AMIE Exam Lectures- Materials Science | Different Types of Metal Alloys | 11.2

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AMIE Exam Lectures- Materials Science | Metal Alloys | Different Types of Metal Alloys | 11.2

Introduction - :
Previous Lecture - Different Types of Metal Alloys with carbon is less than 2.1%
Present Lecture - Different Types of Metal Alloys with carbon is greater than  2.1%

Cast Iron - :
- Where C greater than 2.1%
- Low melting point

Types of Cast Iron - ;
- Gray
- Nodular
- White
- Malleable

Gray Cast Iron - :
- C 2.5% - 4%
- Flakes of graphite surrounded by ferrite matrix
- Weak and Brittle under tension
- Least Expensive

Nodular (Ductile) Cast Iron
- Small amount of Mg or Ce added to gray cast iron
- Matrix is pearlite or ferrite

White Cast Iron
- Very Hard and Brittle
- Used in rollers in mills

Malleable Cast Iron - :
- Cementite decomposes to graphite
- High strenth and good ductility

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