Question:
What structure is formed in the heat affected zone of a medium carbon steel weld due to rapid cooling?
What structure is formed in the heat affected zone of a medium carbon steel weld due to rapid cooling?
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To prevent the formation of martensite and reduce brittleness, controlling the cooling rate during welding is crucial, especially for medium carbon steels.
Updated On: June 02, 2025
- Pearlite
- Ferrite
- Martensite
- Austenite
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The Correct Option is C
Solution and Explanation
Martensite is formed in the heat-affected zone (HAZ) of medium carbon steel when the cooling rate is very rapid, such as during welding. The rapid cooling prevents the formation of pearlite and austenite, causing the material to undergo a phase transformation into martensite, which is a hard and brittle structure.
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