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← ScienceWhich outcome occurs when rapid thermal cycling causes embrittlement?
A)Intergranular crack propagation rate increases✓
B)Dendritic growth impedes solidification uniformly
C)Austenite grain size decreases abruptly
D)Martensite transformation becomes fully reversible
💡 Explanation
Increased crack propagation occurs because thermal cycling induces fatigue; the mechanism being repeated 'Expansion and Contraction'. This concentrates stress at grain boundaries, therefore cracks propagate preferentially along these weakened interfaces rather than through the grains themselves.
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