The machining of titanium is difficult due to

Answer: Option B

Machining of titanium and its alloys is considered difficult due to several material-related challenges that affect cutting performance and tool life.

The primary reason is the chemical reactivity of titanium at high temperatures. During machining, the cutting zone experiences extremely high temperatures, and titanium has a strong tendency to react chemically with most cutting tool materials such as carbide or high-speed steel.

This results in welding, diffusion, and adhesion between the tool and the workpiece, causing rapid tool wear, built-up edge formation, and poor surface finish.

Additionally, titanium has a low thermal conductivity, which means heat generated during cutting does not dissipate easily. Most of this heat concentrates at the tool tip, further accelerating wear and reducing tool life.

However, the main factor making titanium machining difficult is the chemical reaction between the tool and the work material, not high thermal conductivity or low contact area.

Therefore, the correct answer is Option B: Chemical reaction between tool and work.