Segmental chips are formed during machining a. mild steel b. cast iron c. high speed steel d. high carbon steel

Answer: Segmental chips are formed during machining of materials like high carbon steel. Explanation: Segmental chips are characterized by their curved or segmented shape, with alternating layers of metal and chip material. Such chips are formed when the metal being machined undergoes cyclic stresses that cause the chip to break into segments. This usually occurs in materials that are brittle or have high strength, making them prone to cracking or deformation during cutting. High carbon steel is an example of such material, since it has a high content of carbon which makes it hard, but also causes it to crack under stress. Other materials like mild steel, cast iron, and high-speed steel may also produce segmental chips under certain conditions, but not as commonly as high carbon steel.