ABSTRACT
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The outstanding importance of steels in engineering is based on their ability to change
mechanical properties over a wide range when subjected to controlled heat treatment. For
unalloyed carbon steels, for example, the hardness can be increased by up to 500% just by
changing the cooling rate from the austenitizing temperature from extremely slow to
extremely fast. However quenching at a rate faster than in still air does not only determine
the desired mechanical properties but is an important side effect of quenching is the formation
of thermal and transformational stresses that lead to changes in size and shape and thus may
result in quenching cracks that damage the workpiece.
