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← ScienceWhich outcome results when the quench rate is insufficient in steel hardening?
A)Increased ductile-brittle transition hardness
B)Retained austenite becomes more unstable✓
C)Martensite transformation start temperature elevates
D)Reduced likelihood of creep deformation
💡 Explanation
Insufficient quench rate causes retained austenite because the diffusion-controlled transformation becomes incomplete; therefore, untransformed austenite remains, becoming unstable at room temperature, rather than transforming to martensite fully under rapid cooling.
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