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Which outcome results when subsurface hydrogen embrittlement occurs?

A)Catastrophic crack propagation is promoted
B)Oxide layers provide enhanced protection
C)Ductile fracture transitions to necking
D)Yield strength drastically increases overall

💡 Explanation

Hydrogen weakens metal grain boundaries and promotes brittle fracture. Hydrogen embrittlement causes crack propagation because interstitial hydrogen accumulates at crack tips, therefore promoting bond cleavage rather than crack blunting which requires energy dissipation elsewhere during plastic deformation.

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