Question:
Which coolant of the following is used in laser surface hardening?
Which coolant of the following is used in laser surface hardening?
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Laser hardening = Self-quenching. The cold interior of the metal does the cooling for you.
Updated On: Jul 4, 2026
- Water medium
- Oil medium
- No medium
- Lubricant medium
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Concept Laser surface hardening uses a high-energy laser beam to rapidly heat a localized surface area.
Step 2: Meaning Hardening requires a rapid cooling rate (quenching) to transform austenite into martensite.
Step 3: Analysis Because the laser heats only a thin surface layer very quickly, the cold bulk material underneath acts as a massive heat sink.
Step 4: Conclusion
This "self-quenching" effect occurs so rapidly through conduction into the core that no external cooling medium is required. Final Answer: (C)
Step 2: Meaning Hardening requires a rapid cooling rate (quenching) to transform austenite into martensite.
Step 3: Analysis Because the laser heats only a thin surface layer very quickly, the cold bulk material underneath acts as a massive heat sink.
Step 4: Conclusion
This "self-quenching" effect occurs so rapidly through conduction into the core that no external cooling medium is required. Final Answer: (C)
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