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Which 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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