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← ScienceDuring steel casting, which mechanism embrittles solidified grain boundaries?
A)Hydrogen diffusion segregating to interfaces✓
B)Carbon precipitation creating Fe3C phases
C)Oxygen absorption forming oxide inclusions
D)Nitrogen dissolution strengthening the matrix
💡 Explanation
Hydrogen embrittlement occurs because hydrogen diffusion segregates to grain boundaries, weakening the interatomic bonds therefore reducing cohesion. Carbon precipitation affects bulk hardness rather than embrittling grain boundaries, and nitrogen strengthens materials, rather than weakening them.
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