What is descriptive of the annealing process of steel during and after it has been annealed?

• A. Rapid cooling; high strength
• B. Slow cooling; low strength
• C. Slow cooling; increased resistance to wear
• D. Rapid cooling; reduced brittleness

Answer: (B)

Annealing softens steel by heating it to a high temperature and then letting it cool slowly. This slow cooling allows the microstructure to recrystallize and relieve internal stresses, producing a material that is more ductile and easier to work with, with lower hardness and strength than before annealing. That’s why slow cooling paired with lower strength best describes the annealed state. Rapid cooling, as in quenching, would produce a hard, brittle structure; slow cooling accompanied by increased wear resistance would imply higher hardness, which is not the goal of annealing; and rapid cooling with reduced brittleness does not fit the typical outcome of the annealing process.