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← ScienceWhich mechanism reduces steel rebar strength during rapid heating?
A)Debonding of cementite phases occurs✓
B)Decreased covalent bonding overcomes lattice
C)Increased ionic character enables glide
D)Hydrogen embrittlement lowers yield strength
💡 Explanation
Debonding of cementite reduces steel strength, because at high temperatures, thermal stresses weaken the interfacial bonds between cementite and ferrite; therefore, fracture occurs, rather than plastic deformation because the interfaces fail under shear.
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