Dual-phase steel

High school (ages 12+)
Science & Technology

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/dual-phase-steel

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the scientific name?Dual-phase steel (DP steel)
2. What is the origin?Developed in 2007 by Tata Steel
3. Why do cars use dual-phase steel?Cars use dual-phase steel because it is strong enough to protect people in crashes, yet light enough to help cars use less fuel. It can bend and absorb energy safely.
4. How is dual-phase steel made?It is made by heating low‑carbon steel that contains manganese, silicon, chromium, and molybdenum, then cooling it quickly. This process creates the soft ferrite and hard martensite inside the steel.

Microstructure: The microscopic arrangement of phases and grains within a material, dictating its properties.
Ferrite: A body-centered cubic (BCC) allotrope of iron, characterized by its softness and ductility.
Martensite: A very hard, brittle phase formed by rapid quenching of austenite, containing dissolved carbon.
Austenite: A face-centered cubic (FCC) allotrope of iron, stable at higher temperatures, capable of dissolving more carbon.