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Nucleation and Growth in Metallurgical Engineering
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Nucleation and Growth in Metallurgical Engineering

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Questions and Answers

What is the term used to describe the transformation of austenite-martensite without the need for diffusion or thermal activation?

  • Athermal transformation (correct)
  • Austenitic transformation
  • Annealing transformation
  • Isothermal transformation
  • What is the crystal structure of martensite after the transformation from FCC -Fe (austenite)?

  • Orthorhombic
  • Body Centered Tetragonal (BCT) (correct)
  • Hexagonal
  • Cubic
  • Why does martensite transform to equilibrium phases when annealed at an elevated temperature?

  • To decrease its brittleness
  • To reach a stable state (correct)
  • To enhance its metastability
  • To increase its hardness
  • Why does martensite not appear in the Fe-C phase diagram?

    <p>Due to its metastable nature</p> Signup and view all the answers

    Which diagram can be influenced by the addition of alloying elements such as Mn?

    <p>TTT diagram</p> Signup and view all the answers

    What happens to the TTT diagram when Mn is added?

    <p>It splits into two sections</p> Signup and view all the answers

    What is the name of the diagram that represents the overall transformation rate as a function of time?

    <p>CCT diagram</p> Signup and view all the answers

    In normal industrial practice, under what conditions do transformations typically take place?

    <p>Continuous cooling conditions</p> Signup and view all the answers

    What term is used to describe the transformation rate that is the product of nucleation rate and growth rate?

    <p>Overall transformation rate</p> Signup and view all the answers

    What is the term used to describe the transformation that takes place under continuous cooling conditions?

    <p>CCT transformation</p> Signup and view all the answers

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