Engineering Subjects: Material Science and Engineering:
Material Science | Material Design - Part 4 | Martensite | What is Martensite transformation | 9.4
Introduction - :
Previous Lecture - CCT Diagrams
Present Lecture - Martensitic Transformation
Martensitic Transformation - : It is formed by diffusionless transformation of austenite.
- Rapid quenching to low temperature
- supersaturated with carbon
- Instantaneous Transformation
Lower the temperature more the Martensite
There is no martensite finish line, means we can never get 100% of martensite formation.
Retained Austenite - Austenite remains in conversations is known as Retained Austernite.
By seeing the cooling curve, we can decide the schedule which needs to be followed, which gives different microstructure. Different phases of the material.
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Bainite has upper (high temperature) and lower bainite (low temperature) structure depending on the temperature. We have not discussed the structure in any details in this series of lectures.
Study of bainite is quite comprehensive and in fact there are competing school of thoughts; some scientists think that bainite formation is diffusive in nature (as i mentioned) but many other scientist believe it is displacive (diffusionless). There are experimental evidence supporting both mechanisms, therefore bainite is still a subject of much debate in the scientific community. I tried to avoid going into the details and just wanted to introduce the basic concepts.
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No it will not .Pearlite is a stable phase .It wont change into martensite bcz the structure has already undergo diffusion to form lamellar structure .It doesnt need to change its phase since its the most stable with minimum free energy .Same goes for Bainite also , once it forms , it will retain .
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