Solve this multiple-choice question and choose the correct option.

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Effect of heating on toughness (impact energy capacity) When a metallic material is heated, how does its toughness generally change? Choose the correct trend.

Difficulty: Easy

Increases
Decreases
Remains unchanged
First increases, then decreases

Correct Answer: Increases

Explanation:

ConceptToughness reflects the ability to absorb energy before fracture (area under the stress–strain curve). For most ductile metals, increasing temperature reduces brittleness and increases ductility, so impact energy and toughness rise with heating (within typical service ranges).

Final AnswerIncreases

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