Welder Red Seal · Question
What rapid cooling process is responsible for the formation of martensite, a very hard and brittle microstructure, in the heat-affected zone (HAZ) of a carbon steel weld?
Quenching is the rapid cooling of a metal, which traps carbon in the steel's crystal structure, resulting in the formation of hard and brittle martensite. This
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Question: What rapid cooling process is responsible for the formation of martensite, a very hard and brittle microstructure, in the heat-affected zone (HAZ) of a carbon steel weld?
Answer options:
- Annealing
- Normalizing ✅ Quenching
- Tempering
Correct answer: Quenching
Explanation: Quenching is the rapid cooling of a metal, which traps carbon in the steel's crystal structure, resulting in the formation of hard and brittle martensite. This can occur naturally in the HAZ when welding thicker materials without preheat.
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