Q:
Which of following is not the feature of induction hardening?
Answer & Explanation
Answer: D) Applicable to carbon steels having (0.8– 1% C)
Explanation: The salient features of induction hardening are as follows:
• Heat the surface to a temperature above austenitic region
• Core does not get heated: the structure remains unaltered
• Surface converts to martensite on quenching.
• Fast heating & short hold time: needs higher austenization temperature
• Martensite forms in fine inhomogeneous grains of austenite
• Applicable to carbon steels (0.35 – 0.7C)
• Little distortion & good surface finish.
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