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Mechanical Properties of Fe-C Alloys

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Questions and Answers

What is the minimum percentage of carbon in steel for the formation of BCT martensite?

0.5%

2.0%

1.0%

0.2% (correct)

What is the structure of martensite in steels with less than 0.2% carbon?

HCP

BCC (correct)

BCT

FCC

Why is martensite in steels very hard and brittle?

It has no closed packed slip planes (correct)

It has a large grain size

It has a high percentage of carbon

It has a low percentage of carbon

What is required to prevent the formation of pearlite in steel?

Rapid cooling from the austenite region Signup and view all the answers

What is the characteristic of the grain size of martensite in steels?

Fine Signup and view all the answers

What is the phase that transforms to martensite in steel?

Austenite Signup and view all the answers

What is the primary microconstituent in hypoeutectoid steel?

Ferrite Signup and view all the answers

Which microconstituent is harder and more brittle?

Cementite Signup and view all the answers

What is the structure of ferrite?

BCC Signup and view all the answers

What is the carbon content of cementite?

6.67% Signup and view all the answers

What is the microconstituent that consists of fine lamellae?

Pearlite Signup and view all the answers

What is the temperature at which the eutectoid transformation occurs in the Fe-C system?

727°C Signup and view all the answers

What is the composition of the alloy at 726°C?

Fe – 0.60% C Signup and view all the answers

What is the microconstituent that forms at the grain boundary of austenite?

Pearlite Signup and view all the answers

What is the result of increasing the C content in a hypereutectoid steel alloy?

Increase in pearlite and cementite Signup and view all the answers

What is the name of the microconstituent that forms at 1148°C in the Fe-C system?

Cementite Signup and view all the answers

What is the term for the microconstituent that forms below 726°C in the Fe-C system?

Proeutectoid ferrite Signup and view all the answers

What is the effect of undercooling on the microconstituents in a hypereutectoid steel alloy?

Increases the formation of pearlite Signup and view all the answers