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Isothermal transformation of austenite at temperatures between those forming pearlite and martensite produces:

1. Ferrite
2. Ledeburite
3. Bainite
4. Spheroidite

Answer

C. Bainite

Solution

Austempering produces bainite, combining good strength and toughness.

More Engineering Materials questions

1. The ability of a steel to be hardened to a depth by quenching is called:
2. The diagram that shows the time needed for austenite to transform at a constant temperature is the:
3. Reheating quenched (martensitic) steel to a temperature below the eutectoid temperature to reduce brittleness is called:
4. Rapid cooling of steel from the austenite region in water, oil or brine is called:
5. Heating steel into the austenite region and cooling it in still air is called:
6. Heating steel into the austenite region and cooling it slowly in the furnace is called:
7. A steel with less than 0.76% carbon is called a:
8. The very hard, brittle microconstituent formed by rapidly quenching austenite is:
9. The lamellar mixture of ferrite and cementite formed by the eutectoid reaction in steel is called:
10. The BCC phase of iron (α-iron) at room temperature is called:

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