Season Cracking
Brass is susceptible to stress corrosion cracking, especially from ammonia or substances containing or releasing ammonia. The problem is sometimes known as season cracking after it was first discovered in brass cartridge cases used for rifle ammunition during the 1920s in the Indian Army. The problem was caused by high residual stresses from cold forming of the cases during manufacture, together with chemical attack from traces of ammonia in the atmosphere. The cartridges were stored in stables and the ammonia concentration rose during the hot summer months, so initiating brittle cracks. The problem was resolved by annealing the cases, and storing the cartridges elsewhere.
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Famous quotes containing the words season and/or cracking:
“Hence in a season of calm weather
Though inland far we be,
Our Souls have sight of that immortal sea
Which brought us hither,”
—William Wordsworth (1770–1850)
“All round and round does the world lie as in a sharp-shooter’s ambush, to pick off the beautiful illusions of youth, by the pitiless cracking rifles of the realities of age.”
—Herman Melville (1819–1891)