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Consider the following pairs: Heat treatment and Effects on medium carbon steel                   

1. Normalizing: Grain refinement

2. Full annealing: Uniform grain structure

3. Martempering: Decreased ductility

4. Spheroldizing: Maximum softness

Which of the pairs given above are correctly matched?

(a) 1 and 2                      (b) 2 and 3

(c) 3 and 4                      (d) 1, 2, 3 and 4

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