To improve the machinability of steel, it is generally subjected to_______________?
Correct answer: D. Spheroidising
- A. Annealing
- B. Tempering
- C. Normalising
- D. Spheroidising
Explanation
Spheroidising changes lamellar cementite into rounded particles, reducing resistance to cutting and improving machinability, particularly in high-carbon steels. Annealing can also soften steel, but spheroidising is the more specific treatment for this purpose.
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