Which of the following is the hardest constituent of steel?

• Ledeburite

• Austenite

• Bainite

• Martensite

Iron possesses BCC crystal structure up to (in degree centigrade)?

• 1539

• 768

• 910

• 1410

Iron possesses BCC crystal structure above (in degree centigrade)?

• 1539

• 768

• 910

• 1410

Iron possesses FCC crystal structure above (in degree centigrade)?

• 1539

• 768

• 910

• 1410

Which of the following form of iron is magnetic in nature?

• α

• δ

• γ

• λ

High carbon steels austenize at a slower rate than low carbon steels.

• True

• False

Pearlitic structures with less interlamellar spacing get transformed at a higher rate to austenite.

• True

• False

The kinetics for austenitic transformation for coarse pearlite is slower than that for fine pearlite.

• True

• False

The kinetics for austenite transformation of granular pearlite is higher than that for lamellar pearlite.

• True

• False

Quenched structures transform to austenite at a higher rate than granular pearlite.

• True

• False