ti6Al4V. The experiments were carried out under dry cutting conditions. Tests were performed on a Mikron 18000 rpm high speed machining centre and temperatures were measured using the implanted workpiece thermocouple techniques.

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Shot peening is known to improve the fatigue performance of materials. The improvement in fatigue is that plastic deformation in the surface increases hardness, yield stress and microstrain of thinning Crystal block and dislocation density, and formed advantaged compress residual stress that are introduced into the near-surface of the components and which hinder crack initiation and growth. But over peening effect is produced when shot peening strengthening goes beyond a certain limit, which was adverse to improve surface quality. This paper adopted the optimization of the critical peening parameters to avoid appearing over peening effect. The experimental result showed that arc high value of optimal shot peening was 0.40mm.

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