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Título del libro: Proceedings Of The 2008 International Hydrogen Conference - Effects Of Hydrogen On Materials
Título del capítulo: Hydrogen sour environments conditions for microalloyed pipeline steels cracking

Autores UNAM:
BERNARDO FABIAN CAMPILLO ILLANES;
Autores externos:

Idioma:

Año de publicación:
2009
Palabras clave:

Crack growth; Hydrogen evolved; Microalloyed steel; NaCl-H2S concentrations; Sour environment conditions


Resumen:

Microalloyed pipeline steels were evaluated varying the concentration of H2S by means of hydrogen embrittlement tests at room temperature and 50 °C, using Linear Elastic Fracture Mechanics MWOL (Modified Wedge Open Loading) specimens to measure its cracking susceptibility and propagation. H2S concentration was found to be an important factor that controlled the extent of hydrogen uptake and embrittlement at crack tips. Threshold stress intensities (KIth) were obtained for each condition, and the optimal H2S concentration for minimizing the risk of hydrogen embrittlement as a byproduct of corrosion was established. The different steels microstructural features such as, grain boundaries shape, dislocations, and precipitation distribution proved to play an important role for the cracking susceptibility of these microalloyed steels, being more remarkable at room temperature. Copyright © 2009 ASM International® All rights reserved.


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