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Which outcome occurs when hydrogen atoms migrate within the microstructure of high-strength steel bolts under tensile stress?

A)Hydrogen embrittlement fracture initiation
B)Increased yield strength from grain refinement
C)Improved corrosion resistance via passivation
D)Enhanced thread lubrication reducing friction

💡 Explanation

When hydrogen atoms diffuse to regions of high tensile stress aided by defects, hydrogen embrittlement occurs because hydrogen reduces the cohesive strength of the steel lattice, leading to brittle crack initiation and propagation. Therefore, hydrogen embrittlement leads to fracture, rather than strengthening, improving corrosion resistance, or lubrication, as those require different material processes.

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