Page 71 - Handbook of Materials Failure Analysis
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2 Case Studies 65
FIGURE 3.18
Micrograph showing discontinuous grain boundary cracking.
FIGURE 3.19
Micrograph showing ferrite and intergranular grain boundary.
2.2.1.6 Conclusion for case study 2
Hydrogen damage in the plain carbon steel normally occurs in high-heat flux region
in the area of flow disruption such as welded joints with backing rings or protrusions,
bends, or deposits. Hydrogen is caused by operation with low pH water chemistry
from ingress of acidic salts through condenser leakage, contamination from chemical
cleaning or malfunctioning of chemical control components, and concentration of
