Heat Treatment of Metals

Front

Heat treatment involves heating and cooling metals to change their properties.

Back

This process alters the physical and sometimes chemical properties of the metal.

Front

The three stages of heat treatment are heating, soaking, and cooling.

Back

These stages are crucial for achieving the desired metal properties.

Front

Heating metal must be done slowly and evenly to avoid cracking.

Back

Rapid heating can lead to thermal stress and cracking.

Front

Soaking involves holding metal at a specific temperature for a set period.

Back

This allows for uniform temperature distribution throughout the metal.

Front

Cooling can be done quickly by quenching in water, oil, or other liquids.

Back

Quenching can increase hardness but may also introduce brittleness.

Front

Purpose of normalising steel.

Back

Normalising refines the internal grain, giving the metal a stable and uniform structure, relieving internal stress.

Front

Process of hardening metal.

Back

Hardening involves heating metal and quickly cooling it in oil or water to make it hard.

Front

Effect of hardening on steel.

Back

Hardening can make steel very hard but may increase brittleness.

Front

Purpose of tempering after hardening.

Back

Tempering reduces hardness to increase toughness, balancing hardness and toughness.

Front

Result of successful tempering.

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A good balance between hardness and toughness is achieved.