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← ScienceWhich condition precipitates accelerated austenite decomposition in weldments?
A)Insufficient carbon diffusion distance
B)Critical cooling rate exceeded✓
C)High interpass temperature maintained
D)Excessive hydrogen concentration present
💡 Explanation
Exceeding the critical cooling rate during welding bypasses equilibrium phase transformations promoting martensite; therefore the mechanical properties are altered because the rapid cooling suppresses diffusion rather than allowing equilibrium phases evolve.
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