sábado, 22 de noviembre de 2014

Environmentally induced hydrogen embrittlement

Under the term Environmental Induced Cracking (EIC) a series of subcritical progression cracking processes are involved which result from the synergistic action of a mechanical stress combined with corrosion degradation under service conditions. Such phenomena are designated by the generic term Stress-Corrosion Cracking (SCC).
For many authors, Hydrogen Induced Cracking (HIC) is considered a special case of Stress-Corrosion Cracking, in which the progression of the crack is due to the embrittlement effect caused by the generation and absorption of hydrogen. From IK4-AZTERLAN it is preferred the interpretation of such failures as a particular case of hydrogen embrittlement, wherein the hydrogen source do not come from the manufacturing process, but is generated by a corrosive process in service conditions.