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Which outcome impedes hydrogen's containment in steel vessels at high temperature?

A)Hydrogen embrittlement reduces fracture toughness
B)Vessel expansion relieves internal pressure
C)Hydrogen forms metallic hydrides rapidly
D)Increased steel conductivity lowers resistance

💡 Explanation

Decreased fracture toughness happens because hydrogen diffuses into the steel lattice, causing hydrogen embrittlement by weakening the metal bonds between iron atoms. Therefore, embrittlement results in cracks forming and propagating much faster than without hydrogen, rather than pressure relief or hydride formation.

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