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Which risk increases when residual hydrogen permeates high-strength steel?

A)Grain boundary decohesion occurs
B)Rapid oxidation rate increases
C)Elastic modulus dramatically decreases
D)Thermal conductivity increases linearly

💡 Explanation

Hydrogen embrittlement weakens the steel by collecting at grain boundaries; therefore, grain boundary decohesion results in brittle fracture, because accumulated hydrogen induces stress at the grain boundaries, rather than increased oxidation or measurable changes in material properties.

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