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Which outcome occurs when rapid hydrogen evolution surpasses diffusion rates in steel?

A)Accelerated stress corrosion cracking
B)Formation of iron oxides increases
C)Austenite transforms to martensite
D)Passivation layer becomes more stable

💡 Explanation

If hydrogen evolution exceeds diffusion, hydrogen embrittlement becomes likely because the concentration builds up at grain boundaries causing reduced cohesion; therefore stress corrosion cracking accelerates dramatically rather than surface oxidation or phase transformation occur.

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