Experienced in Mechanical, Chemical, Metallurgical, And Corrosion Testing
Macroetching (ASTM E340) is the process used on metals and alloys to reveal the macrostructure. The macroetched bars, billets, blooms, and forgings can be rated for their condition using a series of photomacrographs contained in ASTM E340 and ASTM E381.
In forgings the technique is used to examine the Grain Flow to ensure it follow the shape of the part. It is also used to describe certain conditions of macro segregation which are often characteristic of consumable electrode remelted materials (ASTM A604).