Which outcome occurs during martensitic transformation in hardened steel alloy?

💡 Explanation

During martensitic transformation, involving diffusionless solid-state transition triggered by sudden cooling, the austenite lattice rearranges into a body-centered tetragonal martensite, increasing volume because atomic packing is less efficient. Therefore, volume expansion results, rather than increased ductility, reduced hardness, or phase segregation, which are driven by different metallurgical processes.

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