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13.
Analysis of crack formation on a single part glass mould
Tehovnik, Franc ...
The analysis of the formation of longitudinal crack, which appeared on a single part glass mould, is presented in the work. The mould was made from AISI 314 steel, a temperature resistant stainless ...steel. The depth of the longitudinal cracks was approximately 3 mm. The cracks were divided into microcracks at the tip. Chromium and iron oxides were identified as was the presence of both sulphur and calcium. The crack had expanded transcrystalline due to stress corrosion. The fracture surface was gained by propagating existing cracks and shows a transcrystalline fracture due to hydrogen embrittlement. Atomic hydrogen, a product of corrosion, dissolves itself in the austenitic steel matrix at higher temperatures. The effect of hydrogen is so potent that it causes a brittle fracture in steel that is tough even at low temperatures. This kind of corrosion can cause transcrystalline cracks at only 50 % of the yield strength, the cracks are also affected by internal stresses. Even small stresses can cause the formation and advancement of stress corrosion.
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