Surface cracking occurring at low temperatures in hydrostatic extrusion is known as

Explanation:

• During hydrostatic extrusion surface cracking may also occur at low temperatures and has been attributed to periodic sticking of the extruded product along with the die land (stick-slip) at the time of extrusion.
• In case the product that is being extruded sticks to the die land, then the extrusion pressure increases rapidly, then shortly thereafter the product moves forward again and the pressure gets released.
• The cycle is then repeated as a result, the bamboo-like appearance is observed.
• This defect is thus known as Bamboo Defect.