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The process of reheating martensitic steel to reduce its brittleness without any significant loss in hardness is

1. normalising
2. annealing
3. quenching
4. tempering

Correct answer: tempering

Solution

Tempering is the process of reheating quenched martensitic steel below the critical temperature to reduce brittleness and relieve internal stresses. It improves toughness with only a small reduction in hardness.

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