Engineering Board Exam Reviewer · Engineering Materials · medium

The diagram that shows the time needed for austenite to transform at a constant temperature is the:

1. TTT (time–temperature–transformation) diagram
2. Iron–carbon phase diagram
3. S–N diagram
4. Stress–strain diagram

Answer

A. TTT (time–temperature–transformation) diagram

Solution

Also called the isothermal transformation (IT) diagram.

More Engineering Materials questions

1. Reheating quenched (martensitic) steel to a temperature below the eutectoid temperature to reduce brittleness is called:
2. Rapid cooling of steel from the austenite region in water, oil or brine is called:
3. Heating steel into the austenite region and cooling it in still air is called:
4. Heating steel into the austenite region and cooling it slowly in the furnace is called:
5. A steel with less than 0.76% carbon is called a:
6. The very hard, brittle microconstituent formed by rapidly quenching austenite is:
7. The lamellar mixture of ferrite and cementite formed by the eutectoid reaction in steel is called:
8. The BCC phase of iron (α-iron) at room temperature is called:
9. Iron carbide ( Fe3C) is also called:
10. The eutectic composition in the iron–iron carbide system is approximately:

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