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← ScienceWhich risk increases when dissolved hydrogen causes metal embrittlement?
A)Austenitic sensitization increases
B)Ductile fracture susceptibility rises✓
C)Oxidation rate accelerates
D)Creep resistance improves
💡 Explanation
Ductile fracture susceptibility increases because hydrogen embrittlement weakens grain boundaries via hydrogen diffusion, called the grain boundary decohesion mechanism. Therefore, fracture occurs at lower stress, rather than oxidation proceeding faster under normal conditions.
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