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Q.24 Match the heat treatment processes (Group A) and their associated effects on properties (Group B) of medium carbon steel Group A P: Tempering Q: Quenching R: Annealing S: Normalizing Group B I: Strengthening and grain refinement II: Inducing toughness III: Hardening IV: Softening

1. P-III, Q-IV, R-II, S-I
2. P-II, Q-III, R-IV, S-I
3. P-III, Q-II, R-IV, S-I
4. P-II, Q-III, R-I, S-IV

Correct answer: P-II, Q-III, R-IV, S-I

Solution

Tempering reduces brittleness and enhances toughness after hardening, which is why it is matched with inducing toughness. Quenching is a rapid cooling process that increases hardness, hence its association with hardening. Annealing softens the material, making it easier to work with, while normalizing refines the grain structure, leading to improved strength.

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