Thursday, May 23, 2013

Explain the reason for cracking of brass

In addition to the changes in physical and chemical properties, internal stress, often of a very high intensity, may be left in the object after cold deformation.

Metals such as brass with internal stresses appearing after working is susceptible to inter-crystalline corrosion. If it is stored for a long period. This leads to disintegration or failure of the metal. This phenomenon is called season cracking, or more correctly stress corrosion cracking. Development of cracks is accelerated by reaction with corrosive medium and the cracks go round the grains, i.e. they inter-crystalline. This defect is overcome by annealing the brass at about 300 degree C.

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