What type of metallurgical failure does Item 1 represent in the illustration? see Illustration GT-0038 Illustration GT-0038: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option B — Radial cracking.

Radial cracking in turbine components typically originates at the blade root or cooling holes, propagating outward toward the tip. This failure mode is driven by high-cycle fatigue and thermal stress gradients common in high-pressure turbine sections, necessitating immediate inspection to prevent catastrophic blade liberation during high-speed operation.