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← ScienceWhich 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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