If a material's machinability refers to its ability to be easily machined to final shape, would stronger materials possess higher or lower machinability?

• A. Higher
• B. Lower
• C. The same
• D. Unknown

Answer: (B)

Machinability is about how easily a material can be cut to its final shape while keeping tool wear and surface finish acceptable. Stronger materials are typically harder and resist cutting more, so the cutting forces are higher, tool wear increases, and more heat is generated at the cutting interface. These factors make machining more difficult, reducing machinability. So, stronger materials generally have lower machinability. There are exceptions where alloys are designed for good machinability or with optimized tooling and conditions, but the overall trend is lower machinability for stronger materials.