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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?

Due to its metastable nature Signup and view all the answers

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

TTT diagram Signup and view all the answers

What happens to the TTT diagram when Mn is added?

It splits into two sections Signup and view all the answers

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

CCT diagram Signup and view all the answers

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

Continuous cooling conditions 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?

Overall transformation rate Signup and view all the answers

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

CCT transformation Signup and view all the answers