Which outcome occurs when austenite stainless steel is rapidly cooled from annealing temperature?

💡 Explanation

When austenite stainless steel is quenched, a diffusionless martensitic transformation occurs because rapid cooling suppresses the diffusion needed for equilibrium phase formation, resulting in a supersaturated solid solution. Therefore brittle martensite forms, rather than the other options which involve different mechanisms depending on composition, cooling rates, or temperature regime.

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