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← ScienceWhich consequence results when high hydrogen partial pressure degrades steel?
A)Reduced material fracture toughness values✓
B)Increased yield strength at grain boundaries
C)Improved oxidation resistance at temperatures
D)Enhanced uniform stress distribution matrix
💡 Explanation
Hydrogen embrittlement weakens steel because hydrogen atoms diffuse into the metal lattice, causing **decohesion** along grain boundaries; therefore, the fracture toughness decreases rather than increases. This effect accelerates cracking under mechanical stress, rather than improving yielding or oxidation resistance.
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