Induction hardening is a metallurgical process of_____________________?
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Answer: A. hardening surface of workpiece to ob-tain hard and wear resistant surface
Explanation
Induction hardening uses electromagnetic induction to rapidly heat the surface layer of a steel workpiece. Subsequent rapid quenching transforms the heated outer surface into martensite to achieve high hardness. This process produces a hard, wear-resistant surface while retaining a tough, ductile core inside. Electromagnetic induction generates high frequency alternating currents that induce localized eddy currents in steel components. Heating depth is controlled precisely by adjusting the alternating current frequency applied to the induction coil. Medium and high carbon steels are well suited for induction hardening due to their ability to form martensite.
Automotive manufacturers use induction hardening to strengthen crankshaft journals, camshafts, and transmission gear teeth. Surface hardening extends the operational service life of mechanical components subjected to severe sliding wear. Induction hardening is favored in high volume production lines because it heats parts rapidly and cleanly. Option B describes general heat treatment quenching, whereas induction hardening specifically targets surface layers. Option C is incorrect because induction hardening hardens only the surface while keeping the core tough. Options D and E are inaccurate descriptions of the targeted surface heating and transformation mechanism.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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