Multiple choice

The ferrite characterised by needle shaped crystallites is

  1. acicular ferrite

  2. ausferrite

  3. martensite

  4. zinc ferrites
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A Correct answer
Explanation

Acicular ferrite is a microstructure of ferrite that is characterised by needle shaped crystallites or grains when viewed in two dimensions. The grains, actually three dimensional in shape, have a thin lenticular shape. This microstructure is advantageous over other microstructures because of its chaotic ordering, which increases toughness.

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