Mechanical Properties of Fe-C Alloys
18 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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</p> Signup and view all the answers

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

    <p>Fine</p> Signup and view all the answers

    What is the phase that transforms to martensite in steel?

    <p>Austenite</p> Signup and view all the answers

    What is the primary microconstituent in hypoeutectoid steel?

    <p>Ferrite</p> Signup and view all the answers

    Which microconstituent is harder and more brittle?

    <p>Cementite</p> Signup and view all the answers

    What is the structure of ferrite?

    <p>BCC</p> Signup and view all the answers

    What is the carbon content of cementite?

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

    What is the microconstituent that consists of fine lamellae?

    <p>Pearlite</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</p> Signup and view all the answers

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

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

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

    <p>Pearlite</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</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</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</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</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser