Fabrication and Processing of Engineering Materials - Annealing Processes - Annealing of Ferrous Alloys

5 important questions on Fabrication and Processing of Engineering Materials - Annealing Processes - Annealing of Ferrous Alloys

Explain what the different phases are in the iron-iron carbide phase diagram.

- The horizontal line A1 is the lower critical temperature. Below this line austentite is transformed into ferrite and cementite phases.
- A3 and Acm are the upper critical temperature lines for hypoeutectoid and hypereutectoid steels. Above these temperatures only the austentite phase exists.

What is normalizing annealing heat treatment used for with ferrous alloys?

After plastic deformations the steel consists of grains of pearlite. Normalizing is used to refine the grains. To decrease them in size.

When is full annealing used?

Often with low- and medium-carbon steels that experience extensive plastic deformation.
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How does full annealing happen?

The steel is heated to 50oC above A3 or A1. Than cooled on the furnace.

When are steels spheroidized?

When medium- or high-carbon steels have such coarse pearlite that they are to hard to plastically deform.

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