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?

<p>Rapid cooling from the austenite region (D)</p> Signup and view all the answers

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

<p>Fine (A)</p> Signup and view all the answers

What is the phase that transforms to martensite in steel?

<p>Austenite (D)</p> Signup and view all the answers

What is the primary microconstituent in hypoeutectoid steel?

<p>Ferrite (C)</p> Signup and view all the answers

Which microconstituent is harder and more brittle?

<p>Cementite (C)</p> Signup and view all the answers

What is the structure of ferrite?

<p>BCC (C)</p> Signup and view all the answers

What is the carbon content of cementite?

<p>6.67% (D)</p> Signup and view all the answers

What is the microconstituent that consists of fine lamellae?

<p>Pearlite (D)</p> Signup and view all the answers

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

<p>727°C (A)</p> Signup and view all the answers

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

<p>Fe – 0.60% C (D)</p> Signup and view all the answers

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

<p>Pearlite (D)</p> Signup and view all the answers

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

<p>Increase in pearlite and cementite (A)</p> Signup and view all the answers

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

<p>Cementite (A)</p> Signup and view all the answers

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

<p>Proeutectoid ferrite (C)</p> Signup and view all the answers

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

<p>Increases the formation of pearlite (D)</p> Signup and view all the answers

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